diff --git a/build/org.eclipse.cdt.managedbuilder.ui/plugin.xml b/build/org.eclipse.cdt.managedbuilder.ui/plugin.xml
index ddc46803c2d..9443051f8a9 100644
--- a/build/org.eclipse.cdt.managedbuilder.ui/plugin.xml
+++ b/build/org.eclipse.cdt.managedbuilder.ui/plugin.xml
@@ -507,7 +507,7 @@
       </page>
       
       <!--page
-            class="org.eclipse.cdt.ui.newui.Page_ExpPathAndSymb"
+            class="org.eclipse.cdt.managedbuilder.ui.properties.Page_ExpPathAndSymb"
             id="org.eclipse.cdt.ui.newui.Page_ExpPathAndSymb"
             category="org.eclipse.cdt.ui.newui.Page_head_general"
             name="%CDTExpPathSymbolsProperty.name"
diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexProviderManagerTest.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexProviderManagerTest.java
index 368b7cb17e5..96f628ce7cf 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexProviderManagerTest.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexProviderManagerTest.java
@@ -38,10 +38,10 @@ import org.eclipse.cdt.core.settings.model.ICExternalSetting;
 import org.eclipse.cdt.core.settings.model.ICFileDescription;
 import org.eclipse.cdt.core.settings.model.ICFolderDescription;
 import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICProjectDescription;
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.core.settings.model.ICSettingContainer;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICSettingObject;
 import org.eclipse.cdt.core.settings.model.ICSourceEntry;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
@@ -340,7 +340,7 @@ class MockConfig implements ICConfigurationDescription {
 
 	public ICExternalSetting createExternalSetting(String[] languageIDs,
 			String[] contentTypeIds, String[] extensions,
-			ICLanguageSettingEntry[] entries) throws WriteAccessException {
+			ICSettingEntry[] entries) throws WriteAccessException {
 		return null;
 	}
 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACExclusionFilterEntry.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACExclusionFilterEntry.java
index 879acd95c77..76e644dae3b 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACExclusionFilterEntry.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACExclusionFilterEntry.java
@@ -79,7 +79,7 @@ public abstract class ACExclusionFilterEntry extends ACLanguageSettingPathEntry
 		return super.hashCode() + exclusionPatterns.hashCode();
 	}
 
-	public boolean equalsByContents(ICLanguageSettingEntry entry) {
+	public boolean equalsByContents(ICSettingEntry entry) {
 		if(!super.equalsByContents(entry))
 			return false;
 		
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACLanguageSettingEntry.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACLanguageSettingEntry.java
index b79ce34890d..882f3f7bd93 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACLanguageSettingEntry.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ACLanguageSettingEntry.java
@@ -76,7 +76,7 @@ public abstract class ACLanguageSettingEntry implements ICLanguageSettingEntry {
 		return fFlags;
 	}
 
-	public boolean equalsByContents(ICLanguageSettingEntry entry) {
+	public boolean equalsByContents(ICSettingEntry entry) {
 		return equalsByName(entry);
 	}
 	
@@ -84,7 +84,7 @@ public abstract class ACLanguageSettingEntry implements ICLanguageSettingEntry {
 		return (fFlags & (~ (BUILTIN | READONLY)));
 	}
 
-	public final boolean equalsByName(ICLanguageSettingEntry entry) {
+	public final boolean equalsByName(ICSettingEntry entry) {
 		if(entry == this)
 			return true;
 		
@@ -106,8 +106,12 @@ public abstract class ACLanguageSettingEntry implements ICLanguageSettingEntry {
 		return true;
 	}
 	
-	public int codeForNameKey(){
+	public final int codeForNameKey(){
 		return getKind() + getByNameMatchFlags() + fName.hashCode(); 
 	}
 	
+	public int codeForContentsKey(){
+		return codeForNameKey();
+	}
+	
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSetting.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CExternalSetting.java
similarity index 50%
rename from core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSetting.java
rename to core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CExternalSetting.java
index 2a347aed2b7..bdc3de505ef 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSetting.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CExternalSetting.java
@@ -8,54 +8,23 @@
  * Contributors:
  * Intel Corporation - Initial API and implementation
  *******************************************************************************/
-package org.eclipse.cdt.internal.core.settings.model;
+package org.eclipse.cdt.core.settings.model;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-import org.eclipse.cdt.core.settings.model.ICExternalSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
-import org.eclipse.cdt.core.settings.model.ICStorageElement;
 import org.eclipse.cdt.core.settings.model.util.CEntriesSet;
 import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
-import org.eclipse.cdt.core.settings.model.util.LanguageSettingEntriesSerializer;
-
-public class CExternalSetting implements ICExternalSetting {
-	static final String ELEMENT_SETTING_INFO = "externalSetting"; //$NON-NLS-1$
-//	private static final String ATTRIBUTE_ID = "id";
-	private static final String ATTRIBUTE_EXTENSIONS = "extensions"; //$NON-NLS-1$
-	private static final String ATTRIBUTE_CONTENT_TYPE_IDS = "contentTypes"; //$NON-NLS-1$
-	private static final String ATTRIBUTE_LANGUAGE_IDS = "languages"; //$NON-NLS-1$
-//	private static final String[] EMPTY_STRING_ARRAY = new String[0];
-	private static final String SEPARATOR = ":"; //$NON-NLS-1$
 
+public final class CExternalSetting implements ICExternalSetting {
 //	private EntryStore fEntryStore = new EntryStore();
-	private KindBasedStore fStore = new KindBasedStore();
+	private KindBasedStore fStore = new KindBasedStore(false);
 	private String[] fContentTypeIds;
 	private String[] fLanguageIds;
 	private String[] fExtensions;
 //	private String fId;
 
-	public CExternalSetting(ICStorageElement element){
-//		fId = element.getAttribute(ATTRIBUTE_ID);
-		String tmp = element.getAttribute(ATTRIBUTE_LANGUAGE_IDS);
-		if(tmp != null)
-			fLanguageIds = tmp.split(SEPARATOR);
-		
-		tmp = element.getAttribute(ATTRIBUTE_CONTENT_TYPE_IDS);
-		if(tmp != null)
-			fContentTypeIds = tmp.split(SEPARATOR);
-		
-		tmp = element.getAttribute(ATTRIBUTE_EXTENSIONS);
-		if(tmp != null)
-			fExtensions = tmp.split(ATTRIBUTE_EXTENSIONS);
-
-		List entriesList = LanguageSettingEntriesSerializer.loadEntriesList(element, KindBasedStore.ORED_LANG_ENTRY_KINDS);
-		ICLanguageSettingEntry[] entries = (ICLanguageSettingEntry[])entriesList.toArray(new ICLanguageSettingEntry[entriesList.size()]);
-		initEntryStore(entries);
-	}
-
 	public CExternalSetting(ICExternalSetting base){
 		fLanguageIds = base.getCompatibleLanguageIds();
 		fContentTypeIds = base.getCompatibleContentTypeIds();
@@ -65,7 +34,7 @@ public class CExternalSetting implements ICExternalSetting {
 		initEntryStore(base.getEntries());
 	}
 
-	public CExternalSetting(ICExternalSetting base, ICLanguageSettingEntry entries[]){
+	public CExternalSetting(ICExternalSetting base, ICSettingEntry entries[]){
 		this(base);
 		
 		initEntryStore(entries);
@@ -73,7 +42,7 @@ public class CExternalSetting implements ICExternalSetting {
 
 	public CExternalSetting(String[] languageIDs,
 			String[] contentTypeIds, String[] extensions,
-			ICLanguageSettingEntry[] entries){
+			ICSettingEntry[] entries){
 		if(languageIDs != null)
 			fLanguageIds = (String[])languageIDs.clone();
 		if(contentTypeIds != null)
@@ -84,8 +53,8 @@ public class CExternalSetting implements ICExternalSetting {
 		initEntryStore(entries);
 	}
 	
-	private void initEntryStore(ICLanguageSettingEntry entries[]){
-		ICLanguageSettingEntry entry;
+	private void initEntryStore(ICSettingEntry entries[]){
+		ICSettingEntry entry;
 		for(int i = 0; i < entries.length; i++){
 			entry = entries[i];
 			
@@ -95,7 +64,7 @@ public class CExternalSetting implements ICExternalSetting {
 //		trimToSize();
 	}
 	
-	private void addEntry(ICLanguageSettingEntry entry){
+	private void addEntry(ICSettingEntry entry){
 		getEntriesSet(entry.getKind(), true).addEntry(entry);
 	}
 	
@@ -135,18 +104,18 @@ public class CExternalSetting implements ICExternalSetting {
 		return null;
 	}
 
-	public ICLanguageSettingEntry[] getEntries(int kind) {
+	public ICSettingEntry[] getEntries(int kind) {
 		CEntriesSet set = getEntriesSet(kind, false);
 		if(set != null)
 			return set.toArray();
-		return new ICLanguageSettingEntry[0];
+		return new ICSettingEntry[0];
 	}
 
 //	public String getId(){
 //		return fId;
 //	}
 
-	public ICLanguageSettingEntry[] getEntries() {
+	public ICSettingEntry[] getEntries() {
 		List result = new ArrayList();
 		int kinds[] = KindBasedStore.getLanguageEntryKinds();
 		for(int i = 0; i < kinds.length; i++){
@@ -155,29 +124,6 @@ public class CExternalSetting implements ICExternalSetting {
 				result.addAll(Arrays.asList(list.toArray()));
 		}
 		
-		return (ICLanguageSettingEntry[])result.toArray(new ICLanguageSettingEntry[result.size()]);
-	}
-	
-	
-	private String composeString(String array[]){
-		StringBuffer buf = new StringBuffer(array[0]);
-		for(int i = 1; i < array.length; i++){
-			buf.append(SEPARATOR).append(array[i]);
-		}
-		return buf.toString();
-	}
-	
-	public void serialize(ICStorageElement el){
-		if(fLanguageIds != null && fLanguageIds.length != 0)
-			el.setAttribute(ATTRIBUTE_LANGUAGE_IDS, composeString(fLanguageIds));
-		
-		if(fContentTypeIds != null && fContentTypeIds.length != 0)
-			el.setAttribute(ATTRIBUTE_CONTENT_TYPE_IDS, composeString(fContentTypeIds));
-
-		
-		if(fExtensions != null && fExtensions.length != 0)
-			el.setAttribute(ATTRIBUTE_EXTENSIONS, composeString(fExtensions));
-
-		LanguageSettingEntriesSerializer.serializeEntries(getEntries(), el);
+		return (ICSettingEntry[])result.toArray(new ICSettingEntry[result.size()]);
 	}
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CMacroEntry.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CMacroEntry.java
index 9ae6daf0bb2..d6e6824a79a 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CMacroEntry.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/CMacroEntry.java
@@ -40,7 +40,7 @@ public final class CMacroEntry extends ACLanguageSettingEntry implements ICMacro
 		return super.hashCode() + fValue.hashCode();
 	}
 
-	public boolean equalsByContents(ICLanguageSettingEntry entry) {
+	public boolean equalsByContents(ICSettingEntry entry) {
 		if(!super.equalsByContents(entry))
 			return false;
 		
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICConfigurationDescription.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICConfigurationDescription.java
index 546dffa94ca..c0f09f9b464 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICConfigurationDescription.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICConfigurationDescription.java
@@ -263,7 +263,7 @@ public interface ICConfigurationDescription extends ICSettingContainer, ICSettin
 	ICExternalSetting createExternalSetting(String languageIDs[],
 			String contentTypeIds[],
 			String extensions[],
-			ICLanguageSettingEntry entries[]) throws WriteAccessException;
+			ICSettingEntry entries[]) throws WriteAccessException;
 
 	/**
 	 * removes external setting from this configuration 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICExternalSetting.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICExternalSetting.java
index aef92dfc5ce..a44c4a80de7 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICExternalSetting.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICExternalSetting.java
@@ -17,7 +17,7 @@ public interface ICExternalSetting {
 	
 	String[] getCompatibleExtensions();
 	
-	ICLanguageSettingEntry[] getEntries(int kind);
+	ICSettingEntry[] getEntries(int kind);
 
-	ICLanguageSettingEntry[] getEntries();
+	ICSettingEntry[] getEntries();
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICSettingEntry.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICSettingEntry.java
index 274f66a4f30..d1a7365b33a 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICSettingEntry.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICSettingEntry.java
@@ -39,9 +39,9 @@ public interface ICSettingEntry {
 	
 	boolean isResolved();
 	
-	boolean equalsByName(ICLanguageSettingEntry entry);
+	boolean equalsByName(ICSettingEntry entry);
 
-	boolean equalsByContents(ICLanguageSettingEntry entry);
+	boolean equalsByContents(ICSettingEntry entry);
 
 	int getFlags();
 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/extension/CExternalSettingProvider.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/extension/CExternalSettingProvider.java
new file mode 100644
index 00000000000..b5b3540b1a7
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/extension/CExternalSettingProvider.java
@@ -0,0 +1,19 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.core.settings.model.extension;
+
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.core.resources.IProject;
+
+public abstract class CExternalSettingProvider {
+	public abstract CExternalSetting[] getSettings(IProject project, ICConfigurationDescription cfg);
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CDataUtil.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CDataUtil.java
index 02bf91aa7fe..1b68a4339cd 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CDataUtil.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CDataUtil.java
@@ -704,4 +704,27 @@ public class CDataUtil {
 			}
 		}
 	}
+	
+	public static Map fillEntriesMapByNameKey(Map map, ICSettingEntry[] entries){
+		if(map == null)
+			map = new LinkedHashMap();
+		
+		for(int i = 0; i < entries.length; i++){
+			ICSettingEntry entry = entries[i];
+			map.put(new EntryNameKey(entry), entry);
+		}
+		return map;
+	}
+
+	public static Map fillEntriesMapByContentsKey(Map map, ICSettingEntry[] entries){
+		if(map == null)
+			map = new LinkedHashMap();
+		
+		for(int i = 0; i < entries.length; i++){
+			ICSettingEntry entry = entries[i];
+			map.put(new EntryContentsKey(entry), entry);
+		}
+		return map;
+	}
+
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CEntriesSet.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CEntriesSet.java
index 0a47af8f568..f8539fbeac2 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CEntriesSet.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/CEntriesSet.java
@@ -14,7 +14,7 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 
 public class CEntriesSet {
 	private HashMap fEntriesMap = new HashMap();
@@ -26,7 +26,7 @@ public class CEntriesSet {
 		setEntries(list);
 	}
 
-	public CEntriesSet(ICLanguageSettingEntry entries[]){
+	public CEntriesSet(ICSettingEntry entries[]){
 		setEntries(entries);
 	}
 
@@ -41,16 +41,16 @@ public class CEntriesSet {
 		return entry;
 	}
 */
-	public ICLanguageSettingEntry[] toArray() {
-		return (ICLanguageSettingEntry[])fEntriesMap.values().toArray(new ICLanguageSettingEntry[fEntriesMap.size()]);
+	public ICSettingEntry[] toArray() {
+		return (ICSettingEntry[])fEntriesMap.values().toArray(new ICSettingEntry[fEntriesMap.size()]);
 	}
 	
-	protected Object getKey(ICLanguageSettingEntry entry){
+	protected Object getKey(ICSettingEntry entry){
 		return entry;
 	}
 	
-	public ICLanguageSettingEntry addEntry(ICLanguageSettingEntry entry) {
-		return (ICLanguageSettingEntry)fEntriesMap.put(getKey(entry), entry);
+	public ICSettingEntry addEntry(ICSettingEntry entry) {
+		return (ICSettingEntry)fEntriesMap.put(getKey(entry), entry);
 	}
 
 	public void clear() {
@@ -61,17 +61,17 @@ public class CEntriesSet {
 		clear();
 		for(Iterator iter = list.iterator(); iter.hasNext();){
 			Object obj = iter.next();
-			if(obj instanceof ICLanguageSettingEntry){
-				ICLanguageSettingEntry entry = (ICLanguageSettingEntry)obj;
+			if(obj instanceof ICSettingEntry){
+				ICSettingEntry entry = (ICSettingEntry)obj;
 				addEntry(entry);
 			}
 		}
 	}
 
-	public void setEntries(ICLanguageSettingEntry[] entries) {
+	public void setEntries(ICSettingEntry[] entries) {
 		clear();
 		for(int i = 0; i < entries.length; i++){
-			ICLanguageSettingEntry entry = entries[i];
+			ICSettingEntry entry = entries[i];
 			if(entry != null){
 				addEntry(entry);
 			}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryContentsKey.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryContentsKey.java
new file mode 100644
index 00000000000..b30ea0e6761
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryContentsKey.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.core.settings.model.util;
+
+import org.eclipse.cdt.core.settings.model.ACLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
+
+public class EntryContentsKey {
+	ICSettingEntry fEntry;
+	
+	public EntryContentsKey(ICSettingEntry entry){
+		fEntry = entry;
+	}
+
+	public boolean equals(Object obj) {
+		if(this == obj)
+			return true;
+		
+		if(!(obj instanceof EntryContentsKey))
+			return false;
+		return fEntry.equalsByContents(((EntryContentsKey)obj).fEntry);
+	}
+
+	public int hashCode() {
+		return ((ACLanguageSettingEntry)fEntry).codeForContentsKey();
+	}
+		
+	public ICSettingEntry getEntry(){
+		return fEntry;
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryNameKey.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryNameKey.java
index c6ec71df989..955e065be28 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryNameKey.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/EntryNameKey.java
@@ -11,29 +11,29 @@
 package org.eclipse.cdt.core.settings.model.util;
 
 import org.eclipse.cdt.core.settings.model.ACLanguageSettingEntry;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 
 public class EntryNameKey {
-	ICLanguageSettingEntry fEntry;
+	ICSettingEntry fEntry;
 		
-		public EntryNameKey(ICLanguageSettingEntry entry){
-			fEntry = entry;
-		}
+	public EntryNameKey(ICSettingEntry entry){
+		fEntry = entry;
+	}
 
-		public boolean equals(Object obj) {
-			if(this == obj)
-				return true;
-			
-			if(!(obj instanceof EntryNameKey))
-				return false;
-			return fEntry.equalsByName(((EntryNameKey)obj).fEntry);
-		}
-
-		public int hashCode() {
-			return ((ACLanguageSettingEntry)fEntry).codeForNameKey();
-		}
+	public boolean equals(Object obj) {
+		if(this == obj)
+			return true;
 		
-		public ICLanguageSettingEntry getEntry(){
-			return fEntry;
-		}
+		if(!(obj instanceof EntryNameKey))
+			return false;
+		return fEntry.equalsByName(((EntryNameKey)obj).fEntry);
+	}
+
+	public int hashCode() {
+		return ((ACLanguageSettingEntry)fEntry).codeForNameKey();
+	}
+		
+	public ICSettingEntry getEntry(){
+		return fEntry;
+	}
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/KindBasedStore.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/KindBasedStore.java
index 0f39ba73922..1dbb454eda8 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/KindBasedStore.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/KindBasedStore.java
@@ -44,6 +44,17 @@ public class KindBasedStore implements Cloneable {
 		ICLanguageSettingEntry.LIBRARY_FILE,
 	};
 
+	private static final int ALL_ENTRY_KINDS[] = new int[]{
+		ICLanguageSettingEntry.INCLUDE_PATH,
+		ICLanguageSettingEntry.INCLUDE_FILE,
+		ICLanguageSettingEntry.MACRO,
+		ICLanguageSettingEntry.MACRO_FILE,
+		ICLanguageSettingEntry.LIBRARY_PATH,
+		ICLanguageSettingEntry.LIBRARY_FILE,
+		ICLanguageSettingEntry.SOURCE_PATH,
+		ICLanguageSettingEntry.OUTPUT_PATH,
+	};
+
 //	private static final int INEXISTENT_INDEX = -1;
 	
 	private Object[] fEntryStorage;
@@ -89,6 +100,10 @@ public class KindBasedStore implements Cloneable {
 		return (int[])LANG_ENTRY_KINDS.clone();
 	}
 
+	public static int[] getAllEntryKinds(){
+		return (int[])ALL_ENTRY_KINDS.clone();
+	}
+
 	private int indexToKind(int index){
 		switch (index){
 		case INDEX_INCLUDE_PATH:
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/PathEntryTranslator.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/PathEntryTranslator.java
index 82f84a635b4..5ff6f3053b3 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/PathEntryTranslator.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/util/PathEntryTranslator.java
@@ -37,6 +37,7 @@ import org.eclipse.cdt.core.model.IMacroFileEntry;
 import org.eclipse.cdt.core.model.IPathEntry;
 import org.eclipse.cdt.core.model.ISourceEntry;
 import org.eclipse.cdt.core.resources.IPathEntryVariableManager;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
 import org.eclipse.cdt.core.settings.model.CIncludeFileEntry;
 import org.eclipse.cdt.core.settings.model.CIncludePathEntry;
 import org.eclipse.cdt.core.settings.model.CLibraryFileEntry;
@@ -68,7 +69,6 @@ import org.eclipse.cdt.internal.core.model.APathEntry;
 import org.eclipse.cdt.internal.core.model.CModelStatus;
 import org.eclipse.cdt.internal.core.model.PathEntry;
 import org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache;
-import org.eclipse.cdt.internal.core.settings.model.CExternalSetting;
 import org.eclipse.cdt.internal.core.settings.model.IInternalCCfgInfo;
 import org.eclipse.cdt.utils.cdtvariables.CdtVariableResolver;
 import org.eclipse.core.resources.IContainer;
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescription.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescription.java
index 4b4ad4b6f04..92755a54b02 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescription.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescription.java
@@ -24,10 +24,10 @@ import org.eclipse.cdt.core.settings.model.ICExternalSetting;
 import org.eclipse.cdt.core.settings.model.ICFileDescription;
 import org.eclipse.cdt.core.settings.model.ICFolderDescription;
 import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICProjectDescription;
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.core.settings.model.ICSettingBase;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICSourceEntry;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
 import org.eclipse.cdt.core.settings.model.ICTargetPlatformSetting;
@@ -632,14 +632,15 @@ public class CConfigurationDescription extends CDataProxyContainer implements IC
 
 	public void setReferenceInfo(Map refs) {
 		try {
-			ExternalSettingsManager.getInstance().updateReferenceInfo(this, refs);
+			CConfigurationSpecSettings specs = getSpecSettings();
+			specs.setReferenceInfo(refs);
 		} catch (CoreException e) {
 		}
 	}
 
 	public ICExternalSetting createExternalSetting(String[] languageIDs,
 			String[] contentTypeIDs, String[] extensions,
-			ICLanguageSettingEntry[] entries) {
+			ICSettingEntry[] entries) {
 		try {
 			return getSpecSettings().createExternalSetting(languageIDs, contentTypeIDs, extensions, entries);
 		} catch (CoreException e) {
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescriptionCache.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescriptionCache.java
index 18757363990..ddced96f8ad 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescriptionCache.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationDescriptionCache.java
@@ -23,11 +23,11 @@ import org.eclipse.cdt.core.settings.model.ICExternalSetting;
 import org.eclipse.cdt.core.settings.model.ICFileDescription;
 import org.eclipse.cdt.core.settings.model.ICFolderDescription;
 import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICProjectDescription;
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.core.settings.model.ICSettingBase;
 import org.eclipse.cdt.core.settings.model.ICSettingContainer;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICSettingObject;
 import org.eclipse.cdt.core.settings.model.ICSourceEntry;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
@@ -377,7 +377,7 @@ public class CConfigurationDescriptionCache extends CDefaultConfigurationData
 
 	public ICExternalSetting createExternalSetting(String[] languageIDs,
 			String[] contentTypeIds, String[] extensions,
-			ICLanguageSettingEntry[] entries) {
+			ICSettingEntry[] entries) {
 		if(!fInitializing)
 			throw ExceptionFactory.createIsReadOnlyException();
 		
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
index 12ec718d7fd..fcb48302b8e 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
@@ -19,11 +19,12 @@ import java.util.Set;
 import java.util.Map.Entry;
 
 import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
 import org.eclipse.cdt.core.settings.model.ICBuildSetting;
 import org.eclipse.cdt.core.settings.model.ICConfigExtensionReference;
 import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
 import org.eclipse.cdt.core.settings.model.ICExternalSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICSettingsStorage;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
 import org.eclipse.cdt.core.settings.model.ICTargetPlatformSetting;
@@ -40,7 +41,7 @@ import org.eclipse.core.runtime.QualifiedName;
 
 public class CConfigurationSpecSettings implements ICSettingsStorage{
 	static final String BUILD_SYSTEM_ID = "buildSystemId";	//$NON-NLS-1$
-	private final static String ELEMENT_REFERENCES = "references";  //$NON-NLS-1$
+//	private final static String ELEMENT_REFERENCES = "references";  //$NON-NLS-1$
 	private static final String PROJECT_EXTENSION_ATTR_POINT = "point"; //$NON-NLS-1$
 	private static final String PROJECT_EXTENSION_ATTR_ID = "id"; //$NON-NLS-1$
 	private static final String PROJECT_EXTENSION_ATTRIBUTE = "attribute"; //$NON-NLS-1$
@@ -65,8 +66,9 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 	private String fId;
 	private StorableCdtVariables fMacros;
 	private StorableEnvironment fEnvironment;
-	private HashMap fRefInfoMap;
-	private CExternalSettingProvider fExtSettingsProvider = new CExternalSettingProvider();
+//	private HashMap fRefInfoMap;
+	private Map fRefMapCache;
+	private CExternalSettingsHolder fExtSettingsProvider = new CExternalSettingsHolder();
 	private boolean fIsModified;
 	private HashMap fSessionPropertiesMap;
 	private HashMap fExtMap;
@@ -94,10 +96,10 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 			
 			if(StorableCdtVariables.MACROS_ELEMENT_NAME.equals(name)){
 				fMacros = new StorableCdtVariables(child, fCfg.isReadOnly());
-			} else if(ELEMENT_REFERENCES.equals(name)){
+			}/* else if(ELEMENT_REFERENCES.equals(name)){
 				loadReferences(child);
-			} else if (CExternalSettingProvider.ELEMENT_EXT_SETTINGS_CONTAINER.equals(name)){
-				fExtSettingsProvider = new CExternalSettingProvider(child);
+			} */else if (CExternalSettingsHolder.ELEMENT_EXT_SETTINGS_CONTAINER.equals(name)){
+				fExtSettingsProvider = new CExternalSettingsHolder(child);
 			} else if(StorableEnvironment.ENVIRONMENT_ELEMENT_NAME.equals(name)){
 				fEnvironment = new StorableEnvironment(child, fCfg.isReadOnly());
 			} else if(PROJECT_EXTENSIONS.equals(name)){
@@ -134,13 +136,13 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 		fName = base.fName;
 		fId = base.fId;
 		
-		copyRefInfos(base.fRefInfoMap);
+//		copyRefInfos(base.fRefInfoMap);
 		
 		if(base.fMacros != null)
 			fMacros = new StorableCdtVariables(base.fMacros, des.isReadOnly());
 		
 		if(base.fExtSettingsProvider != null)
-			fExtSettingsProvider = new CExternalSettingProvider(base.fExtSettingsProvider);
+			fExtSettingsProvider = new CExternalSettingsHolder(base.fExtSettingsProvider);
 		
 		if(base.fSessionPropertiesMap != null)
 			fSessionPropertiesMap = (HashMap)base.fSessionPropertiesMap.clone();
@@ -154,20 +156,20 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 		copyExtensionInfo(base);
 	}
 	
-	private void copyRefInfos(Map infosMap){
-		if(infosMap == null || infosMap.size() == 0){
-			fRefInfoMap = null;
-			return;
-		}
-		
-		fRefInfoMap = new HashMap(infosMap.size());
-		for(Iterator iter = infosMap.entrySet().iterator(); iter.hasNext();){
-			Map.Entry entry = (Map.Entry)iter.next();
-			String projName = (String)entry.getKey();
-			ProjectRefInfo info = (ProjectRefInfo)entry.getValue();
-			fRefInfoMap.put(projName, new ProjectRefInfo(info));
-		}
-	}
+//	private void copyRefInfos(Map infosMap){
+//		if(infosMap == null || infosMap.size() == 0){
+//			fRefInfoMap = null;
+//			return;
+//		}
+//		
+//		fRefInfoMap = new HashMap(infosMap.size());
+//		for(Iterator iter = infosMap.entrySet().iterator(); iter.hasNext();){
+//			Map.Entry entry = (Map.Entry)iter.next();
+//			String projName = (String)entry.getKey();
+//			ProjectRefInfo info = (ProjectRefInfo)entry.getValue();
+//			fRefInfoMap.put(projName, new ProjectRefInfo(info));
+//		}
+//	}
 	
 	public void setCOwner(String ownerId) throws CoreException{
 		if(ownerId == null)
@@ -181,23 +183,23 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 		fOwner = new COwner(cfg);
 	}
 	
-	private void loadReferences(ICStorageElement el){
-		fRefInfoMap = new HashMap();
-		ICStorageElement children[] = el.getChildren();
-		
-		for(int i = 0; i < children.length; i++){
-			ICStorageElement child = children[i];
-			String name = child.getName();
-
-			if(ProjectRefInfo.ELEMENT_REFERENCE.equals(name)){
-				ProjectRefInfo info = new ProjectRefInfo(child);
-				fRefInfoMap.put(info.getProjectName(), info);
-			}
-		}
-		
-		if(fRefInfoMap.size() == 0)
-			fRefInfoMap = null;
-	}
+//	private void loadReferences(ICStorageElement el){
+//		fRefInfoMap = new HashMap();
+//		ICStorageElement children[] = el.getChildren();
+//		
+//		for(int i = 0; i < children.length; i++){
+//			ICStorageElement child = children[i];
+//			String name = child.getName();
+//
+//			if(ProjectRefInfo.ELEMENT_REFERENCE.equals(name)){
+//				ProjectRefInfo info = new ProjectRefInfo(child);
+//				fRefInfoMap.put(info.getProjectName(), info);
+//			}
+//		}
+//		
+//		if(fRefInfoMap.size() == 0)
+//			fRefInfoMap = null;
+//	}
 	
 //	 private Map normalizeRefs(Map ref){
 //			for(Iterator iter = ref.entrySet().iterator(); iter.hasNext();){
@@ -333,18 +335,18 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 		}
 		
 		if(fExtSettingsProvider != null){
-			ICStorageElement child = settings.createChild(CExternalSettingProvider.ELEMENT_EXT_SETTINGS_CONTAINER);
+			ICStorageElement child = settings.createChild(CExternalSettingsHolder.ELEMENT_EXT_SETTINGS_CONTAINER);
 			fExtSettingsProvider.serialize(child);
 		}
 		
-		if(fRefInfoMap != null && fRefInfoMap.size() != 0){
-			ICStorageElement el = settings.createChild(ELEMENT_REFERENCES);
-			for(Iterator iter = fRefInfoMap.values().iterator(); iter.hasNext();){
-				ProjectRefInfo info = (ProjectRefInfo)iter.next();
-				ICStorageElement child = el.createChild(ProjectRefInfo.ELEMENT_REFERENCE);
-				info.serialize(child);
-			}
-		}
+//		if(fRefInfoMap != null && fRefInfoMap.size() != 0){
+//			ICStorageElement el = settings.createChild(ELEMENT_REFERENCES);
+//			for(Iterator iter = fRefInfoMap.values().iterator(); iter.hasNext();){
+//				ProjectRefInfo info = (ProjectRefInfo)iter.next();
+//				ICStorageElement child = el.createChild(ProjectRefInfo.ELEMENT_REFERENCE);
+//				info.serialize(child);
+//			}
+//		}
 		
 		ICStorageElement extEl = settings.createChild(PROJECT_EXTENSIONS);
 		encodeProjectExtensions(extEl);
@@ -369,50 +371,57 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 	}
 	
 	public Map getReferenceInfo(){
-		if(fRefInfoMap == null || fRefInfoMap.size() == 0)
-			return new HashMap(0);
-		
-		Map map = (HashMap)fRefInfoMap.clone();
-		for(Iterator iter = map.entrySet().iterator(); iter.hasNext();){
-			Map.Entry entry = (Map.Entry)iter.next();
-			ProjectRefInfo info = (ProjectRefInfo)entry.getValue();
-			entry.setValue(info.getCfgId());
-		}
-		return map;
+		if(!fCfg.isReadOnly())
+			return CfgExportSettingContainerFactory.getReferenceMap(fCfg);
+		if(fRefMapCache == null)
+			fRefMapCache = CfgExportSettingContainerFactory.getReferenceMap(fCfg);
+		return fRefMapCache;
+//		if(fRefInfoMap == null || fRefInfoMap.size() == 0)
+//			return new HashMap(0);
+//		
+//		Map map = (HashMap)fRefInfoMap.clone();
+//		for(Iterator iter = map.entrySet().iterator(); iter.hasNext();){
+//			Map.Entry entry = (Map.Entry)iter.next();
+//			ProjectRefInfo info = (ProjectRefInfo)entry.getValue();
+//			entry.setValue(info.getCfgId());
+//		}
+//		return map;
 	}
 	
-	public Map getProjectRefInfoMap(){
-		if(fRefInfoMap == null || fRefInfoMap.size() == 0)
-			return new HashMap(0);
-		
-		return (Map)fRefInfoMap.clone();
-	}
+//	public Map getProjectRefInfoMap(){
+//		if(fRefInfoMap == null || fRefInfoMap.size() == 0)
+//			return new HashMap(0);
+//		
+//		return (Map)fRefInfoMap.clone();
+//	}
 	
-	public void setProjectRefInfoMap(Map map){
-		if(map == null && map.size() == 0)
-			fRefInfoMap = null;
-		
-		fRefInfoMap = new HashMap(map);
-		fIsModified = true;
+//	public void setProjectRefInfoMap(Map map){
+//		if(map == null && map.size() == 0)
+//			fRefInfoMap = null;
+//		
+//		fRefInfoMap = new HashMap(map);
+//		fIsModified = true;
+//	}
+
+	public void setReferenceInfo(Map ref){
+		fRefMapCache = null;
+		CfgExportSettingContainerFactory.setReferenceMap(fCfg, ref);
+//		if(isReadOnly())
+//			throw ExceptionFactory.createIsReadOnlyException();
+//
+//		List removed = null, added = null;
+//		if(fRefInfos != null){
+//			for(int i = 0; i < fRefInfos.length; i++){
+//				String cfgId
+//			}
+//		}
+//		if(ref != null && CProjectDescriptionManager.getInstance().normalizeRefs(ref).size() != 0){
+//			fReferenceInfo = new HashMap(ref);
+//		} else {
+//			fReferenceInfo = null;
+//		}
 	}
 
-/*	public void setReferenceInfo(Map ref){
-		if(isReadOnly())
-			throw ExceptionFactory.createIsReadOnlyException();
-
-		List removed = null, added = null;
-		if(fRefInfos != null){
-			for(int i = 0; i < fRefInfos.length; i++){
-				String cfgId
-			}
-		}
-		if(ref != null && CProjectDescriptionManager.getInstance().normalizeRefs(ref).size() != 0){
-			fReferenceInfo = new HashMap(ref);
-		} else {
-			fReferenceInfo = null;
-		}
-	}
-*/
 /*	
 	private Map getExternalSettingsProviderMap(boolean create){
 		if(fExternalSettingsProviderMap == null && create)
@@ -437,12 +446,12 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 	
 	public ICExternalSetting createExternalSetting(String[] languageIDs,
 			String[] contentTypeIDs, String[] extensions,
-			ICLanguageSettingEntry[] entries) {
+			ICSettingEntry[] entries) {
 		return fExtSettingsProvider.createExternalSetting(languageIDs, contentTypeIDs, extensions, entries);
 	}
 
 	public void removeExternalSetting(ICExternalSetting setting) {
-		fExtSettingsProvider.removeExternalSetting(setting);
+		fExtSettingsProvider.removeExternalSetting((CExternalSetting)setting);
 	}
 
 	public void removeExternalSettings() {
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingChangeEvent.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingChangeEvent.java
new file mode 100644
index 00000000000..13028d3dd13
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingChangeEvent.java
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+class CExternalSettingChangeEvent {
+	private List fChangeInfoList = new ArrayList();
+
+	CExternalSettingChangeEvent(CExternalSettingsContainerChangeInfo[] infos){
+		fChangeInfoList.addAll(Arrays.asList(infos));
+	}
+	
+//	void add(CExternalSettingsContainerChangeInfo info){
+//		fChangeInfoList.add(info);
+//	}
+	
+	public CExternalSettingsContainerChangeInfo[] getChangeInfos(){
+		return (CExternalSettingsContainerChangeInfo[])fChangeInfoList.toArray(
+				new CExternalSettingsContainerChangeInfo[fChangeInfoList.size()]);
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingContainerFactory.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingContainerFactory.java
new file mode 100644
index 00000000000..2b18dcb15a1
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingContainerFactory.java
@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.runtime.CoreException;
+
+public abstract class CExternalSettingContainerFactory {
+	
+	public abstract CExternalSettingsContainer createContainer(
+			String id,
+			IProject project,
+			ICConfigurationDescription cfgDes) throws CoreException;
+
+	public void addListener(ICExternalSettingsListener listener){
+	}
+	
+	public void removeListener(ICExternalSettingsListener listener){
+	}
+
+	public void startup(){
+	}
+	
+	public void shutdown(){
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingSerializer.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingSerializer.java
new file mode 100644
index 00000000000..6b75778628d
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingSerializer.java
@@ -0,0 +1,68 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.List;
+
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICStorageElement;
+import org.eclipse.cdt.core.settings.model.util.CDataUtil;
+import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
+import org.eclipse.cdt.core.settings.model.util.LanguageSettingEntriesSerializer;
+
+public class CExternalSettingSerializer {
+	static final String ELEMENT_SETTING_INFO = "externalSetting"; //$NON-NLS-1$
+//	private static final String ATTRIBUTE_ID = "id";
+	private static final String ATTRIBUTE_EXTENSIONS = "extensions"; //$NON-NLS-1$
+	private static final String ATTRIBUTE_CONTENT_TYPE_IDS = "contentTypes"; //$NON-NLS-1$
+	private static final String ATTRIBUTE_LANGUAGE_IDS = "languages"; //$NON-NLS-1$
+//	private static final String[] EMPTY_STRING_ARRAY = new String[0];
+	private static final String SEPARATOR = ":"; //$NON-NLS-1$
+
+	public static CExternalSetting load(ICStorageElement element){
+		String langIds[] = null;
+		String cTypeIds[] = null;
+		String exts[] = null;
+		String tmp = element.getAttribute(ATTRIBUTE_LANGUAGE_IDS);
+		if(tmp != null)
+			langIds = CDataUtil.stringToArray(tmp, SEPARATOR);
+		
+		tmp = element.getAttribute(ATTRIBUTE_CONTENT_TYPE_IDS);
+		if(tmp != null )
+			cTypeIds = CDataUtil.stringToArray(tmp, SEPARATOR);
+		
+		tmp = element.getAttribute(ATTRIBUTE_EXTENSIONS);
+		if(tmp != null)
+			exts = CDataUtil.stringToArray(tmp, SEPARATOR);
+
+		List entriesList = LanguageSettingEntriesSerializer.loadEntriesList(element, KindBasedStore.ORED_LANG_ENTRY_KINDS);
+		ICSettingEntry[] entries = (ICSettingEntry[])entriesList.toArray(new ICSettingEntry[entriesList.size()]);
+		return new CExternalSetting(langIds, cTypeIds, exts, entries);
+	}
+	
+	public static void store(CExternalSetting setting, ICStorageElement el){
+		String[] tmp;
+		tmp = setting.getCompatibleLanguageIds(); 
+		if(tmp != null)
+			el.setAttribute(ATTRIBUTE_LANGUAGE_IDS, CDataUtil.arrayToString(tmp, SEPARATOR));
+		
+		tmp = setting.getCompatibleContentTypeIds();
+		if(tmp != null)
+			el.setAttribute(ATTRIBUTE_CONTENT_TYPE_IDS, CDataUtil.arrayToString(tmp, SEPARATOR));
+
+		tmp = setting.getCompatibleExtensions();
+		if(tmp != null)
+			el.setAttribute(ATTRIBUTE_EXTENSIONS, CDataUtil.arrayToString(tmp, SEPARATOR));
+
+		LanguageSettingEntriesSerializer.serializeEntries(setting.getEntries(), el);
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainer.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainer.java
new file mode 100644
index 00000000000..889d1288db4
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainer.java
@@ -0,0 +1,20 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+
+
+public abstract class CExternalSettingsContainer {
+
+	public abstract CExternalSetting[] getExternalSettings();
+	
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainerChangeInfo.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainerChangeInfo.java
new file mode 100644
index 00000000000..6434ea63da0
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsContainerChangeInfo.java
@@ -0,0 +1,75 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.CContainerRef;
+
+public class CExternalSettingsContainerChangeInfo {
+	public static final int CHANGED = 1;
+	
+	public static final int CONTAINED_ID = 1;
+	public static final int CONTAINER_CONTENTS = 1 << 1;
+
+	private int fFlags;
+	private	String fOldId;
+	private CContainerRef fCRef;
+//	private Map fIncludeMap, fExcludeMap;
+	
+//	private class ProjChangeInfo {
+//		private String fProjName;
+//		private Set fCfgIds;
+//	}
+//	private CExternalSettingsContainer fContainer;
+//	private ExtSettingsDelta[] fDeltas;
+	
+	CExternalSettingsContainerChangeInfo(int flags, 
+			CContainerRef cr, 
+//			CExternalSettingsContainer container, 
+			String oldId/*,
+			ExtSettingsDelta[] deltas*/
+			){
+		this.fFlags = flags;
+		this.fCRef = cr;
+//		this.fContainer = container;
+		this.fOldId = oldId;
+//		this.fIncludeMap = includeMap;
+//		this.fExcludeMap = exludeMap;
+//		this.fDeltas = deltas;
+	}
+	
+	public int getEventType(){
+		return CHANGED;
+	}
+	
+	public int getChangeFlags(){
+		return fFlags;
+	}
+	
+//	public CExternalSettingsContainer getContainer(){
+//		return fContainer;
+//	}
+	
+//	public ExtSettingsDelta[] getDeltas(){
+//		return fDeltas;
+//	}
+	
+	public String getOldId(){
+		return fOldId;
+	}
+	
+	public String getNewId(){
+		return fCRef.getContainerId();
+	}
+	
+	public CContainerRef getContainerInfo(){
+		return fCRef;
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsDeltaProcessor.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsDeltaProcessor.java
new file mode 100644
index 00000000000..25a49600b18
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsDeltaProcessor.java
@@ -0,0 +1,170 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.cdt.core.settings.model.ICFileDescription;
+import org.eclipse.cdt.core.settings.model.ICFolderDescription;
+import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
+import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+import org.eclipse.cdt.core.settings.model.ICSettingBase;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
+import org.eclipse.cdt.core.settings.model.util.CDataUtil;
+import org.eclipse.cdt.core.settings.model.util.EntryContentsKey;
+import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettinsDeltaCalculator.ExtSettingsDelta;
+
+public class CExternalSettingsDeltaProcessor {
+	static void applyDelta(ICConfigurationDescription des, ExtSettingsDelta deltas[]){
+		ICResourceDescription rcDess[] = des.getResourceDescriptions();
+		for(int i = 0; i < rcDess.length; i++){
+			ICResourceDescription rcDes = rcDess[i];
+			if(rcDes.getType() == ICSettingBase.SETTING_FOLDER){
+				applyDelta((ICFolderDescription)rcDes, deltas);
+			} else {
+				applyDelta((ICFileDescription)rcDes, deltas);
+			}
+		}
+	}
+	
+	private static void applyDelta(ICFileDescription des, ExtSettingsDelta deltas[]){
+		ICLanguageSetting setting = des.getLanguageSetting();
+		if(setting == null)
+			return;
+		for(int i = 0; i < deltas.length; i++){
+			if(isSettingCompatible(setting, deltas[i].fSetting)){
+				applyDelta(setting, deltas[i]);
+			}
+		}
+	}
+
+	private static void applyDelta(ICFolderDescription des, ExtSettingsDelta deltas[]){
+		ICLanguageSetting settings[] = des.getLanguageSettings();
+		if(settings == null || settings.length == 0)
+			return;
+		
+		ICLanguageSetting setting;
+		for(int k = 0; k < settings.length; k++){
+			setting = settings[k];
+			for(int i = 0; i < deltas.length; i++){
+				if(isSettingCompatible(setting, deltas[i].fSetting)){
+					applyDelta(setting, deltas[i]);
+				}
+			}
+		}
+	}
+
+	private static void applyDelta(ICLanguageSetting setting, ExtSettingsDelta delta){
+		int kinds[] = KindBasedStore.getLanguageEntryKinds();
+		int kind;
+		ICLanguageSettingEntry entries[];
+		ICSettingEntry diff[][];
+		for(int i = 0; i < kinds.length; i++){
+			kind = kinds[i];
+			diff = delta.getEntriesDelta(kind);
+			if(diff == null)
+				continue;
+			
+			entries = setting.getSettingEntries(kind);
+			List list = calculateUpdatedEntries(entries, diff[0], diff[1]);
+			
+			if(list != null)
+				setting.setSettingEntries(kind, list);
+		}
+	}
+	
+	private static List calculateUpdatedEntries(ICSettingEntry current[], ICSettingEntry added[], ICSettingEntry removed[]){
+		LinkedHashMap map = new LinkedHashMap();
+		boolean changed = false;
+		if(added != null){
+			CDataUtil.fillEntriesMapByContentsKey(map, added);
+		}
+		if(current != null){
+			CDataUtil.fillEntriesMapByContentsKey(map, current);
+			if(current.length != map.size()){
+				changed = true;
+			}
+		} else {
+			if(map.size() != 0){
+				changed = true;
+			}
+		}
+		if(removed != null){
+			for(int i = 0; i < removed.length; i++){
+				ICSettingEntry entry = removed[i];
+				EntryContentsKey cKey = new EntryContentsKey(entry);
+				ICSettingEntry cur = (ICSettingEntry)map.get(cKey);
+				if(cur != null && !cur.isBuiltIn()){
+					map.remove(cKey);
+					changed = true;
+				}
+			}
+		}
+		return changed ? new ArrayList(map.values()) : null;
+	}
+	
+	private static boolean isSettingCompatible(ICLanguageSetting setting, CExternalSetting provider){
+		String ids[] = provider.getCompatibleLanguageIds();
+		String id;
+		if(ids != null && ids.length > 0){
+			id = setting.getLanguageId();
+			if(id != null){
+				if(contains(ids, id))
+					return true;
+				return false;
+			}
+			return false;
+		}
+		
+		ids = provider.getCompatibleContentTypeIds();
+		if(ids != null && ids.length > 0){
+			String[] cTypeIds = setting.getSourceContentTypeIds();
+			if(cTypeIds.length != 0){
+				for(int i = 0; i < cTypeIds.length; i++){
+					id = cTypeIds[i];
+					if(contains(ids, id))
+						return true;
+				}
+				return false;
+			}
+			return false;
+		}
+		
+		ids = provider.getCompatibleExtensions();
+		if(ids != null && ids.length > 0){
+			String [] srcIds = setting.getSourceExtensions();
+			if(srcIds.length != 0){
+				for(int i = 0; i < srcIds.length; i++){
+					id = srcIds[i];
+					if(contains(ids, id))
+						return true;
+				}
+				return false;
+			}
+			return false;
+		}
+		return true;
+	}
+	
+	private static boolean contains(Object array[], Object value){
+		for(int i = 0; i < array.length; i++){
+			if(array[i].equals(value))
+				return true;
+		}
+		return false;
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingProvider.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsHolder.java
similarity index 63%
rename from core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingProvider.java
rename to core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsHolder.java
index 2290deb5333..62c97dd5054 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingProvider.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsHolder.java
@@ -16,41 +16,41 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
-import org.eclipse.cdt.core.settings.model.ICExternalSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICStorageElement;
-import org.eclipse.cdt.internal.core.settings.model.ExternalSettingsManager.ExtSettingMapKey;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettinsDeltaCalculator.ExtSettingMapKey;
 
-public class CExternalSettingProvider {
-	private Map fSettingsMap;;
+public class CExternalSettingsHolder extends CExternalSettingsContainer {
+	private Map fSettingsMap;
 	static final String ELEMENT_EXT_SETTINGS_CONTAINER = "externalSettings"; //$NON-NLS-1$
 	static final CExternalSetting[] EMPTY_EXT_SETTINGS_ARRAY = new CExternalSetting[0];
 	
 	private boolean fIsModified;
 
-	CExternalSettingProvider(){
+	CExternalSettingsHolder(){
 		
 	}
 
-	CExternalSettingProvider(ICStorageElement element){
+	CExternalSettingsHolder(ICStorageElement element){
 		ICStorageElement children[] = element.getChildren();
 		List externalSettingList = null;
 		for(int i = 0; i < children.length; i++){
 			ICStorageElement child = children[i];
 			String name = child.getName();
 			
-			if(CExternalSetting.ELEMENT_SETTING_INFO.equals(name)){
+			if(CExternalSettingSerializer.ELEMENT_SETTING_INFO.equals(name)){
 				if(externalSettingList == null)
 					externalSettingList = new ArrayList();
 				
-				CExternalSetting setting = new CExternalSetting(child);
+				CExternalSetting setting = CExternalSettingSerializer.load(child);
 				externalSettingList.add(setting);
 			}
 		}
 		
 		if(externalSettingList != null && externalSettingList.size() != 0){
 			for(int i = 0; i < externalSettingList.size(); i++){
-				ICExternalSetting setting = (ICExternalSetting)externalSettingList.get(i);
+				CExternalSetting setting = (CExternalSetting)externalSettingList.get(i);
 				createExternalSetting(setting.getCompatibleLanguageIds(),
 						setting.getCompatibleContentTypeIds(),
 						setting.getCompatibleExtensions(), 
@@ -59,40 +59,43 @@ public class CExternalSettingProvider {
 		}
 	}
 
-	CExternalSettingProvider(CExternalSettingProvider base){
+	CExternalSettingsHolder(CExternalSettingsHolder base){
 		if(base.fSettingsMap != null)
 			fSettingsMap = new HashMap(base.fSettingsMap);
 	}
 
-	public ICExternalSetting[] getExternalSettings(){
+	public CExternalSetting[] getExternalSettings(){
 		if(fSettingsMap != null)
-			return (ICExternalSetting[])fSettingsMap.values().toArray(new ICExternalSetting[fSettingsMap.size()]);
+			return (CExternalSetting[])fSettingsMap.values().toArray(new CExternalSetting[fSettingsMap.size()]);
 		return EMPTY_EXT_SETTINGS_ARRAY;
 	}
 	
-	void setExternallSetting(ICExternalSetting[] settings){
+	void setExternallSettings(CExternalSetting[] settings){
 		removeExternalSettings();
 
-		for(int i = 0; i < settings.length; i++){
-			ICExternalSetting setting = settings[i];
-			createExternalSetting(setting.getCompatibleLanguageIds(),
-					setting.getCompatibleContentTypeIds(),
-					setting.getCompatibleExtensions(),
-					setting.getEntries());
+		if(settings != null){
+			for(int i = 0; i < settings.length; i++){
+				CExternalSetting setting = settings[i];
+				createExternalSetting(setting.getCompatibleLanguageIds(),
+						setting.getCompatibleContentTypeIds(),
+						setting.getCompatibleExtensions(),
+						setting.getEntries());
+			}
 		}
 		fIsModified = true;
 	}
 
-	public ICExternalSetting createExternalSetting(String[] languageIDs,
+	public CExternalSetting createExternalSetting(String[] languageIDs,
 			String[] contentTypeIDs, String[] extensions,
-			ICLanguageSettingEntry[] entries) {
+			ICSettingEntry[] entries) {
 		return createExternalSetting(new CExternalSetting(languageIDs, contentTypeIDs, extensions, entries));
 	}
 
-	private ICExternalSetting createExternalSetting(ICExternalSetting setting){
+	private CExternalSetting createExternalSetting(CExternalSetting setting){
 		ExtSettingMapKey key = new ExtSettingMapKey(setting);
+		CExternalSetting newSetting;
 		if(fSettingsMap != null){
-			CExternalSetting newSetting = (CExternalSetting)fSettingsMap.get(key);
+			newSetting = (CExternalSetting)fSettingsMap.get(key);
 			if(newSetting == null){
 				newSetting = new CExternalSetting(setting);
 			} else {
@@ -101,20 +104,19 @@ public class CExternalSettingProvider {
 			
 			fSettingsMap.put(key, newSetting);
 		} else {
-			CExternalSetting newSetting = new CExternalSetting(setting);
+			newSetting = new CExternalSetting(setting);
 			fSettingsMap = new HashMap();
 			fSettingsMap.put(key, newSetting);
 		}
 		fIsModified = true;
-		return setting;
-		
+		return newSetting;
 	}
 
-	public void removeExternalSetting(ICExternalSetting setting) {
+	public void removeExternalSetting(CExternalSetting setting) {
 		if(fSettingsMap != null){
 			
 			ExtSettingMapKey key = new ExtSettingMapKey(setting);
-			ICExternalSetting settingToRemove = (ICExternalSetting)fSettingsMap.get(key);
+			CExternalSetting settingToRemove = (CExternalSetting)fSettingsMap.get(key);
 			if(setting.equals(settingToRemove)){
 				fSettingsMap.remove(key);
 				fIsModified = true;
@@ -134,8 +136,8 @@ public class CExternalSettingProvider {
 		if(fSettingsMap != null && fSettingsMap.size() != 0){
 			for(Iterator iter = fSettingsMap.values().iterator(); iter.hasNext();){
 				CExternalSetting setting = (CExternalSetting)iter.next();
-				ICStorageElement child = el.createChild(CExternalSetting.ELEMENT_SETTING_INFO);
-				setting.serialize(child);
+				ICStorageElement child = el.createChild(CExternalSettingSerializer.ELEMENT_SETTING_INFO);
+				CExternalSettingSerializer.store(setting, child);
 			}
 		}
 	}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsManager.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsManager.java
new file mode 100644
index 00000000000..6417f82ba67
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettingsManager.java
@@ -0,0 +1,761 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.cdt.core.settings.model.ICProjectDescription;
+import org.eclipse.cdt.core.settings.model.ICStorageElement;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettinsDeltaCalculator.ExtSettingsDelta;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IWorkspaceRunnable;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.core.runtime.QualifiedName;
+
+public class CExternalSettingsManager implements ICExternalSettingsListener, ICProjectDescriptionListener{
+	private static final int OP_CHANGED = 1;
+	private static final int OP_ADDED = 2;
+	private static final int OP_REMOVED = 3;
+	
+	private static final QualifiedName EXTERNAL_SETTING_PROPERTY = new QualifiedName(CCorePlugin.PLUGIN_ID, "externalSettings");
+	private static final String EXTERNAL_SETTING_STORAGE_ID = CCorePlugin.PLUGIN_ID + ".externalSettings";
+	
+	private Map fFactoryMap = new HashMap();
+	private static CExternalSettingsManager fInstance;
+	
+	private CExternalSettingsManager(){
+	}
+
+	public void startup(){
+		CProjectDescriptionManager.getInstance().addListener(this, CProjectDescriptionEvent.DATA_APPLIED
+				| CProjectDescriptionEvent.LOADDED);
+	}
+
+	public void shutdown(){
+		for(Iterator iter = fFactoryMap.values().iterator(); iter.hasNext();){
+			FactoryDescriptor dr = (FactoryDescriptor)iter.next();
+			dr.shutdown();
+		}
+		fFactoryMap.clear();
+
+		CProjectDescriptionManager.getInstance().removeListener(this);
+	}
+
+	
+	public static CExternalSettingsManager getInstance(){
+		if(fInstance == null){
+			fInstance = new CExternalSettingsManager();
+		}
+		return fInstance;
+	}
+	
+	public final static class CContainerRef {
+		private String fFactoryId;
+		private String fContainerId;
+		
+		public CContainerRef(String factoryId, String containerId){
+			fFactoryId = factoryId;
+			fContainerId = containerId;
+		}
+
+		public String getFactoryId() {
+			return fFactoryId;
+		}
+
+		public String getContainerId() {
+			return fContainerId;
+		}
+
+		public boolean equals(Object obj) {
+			if(obj == this)
+				return true;
+			
+			if(obj == null)
+				return false;
+			
+			if(!(obj instanceof CContainerRef))
+				return false;
+			
+			CContainerRef other = (CContainerRef)obj;
+			
+			if(!fContainerId.equals(other.fContainerId))
+				return false;
+
+			return fFactoryId.equals(other.fFactoryId);
+		}
+
+		public int hashCode() {
+			return fFactoryId.hashCode() + fContainerId.hashCode();
+		}
+
+		public String toString() {
+			return fFactoryId.toString() + " : " + fContainerId.toString();
+		}
+	}
+	private static class ContainerDescriptor {
+		private FactoryDescriptor fFactoryDr;
+//		private String fContainerId;
+//		private String fProjectName;
+//		private String fCfgId;
+		private CExternalSettingsHolder fHolder;
+		
+		private CExternalSettingsContainer fContainer;
+
+		private ContainerDescriptor(FactoryDescriptor factoryDr,
+				String containerId, 
+				IProject project,
+				ICConfigurationDescription cfgDes){
+			fFactoryDr = factoryDr;
+//			fContainerId = containerId;
+//			fProjectName = project.getName();
+//			fCfgId = cfgDes.getId();
+			try {
+				fContainer = fFactoryDr.getFactory().createContainer(containerId, project, cfgDes);
+			} catch (CoreException e) {
+			}
+			if(fContainer == null)
+				fContainer = NullContainer.INSTANCE;
+		}
+		
+		public CExternalSetting[] getExternalSettings(){
+			if(fHolder == null){
+				fHolder = new CExternalSettingsHolder();
+				fHolder.setExternallSettings(fContainer.getExternalSettings());
+			}
+			return fHolder.getExternalSettings();
+		}
+		
+//		public CExternalSettingsContainer getContainer(){
+//			if(fContainer == null){
+//				IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(fProjectName);
+//				try {
+//					fContainer = fFactoryDr.getFactory().createContainer(fContainerId, project, fCfgId);
+//				} catch (CoreException e) {
+//					CCorePlugin.log(e);
+//				}
+//				if(fContainer == null)
+//					fContainer = NullContainer.INSTANCE;
+//			}
+//			return fContainer;
+//		}
+	}
+	
+	static class NullContainer extends CExternalSettingsContainer {
+		static final NullContainer INSTANCE = new NullContainer();
+		
+		public CExternalSetting[] getExternalSettings() {
+			return new CExternalSetting[0];
+		}
+	}
+	
+	private static class NullFactory extends CExternalSettingContainerFactory {
+		static NullFactory INSTANCE = new NullFactory();
+		
+		public void addListener(ICExternalSettingsListener listener) {
+		}
+
+		public CExternalSettingsContainer createContainer(String id,
+				IProject project, ICConfigurationDescription cfgDes) throws CoreException {
+			return NullContainer.INSTANCE;
+		}
+
+		public String[] getSupplierIds() {
+			return null;
+		}
+
+		public void removeListener(ICExternalSettingsListener listener) {
+		}
+
+		public void shutdown() {
+		}
+
+		public void startup() {
+		}
+	}
+	
+	private class FactoryDescriptor {
+		private CExternalSettingContainerFactory fFactory;
+		private String fId;
+//		private Map fContainerMap;
+		
+		private FactoryDescriptor(String id){
+			fId = id;
+		}
+		
+		private CExternalSettingContainerFactory getFactory(){
+			if(fFactory == null){
+				fFactory = createFactory(fId);
+				fFactory.startup();
+				fFactory.addListener(CExternalSettingsManager.this);
+			}
+			return fFactory;
+		}
+		
+		private CExternalSettingContainerFactory createFactory(String id) {
+			if(id.equals(CfgExportSettingContainerFactory.FACTORY_ID))
+				return CfgExportSettingContainerFactory.getInstance();
+			else if(id.equals(ExtensionContainerFactory.FACTORY_ID))
+				return ExtensionContainerFactory.getInstance();
+			return NullFactory.INSTANCE;
+		}
+		
+		public String getId(){
+			return fId;
+		}
+		
+		public void shutdown(){
+			if(fFactory != null){
+				fFactory.removeListener(CExternalSettingsManager.this);
+				fFactory.shutdown();
+				fFactory = null;
+			}
+		}
+	}
+	
+	private interface ICfgContainer {
+		ICConfigurationDescription getConfguration(boolean write);
+		
+//		boolean isWritable();
+	}
+	
+	private class CfgContainer implements ICfgContainer {
+		private ICConfigurationDescription fCfgDes;
+		
+		CfgContainer(ICConfigurationDescription cfgDes){
+			fCfgDes = cfgDes;
+		}
+		
+		public ICConfigurationDescription getConfguration(boolean write) {
+			return fCfgDes;
+		}
+		
+	}
+	
+	private interface ICRefInfoContainer {
+		CSettingsRefInfo getRefInfo(boolean write);
+	}
+	
+	private class CfgContainerRefInfoContainer implements ICRefInfoContainer{
+		private ICfgContainer fCfgContainer;
+		private CSettingsRefInfo fRefInfo;
+		private boolean fWriteWasRequested;
+		
+		CfgContainerRefInfoContainer(ICfgContainer container){
+			fCfgContainer = container;
+		}
+		
+		public CSettingsRefInfo getRefInfo(boolean write) {
+			if(fRefInfo == null 
+					|| (write && !fWriteWasRequested)){
+				ICConfigurationDescription cfg = fCfgContainer.getConfguration(write);
+				fRefInfo = CExternalSettingsManager.this.getRefInfo(cfg, write);
+				fWriteWasRequested |= write;
+			}
+			return fRefInfo;
+		}
+	}
+	
+//	private class CfgRefInfoContainer implements ICRefInfoContainer{
+//		private CSettingsRefInfo fRefInfo;
+//		private ICConfigurationDescription fCfgDes;
+//		private boolean fWriteWasRequested;
+//		
+//		CfgRefInfoContainer(ICConfigurationDescription cfg){
+//			fCfgDes = cfg;
+//		}
+//
+//		public CSettingsRefInfo getRefInfo(boolean write) {
+//			if(fRefInfo == null 
+//					|| (write && !fWriteWasRequested)){
+//				ICConfigurationDescription cfg = fCfgDes;
+//				fRefInfo = CExternalSettingsManager.this.getRefInfo(cfg, write);
+//				fWriteWasRequested |= write;
+//			}
+//			return fRefInfo;
+//		}
+//	}
+	
+	private class HolderContainer {
+		private ICRefInfoContainer fRIContainer;
+		private CRefSettingsHolder fHolder;
+		private boolean fWriteWasRequested;
+		private CContainerRef fCRef;
+		
+		HolderContainer(ICRefInfoContainer cr, CContainerRef cref){
+			fRIContainer = cr;
+			fCRef = cref;
+		}
+		
+		CRefSettingsHolder getHolder(boolean write){
+			if(fHolder == null 
+					|| (write && !fWriteWasRequested)){
+				CSettingsRefInfo ri = fRIContainer.getRefInfo(write);
+				fHolder = ri.get(fCRef);
+				fWriteWasRequested |= write;
+			}
+			return fHolder;
+		}
+		
+		void setHolder(CRefSettingsHolder holder){
+			fRIContainer.getRefInfo(true).put(holder);
+			fWriteWasRequested = true;
+			fHolder = holder;
+		}
+		
+		void removeHolder(){
+			fWriteWasRequested = true;
+			fHolder = null;
+			fRIContainer.getRefInfo(true).remove(fCRef);
+		}
+	}
+	
+	private static class CfgListCfgContainer implements ICfgContainer{
+		private ICfgList fList;
+		private int fNum;
+		
+		CfgListCfgContainer(ICfgList list, int num){
+			fList = list;
+			fNum = num;
+		}
+		
+		public ICConfigurationDescription getConfguration(boolean write) {
+			return fList.get(fNum, write);
+		}
+
+//		public boolean isWritable() {
+//			return !getConfguration(false).isReadOnly();
+//		}
+	}
+	
+	private interface ICfgList {
+		ICConfigurationDescription get(int num, boolean write);
+
+		int size();
+	}
+	
+	private static class ProjDesCfgList implements ICfgList{
+		private ICProjectDescription fProjDes;
+		private List fCfgList = new ArrayList();
+		
+		public ProjDesCfgList(ICProjectDescription des, Set idSet){
+			fProjDes = des;
+			ICConfigurationDescription[] cfgs = des.getConfigurations();
+			for(int i = 0; i < cfgs.length; i++){
+				if(idSet == null || idSet.contains(cfgs[i].getId()))
+					fCfgList.add(cfgs[i]);
+			}
+		}
+
+		public boolean isWritable(){
+			return !fProjDes.isReadOnly();
+		}
+		
+		public ICConfigurationDescription get(int num, boolean write) {
+			if(write && fProjDes.isReadOnly()){
+				makeWritable();
+			}
+			return (ICConfigurationDescription)fCfgList.get(num);
+		}
+		
+		private void makeWritable(){
+			ICProjectDescription writeDes = CProjectDescriptionManager.getInstance().getProjectDescription(fProjDes.getProject());
+			fProjDes = writeDes;
+			for(int i = 0; i < fCfgList.size(); i++){
+				ICConfigurationDescription cfg = (ICConfigurationDescription)fCfgList.get(i);
+				cfg = writeDes.getConfigurationById(cfg.getId());
+				if(cfg != null)
+					fCfgList.set(i, cfg);
+				else
+					fCfgList.remove(i);
+			}
+		}
+		
+		public int getNumForId(String id){
+			for(int i = 0; i < fCfgList.size(); i++){
+				ICConfigurationDescription cfg = (ICConfigurationDescription)fCfgList.get(i);
+				if(id.equals(cfg.getId()))
+					return i;
+			}
+			return -1;
+		}
+
+		public ICConfigurationDescription getConfigurationById(String id, boolean write){
+			ICConfigurationDescription cfg = fProjDes.getConfigurationById(id);
+			if(cfg == null)
+				return null;
+			if(write && fProjDes.isReadOnly()){
+				makeWritable();
+				cfg = fProjDes.getConfigurationById(id);
+			}
+			return cfg;
+		}
+
+		public int size() {
+			return fCfgList.size();
+		}
+	}
+	
+	private static class DeltaInfo{
+		private boolean fCalculated;
+		private ExtSettingsDelta[] fDeltas;
+		
+		void setDelta(ExtSettingsDelta[] deltas){
+			fDeltas = deltas;
+			fCalculated = true;
+		}
+	}
+
+	private FactoryDescriptor getFactoryDescriptor(String id){
+		FactoryDescriptor dr = (FactoryDescriptor)fFactoryMap.get(id);
+		if(dr == null){
+			dr = new FactoryDescriptor(id);
+			fFactoryMap.put(id, dr);
+		}
+		return dr;
+	}
+	
+	private ContainerDescriptor createDescriptor(String factoryId,
+			String containerId,
+			IProject project,
+			ICConfigurationDescription cfgDes
+			) {
+		FactoryDescriptor dr = getFactoryDescriptor(factoryId);
+		return new ContainerDescriptor(dr, containerId, project, cfgDes);
+	}
+
+	public void settingsChanged(IProject project, String cfgId,
+			CExternalSettingChangeEvent event) {
+		ProjDesCfgList[] lists = null;
+		CExternalSettingsContainerChangeInfo[] infos = event.getChangeInfos();
+		for(int i = 0; i < infos.length; i++){
+			CExternalSettingsContainerChangeInfo info = infos[i];
+			switch(info.getEventType()){
+			case CExternalSettingsContainerChangeInfo.CHANGED:
+				int flags = info.getChangeFlags();
+				if((flags & CExternalSettingsContainerChangeInfo.CONTAINER_CONTENTS) != 0){
+					if(lists == null)
+						lists = createCfgListsForEvent(project, cfgId);
+					containerContentsChanged(lists, info.getContainerInfo(), null);
+				}
+				break;
+			}
+			
+		}
+		
+		if(lists != null)
+			applyLists(lists);
+	}
+	
+	private void applyLists(ProjDesCfgList[] lists){
+		final List list = getModifiedProjDesList(lists);
+		if(list.size() != 0){
+			IWorkspaceRunnable r = new IWorkspaceRunnable(){
+
+				public void run(IProgressMonitor monitor) throws CoreException {
+					for(int i = 0; i < list.size(); i++){
+						ICProjectDescription des = (ICProjectDescription)list.get(i);
+						CProjectDescriptionManager.getInstance().setProjectDescription(des.getProject(), des, false, monitor);
+					}
+				}
+				
+			};
+
+			CProjectDescriptionManager.getInstance().runWspModification(r, new NullProgressMonitor());
+		}
+	}
+	
+	private List getModifiedProjDesList(ProjDesCfgList[] lists){
+		List list = new ArrayList();
+		for(int i = 0; i < lists.length; i++){
+			if(lists[i].isWritable())
+				list.add(lists[i].fProjDes);
+		}
+		return list;
+	}
+	
+	private void containerContentsChanged(ProjDesCfgList[] lists, CContainerRef ref, DeltaInfo deltaInfo){
+		for(int i = 0; i < lists.length; i++){
+			containerContentsChanged(lists[i], null, ref, deltaInfo);
+		}
+	}
+
+	private ProjDesCfgList[] createCfgListsForEvent(IProject project, String cfgId){
+		ProjDesCfgList lists[];
+		if(project != null){
+			ProjDesCfgList l = createCfgList(project, cfgId);
+			if(l != null){
+				lists = new ProjDesCfgList[1];
+				lists[0] = l;
+			} else {
+				lists = new ProjDesCfgList[0];
+			}
+		} else {
+			lists = createCfgLists();
+		}
+		return lists;
+	}
+
+	private ProjDesCfgList[] createCfgLists(){
+		IProject[] projects = ResourcesPlugin.getWorkspace().getRoot().getProjects();
+		List list = new ArrayList();
+		for(int i = 0; i < projects.length; i++){
+			ProjDesCfgList l = createCfgList(projects[i], (Set)null);
+			if(l != null)
+				list.add(l);
+		}
+		return (ProjDesCfgList[])list.toArray(new ProjDesCfgList[list.size()]);
+	}
+
+	private ProjDesCfgList createCfgList(IProject project, String cfgId){
+		Set set = null;
+		if(cfgId != null){
+			set = new HashSet();
+			set.add(cfgId);
+		}
+		
+		return createCfgList(project, set);
+	}
+
+	private ProjDesCfgList createCfgList(IProject project, Set cfgIdSet){
+		ICProjectDescription des = CProjectDescriptionManager.getInstance().getProjectDescription(project, false);
+		if(des == null)
+			return null;
+
+		return new ProjDesCfgList(des, cfgIdSet);
+	}
+	
+	private void containerContentsChanged(ProjDesCfgList list, String[]cfgIds, CContainerRef ref, DeltaInfo deltaInfo){
+		if(cfgIds != null && cfgIds.length != 0){
+			for(int i = 0; i < cfgIds.length; i++){
+				int num = list.getNumForId(cfgIds[i]);
+				if(num >= 0){
+					CfgListCfgContainer cr = new CfgListCfgContainer(list, num);
+					containerContentsChanged(cr, ref, deltaInfo);
+				}
+			}
+		} else {
+			for(int i = 0; i < list.size(); i++){
+				CfgListCfgContainer cr = new CfgListCfgContainer(list, i);
+				containerContentsChanged(cr, ref, deltaInfo);
+			}
+		}
+	}
+	
+	private void containerContentsChanged(ICfgContainer cr, CContainerRef ref, DeltaInfo deltaInfo){
+		processContainerChange(OP_CHANGED, cr, ref, deltaInfo);
+	}
+
+	private void processContainerChange(int op, 
+			ICfgContainer cr, 
+			CContainerRef crInfo,
+			DeltaInfo deltaInfo){
+		processContainerChange(op, cr, new CfgContainerRefInfoContainer(cr), crInfo, deltaInfo);
+	}
+
+	private void processContainerChange(int op, 
+		ICfgContainer cr, 
+		ICRefInfoContainer riContainer, 
+		CContainerRef crInfo,
+		DeltaInfo deltaInfo){
+
+		ICConfigurationDescription cfg = cr.getConfguration(false);
+
+		ExtSettingsDelta[] deltas = checkExternalSettingsChange(op, 
+				cfg.getProjectDescription().getProject(), cfg, riContainer, crInfo);
+		
+		if(deltas != null){
+			applyDeltas(cr, deltas);
+		}
+
+	}
+	
+	private void applyDeltas(ICfgContainer cr, ExtSettingsDelta[] deltas){
+		CExternalSettingsDeltaProcessor.applyDelta(cr.getConfguration(true), deltas);
+	}
+	
+	private static class RefInfoContainer{
+		CSettingsRefInfo fRefInfo;
+		int fInstanceId;
+		
+		RefInfoContainer(CSettingsRefInfo ri, int id){
+			fRefInfo = ri;
+			fInstanceId = id;
+		}
+	}
+	
+	private CSettingsRefInfo getRefInfo(ICConfigurationDescription cfg, boolean write){
+		if(write && cfg.isReadOnly())
+			throw new IllegalArgumentException("writable ref info is requested for the read only config");
+		
+		RefInfoContainer cr = (RefInfoContainer)cfg.getSessionProperty(EXTERNAL_SETTING_PROPERTY);
+		CSettingsRefInfo ri;
+		boolean setCr = false;
+		if(cr == null){
+			ri = load(cfg);
+			if(ri == null)
+				ri = new CSettingsRefInfo();
+			setCr = true;
+		} else if (write && cr.fInstanceId != cfg.hashCode()){
+			ri = new CSettingsRefInfo(cr.fRefInfo);
+			setCr = true;
+		} else {
+			ri = cr.fRefInfo;
+			setCr = false;
+		}
+		
+		if(setCr){
+			cr = new RefInfoContainer(ri, cfg.hashCode());
+			cfg.setSessionProperty(EXTERNAL_SETTING_PROPERTY, cr);
+		}
+		
+		return ri;
+	}
+	
+	private CSettingsRefInfo load(ICConfigurationDescription cfg){
+		try {
+			ICStorageElement el = cfg.getStorage(EXTERNAL_SETTING_STORAGE_ID, false);
+			if(el != null){
+				CSettingsRefInfo ri = new CSettingsRefInfo(el);
+				return ri;
+			}
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+		return null;
+	}
+
+	public void handleEvent(CProjectDescriptionEvent event) {
+		switch(event.getEventType()){
+		case CProjectDescriptionEvent.DATA_APPLIED:
+			checkStore(event.getNewCProjectDescription());
+			break;
+		case CProjectDescriptionEvent.LOADDED:
+			ICProjectDescription des = update(event.getNewCProjectDescription());
+			if(des.isModified()){
+				try {
+					CProjectDescriptionManager.getInstance().setProjectDescription(des.getProject(), des);
+				} catch (CoreException e) {
+					CCorePlugin.log(e);
+				}
+			}
+			break;
+		}
+	}
+
+	private void checkStore(ICProjectDescription des){
+		ICConfigurationDescription[] cfgs = des.getConfigurations();
+		for(int i = 0; i < cfgs.length; i++){
+			checkStore(cfgs[i]);
+		}
+	}
+
+	private void checkStore(ICConfigurationDescription cfg){
+		RefInfoContainer cr = (RefInfoContainer)cfg.getSessionProperty(EXTERNAL_SETTING_PROPERTY);
+		if(cr != null/* && cr.fInstanceId != cfg.hashCode()*/){
+			store(cfg, cr.fRefInfo);
+		}
+	}
+
+	private void store(ICConfigurationDescription cfg, CSettingsRefInfo ri){
+		try {
+			ICStorageElement el = cfg.getStorage(EXTERNAL_SETTING_STORAGE_ID, true);
+			el.clear();
+			ri.serialize(el);
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+	}
+	
+	public void addContainer(ICConfigurationDescription cfg, CContainerRef cr){
+		CfgContainer ccr = new CfgContainer(cfg);
+		processContainerChange(OP_ADDED, ccr, cr, null);
+	}
+
+	public void removeContainer(ICConfigurationDescription cfg, CContainerRef cr){
+		CfgContainer ccr = new CfgContainer(cfg);
+		processContainerChange(OP_REMOVED, ccr, cr, null);
+	}
+	
+	public CContainerRef[] getReferences(ICConfigurationDescription cfg, String factoryId){
+		CSettingsRefInfo info = getRefInfo(cfg, false);
+		return info.getReferences(factoryId);
+	}
+	
+	public ICProjectDescription update(ICProjectDescription des){
+		ProjDesCfgList list = new ProjDesCfgList(des, null);
+		for(int i = 0; i < list.size(); i++){
+			CfgListCfgContainer cfgCr = new CfgListCfgContainer(list, i);
+			CfgContainerRefInfoContainer ric = new CfgContainerRefInfoContainer(cfgCr);
+			CContainerRef[] refs = ric.getRefInfo(false).getReferences();
+			for(int k = 0; k < refs.length; k++){
+				containerContentsChanged(cfgCr, refs[k], null);
+			}
+		}
+		return list.fProjDes;
+	}
+
+	private ExtSettingsDelta[] checkExternalSettingsChange(int op, 
+			IProject proj, 
+			ICConfigurationDescription cfgDes, 
+			ICRefInfoContainer riContainer, 
+			CContainerRef cr){
+		HolderContainer hCr = new HolderContainer(riContainer, cr);
+		CRefSettingsHolder holder = hCr.getHolder(false);
+		if(holder == null && op == OP_ADDED){
+			holder = new CRefSettingsHolder(cr);
+			hCr.setHolder(holder);
+		}
+		
+		if(holder == null)
+			return null;
+		
+		ExtSettingsDelta[] deltas = reconsile(proj, cfgDes, op != OP_REMOVED, hCr, cr);
+		
+		if(op == OP_REMOVED)
+			hCr.removeHolder();
+		return deltas;
+	}
+	
+	private ExtSettingsDelta[] reconsile(IProject proj, ICConfigurationDescription cfgDes, boolean add, HolderContainer hCr, CContainerRef cr){
+//		if(holder.isReconsiled())
+//			return;
+		CExternalSetting[] newSettings = null;
+		CExternalSetting[] oldSettings = hCr.getHolder(false).getExternalSettings();
+		if(add){
+			ContainerDescriptor cdr = createDescriptor(cr.getFactoryId(), cr.getContainerId(), proj, cfgDes);
+			newSettings = cdr.getExternalSettings();
+		}
+		
+		ExtSettingsDelta[] deltas = getDeltaCalculator().getSettingChange(newSettings, oldSettings);
+		if(deltas != null){
+			CRefSettingsHolder holder = hCr.getHolder(true);
+			holder.setExternallSettings(newSettings);
+			holder.setReconsiled(true);
+		}
+		return deltas;
+	}
+	
+	private CExternalSettinsDeltaCalculator getDeltaCalculator(){
+		return CExternalSettinsDeltaCalculator.getInstance();
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettinsDeltaCalculator.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettinsDeltaCalculator.java
new file mode 100644
index 00000000000..5ed0ab3d7e9
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CExternalSettinsDeltaCalculator.java
@@ -0,0 +1,282 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
+import org.eclipse.cdt.core.settings.model.util.CDataUtil;
+import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
+
+class CExternalSettinsDeltaCalculator {
+	static private CExternalSettinsDeltaCalculator fInstance;
+	
+	private CExternalSettinsDeltaCalculator(){
+	}
+	
+	public static CExternalSettinsDeltaCalculator getInstance(){
+		if(fInstance == null)
+			fInstance = new CExternalSettinsDeltaCalculator();
+		return fInstance;
+	}
+
+	
+	static class ExtSettingsDelta {
+		CExternalSetting fSetting;
+		boolean fAdded;
+		KindBasedStore fEntryChangeStore;
+
+		ExtSettingsDelta(CExternalSetting setting){
+			fSetting = setting;
+			fEntryChangeStore = new KindBasedStore();
+		}
+
+		ExtSettingsDelta(CExternalSetting setting, boolean added){
+			fSetting = setting;
+			fAdded = added;
+		}
+		
+		boolean isChange(){
+			return fEntryChangeStore != null;
+		}
+		
+		boolean isAdded(){
+			return fAdded;
+		}
+		
+		CExternalSetting getSetting(){
+			return fSetting;
+		}
+		
+		ICSettingEntry[][] getEntriesDelta(int kind){
+			if(fEntryChangeStore != null)
+				return (ICSettingEntry[][])fEntryChangeStore.get(kind);
+			ICSettingEntry [] entries = fSetting.getEntries(kind);
+			if(entries == null || entries.length == 0)
+				return null;
+			
+			ICSettingEntry[][] delta = new ICSettingEntry[2][];
+			if(fAdded)
+				delta[0] = entries;
+			else 
+				delta[1] = entries;
+			
+			return delta;
+		}
+		
+		ICSettingEntry[][] getEntriesDelta(){
+			int kinds[] = KindBasedStore.getLanguageEntryKinds();
+			List added = new ArrayList();
+			List removed = new ArrayList();
+			for(int i = 0; i < kinds.length; i++){
+				ICSettingEntry[][] d = getEntriesDelta(kinds[i]);
+				if(d == null)
+					continue;
+				
+				if(d[0] != null){
+					added.addAll(Arrays.asList(d[0]));
+				}
+				if(d[1] != null){
+					removed.addAll(Arrays.asList(d[1]));
+				}
+			}
+
+			ICSettingEntry[][] delta = new ICSettingEntry[2][];
+			
+			if(added.size() != 0){
+				delta[0] = (ICSettingEntry[])added.toArray(new ICSettingEntry[added.size()]);
+			}
+			if(removed.size() != 0){
+				delta[1] = (ICSettingEntry[])removed.toArray(new ICSettingEntry[removed.size()]);
+			}
+		
+			return delta;
+		}
+	}
+	
+	 static class ExtSettingMapKey {
+		private ICExternalSetting fSetting;
+		public ExtSettingMapKey(ICExternalSetting setting){
+			fSetting = setting;
+		}
+		
+		public boolean equals(Object obj) {
+			if(obj == this)
+				return true;
+
+			if(!(obj instanceof ExtSettingMapKey))
+				return false;
+			
+			ExtSettingMapKey other = (ExtSettingMapKey)obj;
+			return settingsMatch(fSetting, other.fSetting);
+		}
+		public int hashCode() {
+			return code(fSetting.getCompatibleLanguageIds())
+				+ code(fSetting.getCompatibleContentTypeIds())
+				+ code(fSetting.getCompatibleExtensions());
+		}
+		
+		private int code(String[] arr){
+			if(arr == null || arr.length == 0)
+				return 0;
+			
+			int code = 0;
+			
+			for(int i = 0; i < arr.length; i++){
+				code += arr[i].hashCode();
+			}
+			return code;
+		}
+		
+		public ICExternalSetting getSetting(){
+			return fSetting;
+		}
+		
+	}
+
+	private static ExtSettingsDelta createDelta(CExternalSetting setting1, CExternalSetting setting2){
+
+		int kind;
+		int kinds[] = KindBasedStore.getAllEntryKinds();
+		ExtSettingsDelta extDelta = null;
+		for(int i = 0; i < kinds.length; i++){
+			kind = kinds[i];
+			ICSettingEntry entries1[] = setting1.getEntries(kind);
+			ICSettingEntry entries2[] = setting2.getEntries(kind);
+			Map map1 = CDataUtil.fillEntriesMapByContentsKey(new LinkedHashMap(), entries1); 
+			Map map2 = CDataUtil.fillEntriesMapByContentsKey(new LinkedHashMap(), entries2);
+			Map map1Copy = new LinkedHashMap(map1);
+//			Set set1 = new HashSet(Arrays.asList(entries1));
+//			Set set2 = new HashSet(Arrays.asList(entries2));
+//			Set set1Copy = new HashSet(set1);
+			map1.keySet().removeAll(map2.keySet());
+			map2.keySet().removeAll(map1Copy.keySet());
+
+			ICSettingEntry entriesAdded[] = null, entriesRemoved[] = null;
+
+			if(map1.size() != 0)
+				entriesAdded = (ICSettingEntry[])map1.values().toArray(new ICSettingEntry[map1.size()]);
+
+			if(map2.size() != 0)
+				entriesRemoved = (ICSettingEntry[])map2.values().toArray(new ICSettingEntry[map2.size()]);
+			
+			if(entriesAdded == null && entriesRemoved == null)
+				continue;
+			
+			if(extDelta == null){
+				extDelta = new ExtSettingsDelta(setting1);
+			}
+			extDelta.fEntryChangeStore.put(kind, new ICSettingEntry[][]{entriesAdded, entriesRemoved});
+		}
+		
+		return extDelta;
+	}
+	
+	static boolean settingsMatch(ICExternalSetting setting1, ICExternalSetting setting2) {
+		if(setting1.equals(setting2))
+			return true;
+		
+		return settingsMatch(setting1, 
+				setting2.getCompatibleLanguageIds(),
+				setting2.getCompatibleContentTypeIds(),
+				setting2.getCompatibleExtensions());
+	}
+
+	static boolean settingsMatch(ICExternalSetting setting, 
+			String languageIDs[], String contentTypeIDs[], String extensions[]){
+		if(!Arrays.equals(setting.getCompatibleLanguageIds(), languageIDs))
+			return false;
+		if(!Arrays.equals(setting.getCompatibleContentTypeIds(), contentTypeIDs))
+			return false;
+		if(!Arrays.equals(setting.getCompatibleExtensions(), extensions))
+			return false;
+
+		return true;
+	}
+	
+	private static Map toSettingsKeyMap(ICExternalSetting[] settings){
+		Map map = new HashMap();
+		for(int i = 0; i < settings.length; i++){
+			if(map.put(new ExtSettingMapKey(settings[i]), settings[i]) != null)
+				throw new IllegalArgumentException();
+		}
+		return map;
+	}
+
+	ExtSettingsDelta[] getSettingChange(CExternalSetting newSettings[],
+			CExternalSetting oldSettings[]){
+
+
+		if(newSettings == null || newSettings.length == 0)
+			return createDeltas(oldSettings, false);
+		if(oldSettings == null || oldSettings.length == 0)
+			return createDeltas(newSettings, true);
+
+		List deltaList = new ArrayList();
+		
+		Map newMap= toSettingsKeyMap(newSettings);
+		Map oldMap = toSettingsKeyMap(oldSettings);
+		for(Iterator iter = newMap.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			CExternalSetting newSetting = (CExternalSetting)entry.getValue();
+			CExternalSetting oldSetting = (CExternalSetting)oldMap.remove(entry.getKey());
+			if(oldSetting == null){
+				deltaList.add(new ExtSettingsDelta(newSetting, true));
+			} else {
+				ExtSettingsDelta delta = createDelta(newSetting, oldSetting);
+				if(delta != null)
+					deltaList.add(delta);
+			}
+		}
+		
+		for(Iterator iter = oldMap.values().iterator(); iter.hasNext();){
+			CExternalSetting oldSettng = (CExternalSetting)iter.next();
+			deltaList.add(new ExtSettingsDelta(oldSettng, false));
+		}
+		
+		if(deltaList.size() == 0)
+			return null;
+		return (ExtSettingsDelta[])deltaList.toArray(new ExtSettingsDelta[deltaList.size()]);
+	}
+	
+	private static ExtSettingsDelta[] createDeltas(CExternalSetting settings[], boolean added){
+		if(settings == null || settings.length == 0)
+			return null;
+		
+		ExtSettingsDelta deltas[] = new ExtSettingsDelta[settings.length];
+		for(int i = 0; i < settings.length; i++){
+			deltas[i] = new ExtSettingsDelta(settings[i], added);
+		}
+		
+		return deltas;
+	}
+
+	Set calculateUpdatedEntries(ICSettingEntry current[], ICSettingEntry added[], ICSettingEntry removed[]){
+	//	EntryComparator comparator = new EntryComparator();
+		LinkedHashSet set = new LinkedHashSet();
+		set.addAll(Arrays.asList(current));
+		set.addAll(Arrays.asList(added));
+		set.removeAll(Arrays.asList(removed));
+		
+		return set;
+	}
+
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
index 90e85093485..6c66486ffe1 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
@@ -14,7 +14,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 import org.eclipse.cdt.core.settings.model.ICSettingObject;
-import org.eclipse.cdt.internal.core.settings.model.ExternalSettingsManager.ExtSettingsDelta;
 
 class CProjectDescriptionDelta implements ICDescriptionDelta {
 	private List fChildList = new ArrayList();
@@ -26,7 +25,6 @@ class CProjectDescriptionDelta implements ICDescriptionDelta {
 	private int fAddedLanguageEntriesKinds;
 	private int fRemovedLanguageEntriesKinds;
 	private int fReorderedLanguageEntriesKinds;
-	private ExtSettingsDelta[] fExtSettingsDeltas;
 
 	private static final int KIND_MASK = 3;
 	private static final int FLAGS_OFFSET = 2;
@@ -146,13 +144,4 @@ class CProjectDescriptionDelta implements ICDescriptionDelta {
 		else
 			removeChangeFlags(SETTING_ENTRIES);
 	}
-	
-	public ExtSettingsDelta[] getExtSettingsDeltas(){
-		return fExtSettingsDeltas;
-	}
-
-	public void setExtSettingsDeltas(ExtSettingsDelta[] deltas){
-		fExtSettingsDeltas = deltas;
-	}
-
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
index 9675a27178c..0da711d1e6d 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
@@ -45,6 +45,7 @@ import org.eclipse.cdt.core.model.CModelException;
 import org.eclipse.cdt.core.model.ICElement;
 import org.eclipse.cdt.core.model.ICElementDelta;
 import org.eclipse.cdt.core.model.ICProject;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
 import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
 import org.eclipse.cdt.core.settings.model.ICFileDescription;
 import org.eclipse.cdt.core.settings.model.ICFolderDescription;
@@ -53,6 +54,7 @@ import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICProjectDescription;
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.core.settings.model.ICSettingBase;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
 import org.eclipse.cdt.core.settings.model.ICSettingObject;
 import org.eclipse.cdt.core.settings.model.ICSettingsStorage;
 import org.eclipse.cdt.core.settings.model.ICSourceEntry;
@@ -76,6 +78,7 @@ import org.eclipse.cdt.internal.core.CConfigBasedDescriptorManager;
 import org.eclipse.cdt.internal.core.envvar.ContributedEnvironment;
 import org.eclipse.cdt.internal.core.model.CElementDelta;
 import org.eclipse.cdt.internal.core.model.CModelManager;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettinsDeltaCalculator.ExtSettingsDelta;
 import org.eclipse.core.filesystem.EFS;
 import org.eclipse.core.filesystem.IFileStore;
 import org.eclipse.core.resources.IFile;
@@ -321,6 +324,8 @@ public class CProjectDescriptionManager {
 				fDescriptorManager.startup();
 			}
 			
+			CExternalSettingsManager.getInstance().startup();
+			
 			IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
 			Job rcJob = new Job(SettingsModelMessages.getString("CProjectDescriptionManager.0")){ //$NON-NLS-1$
 				protected IStatus run(IProgressMonitor monitor) {
@@ -362,6 +367,8 @@ public class CProjectDescriptionManager {
 	}
 
 	public void shutdown(){
+		CExternalSettingsManager.getInstance().shutdown();
+		
 		if(fDescriptorManager != null){
 			fDescriptorManager.shutdown();
 		}
@@ -458,13 +465,13 @@ public class CProjectDescriptionManager {
 					
 					des = getLoaddedDescription(project);
 					
-					ICProjectDescription updatedDes = ExternalSettingsManager.getInstance().updateReferencedSettings(des);
-					if(updatedDes != des){
-						try {
-							setProjectDescription(project, updatedDes);
-						} catch (CoreException e) {
-						}
-					}
+//					ICProjectDescription updatedDes = ExternalSettingsManager.getInstance().updateReferencedSettings(des);
+//					if(updatedDes != des){
+//						try {
+//							setProjectDescription(project, updatedDes);
+//						} catch (CoreException e) {
+//						}
+//					}
 				}
 			}
 		}
@@ -2080,7 +2087,7 @@ public class CProjectDescriptionManager {
 			}
 
 			
-			ExternalSettingsManager.getInstance().calculateCfgExtSettingsDelta(delta);
+			calculateCfgExtSettingsDelta(delta);
 			
 			int drFlags = calculateDescriptorFlags(newCfg, oldCfg);
 			if(drFlags != 0)
@@ -2090,6 +2097,78 @@ public class CProjectDescriptionManager {
 		return delta.isEmpty() ? null : delta;
 	}
 	
+	private void calculateCfgExtSettingsDelta(CProjectDescriptionDelta delta){
+		ICConfigurationDescription newDes = (ICConfigurationDescription)delta.getNewSetting();
+		ICConfigurationDescription oldDes = (ICConfigurationDescription)delta.getOldSetting();
+		ExtSettingsDelta[] deltas = getSettingChange(newDes, oldDes);
+		int flags = 0;
+		int addedRemoved = ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED | ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED; 
+		if(deltas != null ){
+			for(int i = 0; i < deltas.length; i++){
+				ICSettingEntry[][] d = deltas[i].getEntriesDelta();
+				if(d[0] != null)
+					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED;
+				if(d[1] != null)
+					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED;
+				
+				if((flags & (addedRemoved)) == addedRemoved)
+					break;
+			}
+//			delta.setExtSettingsDeltas(deltas);
+			if(flags != 0)
+				delta.addChangeFlags(flags);
+		}
+		
+		int cfgRefFlags = calcRefChangeFlags(newDes, oldDes);
+		if(cfgRefFlags != 0)
+			delta.addChangeFlags(cfgRefFlags);
+	}
+	
+	private int calcRefChangeFlags(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
+		Map newMap = newDes != null ? newDes.getReferenceInfo() : null;  
+		Map oldMap = oldDes != null ? oldDes.getReferenceInfo() : null;
+		
+		int flags = 0;
+		if(newMap == null || newMap.size() == 0){
+			if(oldMap != null && oldMap.size() != 0){
+				flags = ICDescriptionDelta.CFG_REF_REMOVED;
+			}
+		} else {
+			if(oldMap == null || oldMap.size() == 0){
+				flags = ICDescriptionDelta.CFG_REF_ADDED;
+			} else {
+				boolean stop = false;
+				for(Iterator iter = newMap.entrySet().iterator(); iter.hasNext();){
+					Map.Entry newEntry = (Map.Entry)iter.next();
+					Object newProj = newEntry.getKey();
+					Object newCfg = newEntry.getValue();
+					Object oldCfg = oldMap.remove(newProj);
+					if(!newCfg.equals(oldCfg)){
+						flags |= ICDescriptionDelta.CFG_REF_ADDED;
+						if(oldCfg != null){
+							flags |= ICDescriptionDelta.CFG_REF_REMOVED;
+							stop = true;
+						}
+						if(stop)
+							break;
+					}
+				}
+				
+				if(!oldMap.isEmpty())
+					flags |= ICDescriptionDelta.CFG_REF_REMOVED;
+			}
+		}
+		
+		return flags;
+	}
+
+	
+	private ExtSettingsDelta[] getSettingChange(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
+		CExternalSetting[] newSettings = newDes != null ? (CExternalSetting[])newDes.getExternalSettings() : null;
+		CExternalSetting[] oldSettings = oldDes != null ? (CExternalSetting[])oldDes.getExternalSettings() : null;
+		return CExternalSettinsDeltaCalculator.getInstance().getSettingChange(newSettings, oldSettings);
+	}
+	
 	private CProjectDescriptionDelta createDelta(ICFolderDescription newFo, ICFolderDescription oldFo){
 		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newFo, oldFo);
 		
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CRefSettingsHolder.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CRefSettingsHolder.java
new file mode 100644
index 00000000000..f0d39cbde90
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CRefSettingsHolder.java
@@ -0,0 +1,61 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import org.eclipse.cdt.core.settings.model.ICStorageElement;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.CContainerRef;
+
+public class CRefSettingsHolder extends CExternalSettingsHolder {
+	private static final String ATTR_FACTORY_ID = "factoryId";
+	private static final String ATTR_CONTAINER_ID = "containerId";
+	private CContainerRef fContainerRef;
+	private boolean fIsReconsiled;
+
+	public CRefSettingsHolder(CContainerRef ref) {
+		super();
+		
+		fContainerRef = ref;
+	}
+
+	public CRefSettingsHolder(CRefSettingsHolder base) {
+		super(base);
+
+		fContainerRef = base.fContainerRef;
+		fIsReconsiled = base.fIsReconsiled;
+	}
+
+	public CRefSettingsHolder(ICStorageElement element) {
+		super(element);
+
+		String factoryId = element.getAttribute(ATTR_FACTORY_ID); 
+		String containerId = element.getAttribute(ATTR_CONTAINER_ID);
+		
+		fContainerRef = new CContainerRef(factoryId, containerId);
+	}
+
+	public CContainerRef getContainerInfo(){
+		return fContainerRef;
+	}
+	
+	public boolean isReconsiled(){
+		return fIsReconsiled;
+	}
+	
+	public void setReconsiled(boolean s){
+		fIsReconsiled = s;
+	}
+
+	public void serialize(ICStorageElement el) {
+		super.serialize(el);
+		el.setAttribute(ATTR_FACTORY_ID, fContainerRef.getFactoryId());
+		el.setAttribute(ATTR_CONTAINER_ID, fContainerRef.getContainerId());
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CSettingsRefInfo.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CSettingsRefInfo.java
new file mode 100644
index 00000000000..df535a06c61
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CSettingsRefInfo.java
@@ -0,0 +1,104 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.cdt.core.settings.model.ICStorageElement;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.CContainerRef;
+
+class CSettingsRefInfo {
+	final static String ELEMENT_REFERENCE_INFO = "referenceInfo";  //$NON-NLS-1$
+	private HashMap fESHolderMap = new HashMap();
+
+	CSettingsRefInfo(){
+	}
+
+	CSettingsRefInfo(ICStorageElement el){
+		
+		ICStorageElement children[] = el.getChildren();
+		for(int i = 0; i < children.length; i++){
+			ICStorageElement child = children[i];
+			String name = child.getName();
+			if(CRefSettingsHolder.ELEMENT_EXT_SETTINGS_CONTAINER.equals(name)){
+				CRefSettingsHolder h = new CRefSettingsHolder(child);
+				CContainerRef r = h.getContainerInfo();
+				fESHolderMap.put(r, h);
+			}
+		}
+	}
+
+	CSettingsRefInfo(CSettingsRefInfo base){
+		fESHolderMap = (HashMap)base.fESHolderMap.clone();
+		for(Iterator iter = fESHolderMap.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			CRefSettingsHolder h = (CRefSettingsHolder)entry.getValue();
+			h = new CRefSettingsHolder(h);
+			entry.setValue(h);
+		}
+		
+	}
+	
+//	Map getContainerMapForFactory(String id){
+//		Map map = new HashMap();
+//		for(Iterator iter = fESHolderMap.entrySet().iterator(); iter.hasNext();){
+//			Map.Entry entry = (Map.Entry)iter.next();
+//			CContainerRef r = (CContainerRef)entry.getKey();
+//			if(r.getFactoryId().equals(id))
+//				map.put(r.getContainerId(), r);
+//		}
+//		return map;
+//	}
+	
+//	Map getContainerMapCopy(){
+//		return new HashMap(fESHolderMap);
+//	}
+	
+	CContainerRef[] getReferences(String factoryId){
+		List list = new ArrayList();
+		for(Iterator iter = fESHolderMap.keySet().iterator(); iter.hasNext();){
+			CContainerRef r = (CContainerRef)iter.next();
+			if(r.getFactoryId().equals(factoryId))
+				list.add(r);
+		}
+		return (CContainerRef[])list.toArray(new CContainerRef[list.size()]);
+	}
+
+	CContainerRef[] getReferences(){
+		return (CContainerRef[])fESHolderMap.keySet().toArray(new CContainerRef[fESHolderMap.size()]);
+	}
+
+	CRefSettingsHolder get(CContainerRef cRef){
+		return (CRefSettingsHolder)fESHolderMap.get(cRef);
+	}
+	
+	void serialize(ICStorageElement element){
+		for(Iterator iter = fESHolderMap.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			CRefSettingsHolder h = (CRefSettingsHolder)entry.getValue();
+			ICStorageElement child = element.createChild(CRefSettingsHolder.ELEMENT_EXT_SETTINGS_CONTAINER);
+			h.serialize(child);
+		}
+	}
+	
+	void put(CRefSettingsHolder holder){
+		fESHolderMap.put(holder.getContainerInfo(), holder);
+	}
+	
+	CRefSettingsHolder remove(CContainerRef cRef){
+		return (CRefSettingsHolder)fESHolderMap.remove(cRef);
+	}
+
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CfgExportSettingContainerFactory.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CfgExportSettingContainerFactory.java
new file mode 100644
index 00000000000..631229378ed
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CfgExportSettingContainerFactory.java
@@ -0,0 +1,287 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.cdt.core.settings.model.ICExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICProjectDescription;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.CContainerRef;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.NullContainer;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.ListenerList;
+
+public class CfgExportSettingContainerFactory extends
+		CExternalSettingContainerFactory implements ICProjectDescriptionListener {
+	static final String FACTORY_ID = CCorePlugin.PLUGIN_ID + ".cfg.export.settings.sipplier";
+	private static final char DELIMITER = ';';
+	private ListenerList fListenerList;
+	
+	private static CfgExportSettingContainerFactory fInstance;
+
+	private CfgExportSettingContainerFactory(){
+	}
+	
+	public static CfgExportSettingContainerFactory getInstance(){
+		if(fInstance == null)
+			fInstance = new CfgExportSettingContainerFactory();
+		return fInstance;
+	}
+	
+	public void startup(){
+		CProjectDescriptionManager.getInstance().addListener(this, 
+				CProjectDescriptionEvent.APPLIED
+				| CProjectDescriptionEvent.LOADDED);
+	}
+	
+	public void shutdown(){
+		CProjectDescriptionManager.getInstance().removeListener(this);
+	}
+	
+	private class CfgRefContainer extends CExternalSettingsContainer {
+		private String fProjName, fCfgId;
+		
+		CfgRefContainer(String projName, String cfgId){
+			fProjName = projName;
+			fCfgId = cfgId;
+		}
+
+		public CExternalSetting[] getExternalSettings() {
+			IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(fProjName);
+			if(project.exists() && project.isOpen()){
+				ICProjectDescription des = CProjectDescriptionManager.getInstance().getProjectDescription(project, false);
+				if(des != null){
+					ICConfigurationDescription cfg = fCfgId.length() != 0 ? 
+							des.getConfigurationById(fCfgId) : des.getActiveConfiguration();
+					
+					if(cfg != null){
+						ICExternalSetting[] ies = cfg.getExternalSettings();
+						if(ies instanceof CExternalSetting[])
+							return (CExternalSetting[])ies;
+						CExternalSetting[] es = new CExternalSetting[ies.length];
+						System.arraycopy(ies, 0, es, 0, es.length);
+						return es;
+					}
+				}
+			}
+			return new CExternalSetting[0];
+		}
+		
+	}
+	
+	public CExternalSettingsContainer createContainer(String id,
+			IProject project, ICConfigurationDescription cfgDes) {
+		try {
+			String[] r = parseId(id);
+			return new CfgRefContainer(r[0], r[1]);
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+		return new NullContainer();
+	}
+	
+	private static void createReference(ICConfigurationDescription cfg, String projName, String cfgId){
+		CContainerRef cr = createContainerRef(projName, cfgId);
+		CExternalSettingsManager.getInstance().addContainer(cfg, cr);
+	}
+
+	private static void removeReference(ICConfigurationDescription cfg, String projName, String cfgId){
+		CContainerRef cr = createContainerRef(projName, cfgId);
+		CExternalSettingsManager.getInstance().removeContainer(cfg, cr);
+	}
+
+	private static CContainerRef createContainerRef(String projName, String cfgId){
+		return new CContainerRef(FACTORY_ID, createId(projName, cfgId));
+	}
+	
+	public static Map getReferenceMap(ICConfigurationDescription cfg){
+		CContainerRef[] refs = CExternalSettingsManager.getInstance().getReferences(cfg, FACTORY_ID);
+		Map map = new HashMap();
+		for(int i = 0; i < refs.length; i++){
+			try {
+				String[] r = parseId(refs[i].getContainerId());
+				map.put(r[0], r[1]);
+				
+			} catch (CoreException e) {
+				CCorePlugin.log(e);
+			}
+		}
+		return map;
+	}
+
+	public static void setReferenceMap(ICConfigurationDescription cfg, Map map){
+		Map cur = getReferenceMap(cfg);
+		Map newCopy = new HashMap(map);
+		
+		for(Iterator iter = cur.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			Object projName = entry.getKey();
+			if(newCopy.containsKey(projName) && entry.getValue().equals(newCopy.get(projName))){
+				iter.remove();
+				newCopy.remove(projName);
+			}
+		}
+		for(Iterator iter = cur.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			removeReference(cfg, (String)entry.getKey(), (String)entry.getValue());
+		}
+		for(Iterator iter = newCopy.entrySet().iterator(); iter.hasNext();){
+			Map.Entry entry = (Map.Entry)iter.next();
+			createReference(cfg, (String)entry.getKey(), (String)entry.getValue());
+		}
+	}
+
+	private static String createId(String projName, String cfgId){
+		return new StringBuffer().append(projName).append(DELIMITER).append(cfgId).toString();
+	}
+	private static String[] parseId(String id) throws CoreException {
+		if(id == null)
+			throw new NullPointerException();
+		
+		String projName, cfgId;
+		int index = id.indexOf(DELIMITER);
+		if(index != -1){
+			projName = id.substring(0, index);
+			cfgId = id.substring(index + 1);
+		} else {
+			projName = id;
+			cfgId = "";
+		}
+		
+		if((projName = projName.trim()).length() == 0)
+			throw ExceptionFactory.createCoreException("invalid id: project name not specified");
+		
+		return new String[]{projName, cfgId};
+	}
+
+	public void addListener(ICExternalSettingsListener listener){
+		if(fListenerList == null)
+			fListenerList = new ListenerList();
+		
+		fListenerList.add(listener);
+	}
+	
+	public void removeListener(ICExternalSettingsListener listener){
+		if(fListenerList == null)
+			return;
+		
+		fListenerList.remove(listener);
+	}
+	
+	public void handleEvent(CProjectDescriptionEvent event) {
+		switch(event.getEventType()){
+			case CProjectDescriptionEvent.LOADDED:
+			case CProjectDescriptionEvent.APPLIED:
+				String[] ids = getContainerIds(event.getProjectDelta());
+				if(ids.length != 0){
+					CExternalSettingsContainerChangeInfo[] changeInfos = 
+						new CExternalSettingsContainerChangeInfo[ids.length];
+					
+					for(int i = 0; i < changeInfos.length; i++){
+						changeInfos[i] = new CExternalSettingsContainerChangeInfo(
+								CExternalSettingsContainerChangeInfo.CONTAINER_CONTENTS,
+								new CContainerRef(FACTORY_ID, ids[i]),
+								null);
+					}
+					notifySettingsChange(changeInfos);
+				}
+		}
+		// TODO Auto-generated method stub
+		
+	}
+	
+	private String[] getContainerIds(ICDescriptionDelta delta){
+		if(delta == null)
+			return new String[0];
+		int deltaKind = delta.getDeltaKind();
+		
+		List cfgIds = new ArrayList();
+		switch(deltaKind){
+		case ICDescriptionDelta.ADDED:
+		case ICDescriptionDelta.REMOVED:
+			ICProjectDescription des = (ICProjectDescription)delta.getSetting();
+			ICConfigurationDescription[] cfgs = des.getConfigurations();
+			if(cfgs.length != 0){
+				for(int i = 0; i < cfgs.length; i++){
+					cfgIds.add(cfgs[i].getId());
+				}
+				cfgIds.add("");
+			}
+			
+		case ICDescriptionDelta.CHANGED:
+			ICDescriptionDelta[] children = delta.getChildren();
+			collectCfgIds(children, cfgIds);
+			if((delta.getChangeFlags() & ICDescriptionDelta.ACTIVE_CFG) != 0)
+				cfgIds.add("");
+		}
+
+
+		String[] ids = new String[cfgIds.size()];
+		if(ids.length != 0){
+			String projName = ((ICProjectDescription)delta.getSetting()).getProject().getName();
+			for(int i = 0; i < ids.length; i++){
+				ids[i] = createId(projName, (String)cfgIds.get(i));
+			}
+		}
+		
+		return ids;
+	}
+	
+	public Collection collectCfgIds(ICDescriptionDelta[] deltas, Collection c){
+		if(c == null)
+			c = new ArrayList();
+		for(int i = 0; i < deltas.length; i++){
+			ICDescriptionDelta delta = deltas[i];
+			int deltaKind = delta.getDeltaKind();
+			
+			switch(deltaKind){
+			case ICDescriptionDelta.ADDED:
+			case ICDescriptionDelta.REMOVED:
+				c.add(delta.getSetting().getId());
+				break;
+			case ICDescriptionDelta.CHANGED:
+				int changeFlags = delta.getChangeFlags();
+				if((changeFlags & 
+						(ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED
+								| ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED)) != 0){
+					c.add(delta.getSetting().getId());
+				}
+			}
+		}
+		
+		return c;
+	}
+
+	protected void notifySettingsChange(CExternalSettingsContainerChangeInfo[] infos){
+		if(fListenerList == null)
+			return;
+		
+		if(infos.length == 0)
+			return;
+		
+		CExternalSettingChangeEvent event = new CExternalSettingChangeEvent(infos);
+		
+		Object[] listeners = fListenerList.getListeners();
+		for(int i = 0; i < listeners.length; i++){
+			((ICExternalSettingsListener)listeners[i]).settingsChanged(null, null, event);
+		}
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExtensionContainerFactory.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExtensionContainerFactory.java
new file mode 100644
index 00000000000..a8407cd9fde
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExtensionContainerFactory.java
@@ -0,0 +1,160 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.cdt.core.settings.model.extension.CExternalSettingProvider;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.Platform;
+
+public class ExtensionContainerFactory extends CExternalSettingContainerFactory {
+	static final String FACTORY_ID = CCorePlugin.PLUGIN_ID + ".extension.container.factory";
+	private static final String EXTENSION_ID = CCorePlugin.PLUGIN_ID + ".externalSettingsProvider";
+	
+	private static ExtensionContainerFactory fInstance;
+	private Map fDescriptorMap;
+
+	private static class NullProvider extends CExternalSettingProvider {
+		private static final NullProvider INSTANCE = new NullProvider();
+		
+		public CExternalSetting[] getSettings(IProject project, ICConfigurationDescription cfg) {
+			return new CExternalSetting[0];
+		}
+		
+	}
+	
+	private static class CESContainer extends CExternalSettingsContainer {
+		private CExternalSetting[] fSettings;
+
+		CESContainer(CExternalSetting[] settings){
+			fSettings = (CExternalSetting[])settings.clone();
+		}
+		
+		public CExternalSetting[] getExternalSettings() {
+			return (CExternalSetting[])fSettings.clone();
+		}
+		
+	}
+	
+	private static class CExtensionSettingProviderDescriptor {
+		private static final String PROVIDER = "provider";
+		private static final String CLASS = "class";
+		
+		private IExtension fExtension;
+		private IConfigurationElement fProviderElement;
+		private String fId;
+		private CExternalSettingProvider fProvider;
+		
+		CExtensionSettingProviderDescriptor(IExtension extension){
+			fId = extension.getUniqueIdentifier();
+			fExtension = extension;
+		}
+		
+		public String getId(){
+			return fId;
+		}
+		
+		private CExternalSettingProvider getProvider(){
+			if(fProvider == null){
+				try {
+					fProvider = createProvider();
+				} catch (CoreException e) {
+					CCorePlugin.log(e);
+				}
+				if(fProvider == null){
+					fProvider = NullProvider.INSTANCE;
+				}
+			}
+			return fProvider;
+		}
+		
+		CExternalSettingsContainer getContainer(IProject project, ICConfigurationDescription cfg){
+			return new CESContainer(getProvider().getSettings(project, cfg));
+		}
+
+		CExternalSettingProvider createProvider() throws CoreException{
+			IConfigurationElement el = getProviderElement();
+			if(el != null){
+				Object obj = el.createExecutableExtension(CLASS);
+				if(obj instanceof CExternalSettingProvider){
+					return (CExternalSettingProvider)obj;
+				} else
+					throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("invalid setting provider class specified"));
+			}
+			throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("provider element not specified"));
+		}
+		
+		private IConfigurationElement getProviderElement(){
+			if(fProviderElement == null)
+				fProviderElement = getProviderElement(fExtension);
+			return fProviderElement;
+		}
+		
+		private static IConfigurationElement getProviderElement(IExtension ext){
+			IConfigurationElement els[] = ext.getConfigurationElements();
+			for(int i = 0; i < els.length; i++){
+				IConfigurationElement el = els[i];
+				String name = el.getName();
+				if(PROVIDER.equals(name))
+					return el;
+			}					
+			return null;
+		}
+	}
+	
+	private Map getProviderDescriptorMap(){
+		if(fDescriptorMap == null){
+			initProviderInfoSynch();
+		}
+		return fDescriptorMap;
+	}
+	
+	private synchronized void initProviderInfoSynch(){
+		if(fDescriptorMap != null)
+			return;
+		
+		IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(EXTENSION_ID);
+		IExtension exts[] = extensionPoint.getExtensions();
+		fDescriptorMap = new HashMap();
+		
+		for(int i = 0; i < exts.length; i++){
+			CExtensionSettingProviderDescriptor dr = new CExtensionSettingProviderDescriptor(exts[i]);
+			fDescriptorMap.put(dr.getId(), dr);
+		}
+	}
+
+	private ExtensionContainerFactory(){
+	}
+	
+	public static ExtensionContainerFactory getInstance(){
+		if(fInstance == null){
+			fInstance = new ExtensionContainerFactory();
+		}
+		return fInstance;
+	}
+
+	public CExternalSettingsContainer createContainer(String id,
+			IProject project, ICConfigurationDescription cfgDes) throws CoreException {
+		CExtensionSettingProviderDescriptor dr = (CExtensionSettingProviderDescriptor)getProviderDescriptorMap().get(id);
+		if(dr != null)
+			return dr.getContainer(project, cfgDes);
+		return CExternalSettingsManager.NullContainer.INSTANCE;
+	}
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExternalSettingsManager.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExternalSettingsManager.java
deleted file mode 100644
index 9ed4edba38b..00000000000
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ExternalSettingsManager.java
+++ /dev/null
@@ -1,1070 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2007 Intel Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * Intel Corporation - Initial API and implementation
- *******************************************************************************/
-package org.eclipse.cdt.internal.core.settings.model;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.NoSuchElementException;
-import java.util.Set;
-
-import org.eclipse.cdt.core.model.CoreModel;
-import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
-import org.eclipse.cdt.core.settings.model.ICExternalSetting;
-import org.eclipse.cdt.core.settings.model.ICFileDescription;
-import org.eclipse.cdt.core.settings.model.ICFolderDescription;
-import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
-import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
-import org.eclipse.cdt.core.settings.model.ICProjectDescription;
-import org.eclipse.cdt.core.settings.model.ICResourceDescription;
-import org.eclipse.cdt.core.settings.model.ICSettingBase;
-import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
-import org.eclipse.cdt.core.settings.model.util.ListComparator;
-import org.eclipse.core.resources.IProject;
-import org.eclipse.core.resources.IWorkspaceRoot;
-import org.eclipse.core.resources.ResourcesPlugin;
-import org.eclipse.core.runtime.CoreException;
-
-public class ExternalSettingsManager {
-	static private ExternalSettingsManager fInstance;
-	
-	private ExternalSettingsManager(){
-	}
-	
-	public static ExternalSettingsManager getInstance(){
-		if(fInstance == null)
-			fInstance = new ExternalSettingsManager();
-		return fInstance;
-	}
-
-/*	private static class EntryComparator extends Comparator {
-
-		public boolean equal(Object o1, Object o2) {
-			ICLanguageSettingEntry entry1 = (ICLanguageSettingEntry)o1;
-			ICLanguageSettingEntry entry2 = (ICLanguageSettingEntry)o2;
-/*			int kind = entry1.getKind();
-			
-			if(entry2.getKind() != kind)
-				return false;
-			
-			if(!entry1.getName().equals(entry2.getName()))
-				return false;
-			
-			return kind  == ICLanguageSettingEntry.MACRO ?
-					entry1.getValue().equals(entry2.getValue()) : true;
-*/
-/*			return entry1.equalsByContents(entry2);
-		}
-		
-	}
-*/	
-	public void updateReferenceInfo(CConfigurationDescription des, Map newRefMap) throws CoreException{
-		CConfigurationSpecSettings settings = des.getSpecSettings();
-		
-		if(settings == null)
-			return;
-		
-		Map projRefInfoMap = settings.getProjectRefInfoMap();
-		
-		Map[] delta = calculateReferenceDelta(newRefMap, new HashMap(projRefInfoMap));
-		if(delta != null){
-			Map removed = delta[1];
-			Map added = delta[0];
-			
-			if(removed != null){
-				List removedInfos = handleProjReferenceAddRemove(des, removed, false);
-				for(Iterator iter = removedInfos.iterator(); iter.hasNext();){
-					ProjectRefInfo info = (ProjectRefInfo)iter.next();
-					projRefInfoMap.remove(info.getProjectName());
-				}
-			}
-			
-			if(added != null){
-				List addedInfos = handleProjReferenceAddRemove(des, added, true);
-				for(Iterator iter = addedInfos.iterator(); iter.hasNext();){
-					ProjectRefInfo info = (ProjectRefInfo)iter.next();
-					projRefInfoMap.put(info.getProjectName(), info);
-				}
-			}
-
-			settings.setProjectRefInfoMap(projRefInfoMap);
-		}
-		
-	}
-	
-	private static void calculateDeltas(ICProjectDescription des, boolean added, Map deltaMap){
-		ICConfigurationDescription configs[] = des.getConfigurations();
-		for(int i = 0; i < configs.length; i++){
-			ExtSettingsDelta deltas[] = getSettingChange(configs[i], null);
-			if(deltas != null){
-				deltaMap.put(configs[i].getId(), deltas);
-				if(configs[i].isActive())
-					deltaMap.put("", deltas); //$NON-NLS-1$
-			}
-		}
-	}
-
-/*	private static ExtSettingsDelta[] calculateDeltas(ICDescriptionDelta projectDelta, String cfgId, ICExternalSetting oldSettings[]){
-		ICProjectDescription newDes = (ICProjectDescription)projectDelta.getNewSetting();
-//		ICProjectDescription oldDes = (ICProjectDescription)projectDelta.getOldSetting();
-
-		switch(projectDelta.getDeltaKind()){
-		case ICDescriptionDelta.ADDED:{
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-			if(newCfg == null)
-				return null;
-			return getSettingChange(newCfg.getExternalSettings(), oldSettings);
-		}
-		case ICDescriptionDelta.REMOVED:{
-//			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);
-//			if(oldCfg == null)
-//				return null;
-			return getSettingChange(null, oldSettings);
-		}
-		case ICDescriptionDelta.CHANGED:{
-//			boolean activeCfgChanged = (projectDelta.getChangeFlags() | ICDescriptionDelta.ACTIVE_CFG) != 0;
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-//			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);;
-			return getSettingChange(newCfg.getExternalSettings(), oldSettings);
-		}
-		}
-		return null;
-	}
-*/
-	private ICExternalSetting[][] getNewOldSettings(ICDescriptionDelta projectDelta, String cfgId){
-		ICExternalSetting[][] settings = new ICExternalSetting[2][];
-		ICProjectDescription newDes = (ICProjectDescription)projectDelta.getNewSetting();
-		ICProjectDescription oldDes = (ICProjectDescription)projectDelta.getOldSetting();
-
-		switch(projectDelta.getDeltaKind()){
-		case ICDescriptionDelta.ADDED:{
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-			if(newCfg != null){
-				settings[0] = newCfg.getExternalSettings();
-			}
-			break;
-		}
-		case ICDescriptionDelta.REMOVED:{
-			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);
-			if(oldCfg != null){
-				settings[1] = oldCfg.getExternalSettings();
-			}
-			break;
-		}
-		case ICDescriptionDelta.CHANGED:{
-//			boolean activeCfgChanged = (projectDelta.getChangeFlags() | ICDescriptionDelta.ACTIVE_CFG) != 0;
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);;
-			
-			settings[0] = newCfg.getExternalSettings();
-			settings[1] = oldCfg.getExternalSettings();
-			break;
-		}
-		}
-		return settings;
-	}
-
-/*	private static ExtSettingsDelta[] calculateDeltas(ICDescriptionDelta projectDelta, String cfgId){
-		ICProjectDescription newDes = (ICProjectDescription)projectDelta.getNewSetting();
-		ICProjectDescription oldDes = (ICProjectDescription)projectDelta.getOldSetting();
-
-		switch(projectDelta.getDeltaKind()){
-		case ICDescriptionDelta.ADDED:{
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-			if(newCfg == null)
-				return null;
-			return getSettingChange(newCfg, null);
-		}
-		case ICDescriptionDelta.REMOVED:{
-			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);
-			if(oldCfg == null)
-				return null;
-			return getSettingChange(null, oldCfg);
-		}
-		case ICDescriptionDelta.CHANGED:{
-//			boolean activeCfgChanged = (projectDelta.getChangeFlags() | ICDescriptionDelta.ACTIVE_CFG) != 0;
-			ICConfigurationDescription newCfg = getConfigurationById(newDes, cfgId);
-			ICConfigurationDescription oldCfg = getConfigurationById(oldDes, cfgId);;
-			return getSettingChange(newCfg, oldCfg);
-		}
-		}
-		return null;
-	}
-*/
-	private static ICConfigurationDescription getConfigurationById(ICProjectDescription des, String id){
-		return id.length() != 0 ?
-				des.getConfigurationById(id) :
-				des.getActiveConfiguration();
-	}
-
-	public ICProjectDescription updateReferencedSettings(ICProjectDescription des){
-		CfgDesIterator cfgIter = new CfgDesIterator(des);
-		while(cfgIter.hasNext()){
-			CConfigurationSpecSettings specSettings;
-			try {
-				specSettings = ((IInternalCCfgInfo)cfgIter.next(false)).getSpecSettings();
-			} catch (CoreException e) {
-				continue;
-			}
-			Map map = specSettings.getProjectRefInfoMap();
-			for(Iterator iter = map.values().iterator(); iter.hasNext();){
-				ProjectRefInfo info = (ProjectRefInfo)iter.next();
-				ICConfigurationDescription refDes = getConfiguration(info.getProjectName(), info.getCfgId(), false);
-				if(refDes != null){
-					ICExternalSetting extSettings[] = refDes.getExternalSettings();
-					updateReferencedSettings(cfgIter, info, (ICExternalSetting[])extSettings, null);
-				}
-			}
-			
-		}
-		return cfgIter.getProjectDescription();
-	}
-	
-	private static ICConfigurationDescription getConfiguration(String projName, String cfgId, boolean write){
-		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
-		CoreModel model = CoreModel.getDefault();
-
-		IProject project = root.getProject(projName);
-		if(!project.exists())
-			return null;
-		
-		ICProjectDescription des = model.getProjectDescription(project, write);
-		if(des == null)
-			return null;
-		
-		return des.getConfigurationById(cfgId);
-}
-	
-	private static void updateReferencedSettings(ICfgContainer cr, ProjectRefInfo refInfo, ICExternalSetting newSettings[], ExtSettingsDelta[] deltas){
-		if(!refInfo.isSynchronized()){
-			CExternalSettingProvider provider = refInfo.getProvider();
-			ICExternalSetting oldSettings[] = provider.getExternalSettings();
-			deltas = getSettingChange(newSettings, oldSettings);
-		}
-		
-		String refProjName = refInfo.getProjectName();
-		String refCfgId = refInfo.getCfgId();
-//		provider.setExternallSetting((CExternalSetting[])newOldSettings[0]);
-		
-		refInfo.setSynchronized(true);
-		if(deltas != null && deltas.length != 0){
-		
-			CConfigurationDescription writableCfg = (CConfigurationDescription)cr.getConfguration(true);
-			if(writableCfg != null){
-				try {
-					CConfigurationSpecSettings settings = writableCfg.getSpecSettings();
-					
-					refInfo = (ProjectRefInfo)settings.getProjectRefInfoMap().get(refProjName);
-					if(refInfo != null && refInfo.getCfgId().equals(refCfgId)){
-						applyDelta(writableCfg, deltas);
-						refInfo.getProvider().setExternallSetting(newSettings);
-						refInfo.setSynchronized(true);
-					}
-				} catch (CoreException e) {
-				}
-			}
-		}
-
-	}
-	
-/*	private static ICProjectDescription updateReferencedSettings(ICConfigurationDescription des){
-		Map map = des.getReferenceInfo();
-		ICConfigurationDescription refs[] = getReferencedConfigs(map, false);
-		if(refs.length != 0){
-			for(int i = 0; i < refs.length; i++){
-				ICConfigurationDescription ref = refs[i];
-			}
-		}
-	}
-	
-	private static ICConfigurationDescription[] getReferencedConfigs(Map map, boolean write){
-		if(map.size() != 0){
-			List list = new ArrayList(map.size());
-			for(Iterator iter = map.entrySet().iterator(); iter.hasNext();){
-				Map.Entry entry = (Map.Entry)iter.next();
-				String projName = (String)entry.getKey();
-				String cfgId = (String)entry.getValue();
-				
-				ICConfigurationDescription refCfgDes = getConfiguration(projName, cfgId, write);
-				if(refCfgDes == null)
-					continue;
-				
-				list.add(refCfgDes);
-			}
-			
-			if(list.size() != 0){
-				return (ICConfigurationDescription[])list.toArray(new ICConfigurationDescription[list.size()]);
-			}
-		}
-		
-		return new ICConfigurationDescription[0];
-	}
-*/	
-	private interface ICfgContainer {
-		ICConfigurationDescription getConfguration(boolean write);
-	}
-
-	private static class CfgDesIterator implements ICfgContainer{
-		private ICProjectDescription fProjDes;
-		private ICConfigurationDescription fCurrentDes;
-		private List fCfgList;
-		private Set fProcessedSet = new HashSet();
-		private boolean fWriteStatusChanged;
-		
-		
-		public CfgDesIterator(ICProjectDescription des){
-			fProjDes = des;
-			fCfgList = new ArrayList(Arrays.asList(fProjDes.getConfigurations()));
-		}
-		
-		public boolean isReadOnly(){
-			return fProjDes.isReadOnly();
-		}
-		
-		public ICConfigurationDescription next(boolean write){
-			if(fCfgList.isEmpty())
-				throw new NoSuchElementException();
-			
-			fCurrentDes = (ICConfigurationDescription)fCfgList.remove(fCfgList.size() - 1);
-			fProcessedSet.add(fCurrentDes.getId());
-			return current(write);
-		}
-
-		public ICConfigurationDescription current(boolean write){
-			if(fCurrentDes == null)
-				return next(write);
-			
-			ICConfigurationDescription writableCfg = null;
-			if(write && fCurrentDes.isReadOnly()){
-				fWriteStatusChanged = true;
-				ICProjectDescription wDes = CoreModel.getDefault().getProjectDescription(fProjDes.getProject());
-				if(wDes != null){
-					writableCfg = wDes.getConfigurationById(fCurrentDes.getId());
-					if(writableCfg != null){
-						fCurrentDes = writableCfg;
-						fProjDes = wDes;
-						ICConfigurationDescription dess[] = fProjDes.getConfigurations();
-						fCfgList.clear();
-						for(int i = 0; i < dess.length; i++){
-							if(!fProcessedSet.contains(dess[i].getId())){
-								fCfgList.add(dess[i]);
-							}
-						}
-					}
-				}
-				return writableCfg;
-			}
-			return fCurrentDes;
-		}
-		
-		public ICProjectDescription getProjectDescription(){
-			return fProjDes;
-		}
-
-		public boolean hasNext(){
-			return !fCfgList.isEmpty();
-		}
-		
-		public boolean isWriteStatusChanged(){
-			return fWriteStatusChanged;
-		}
-
-		public ICConfigurationDescription getConfguration(boolean write) {
-			return current(write);
-		}
-	}
-	
-	public void updateDepentents(ICDescriptionDelta projectDelta){
-		if(projectDelta == null)
-			return;
-		
-		Map deltaMap = new HashMap(); 
-		ICProjectDescription newDes = (ICProjectDescription)projectDelta.getNewSetting();
-		ICProjectDescription oldDes = (ICProjectDescription)projectDelta.getOldSetting();
-
-		switch(projectDelta.getDeltaKind()){
-		case ICDescriptionDelta.ADDED:
-			calculateDeltas(newDes, true, deltaMap);
-			break;
-		case ICDescriptionDelta.REMOVED:
-			calculateDeltas(oldDes, false, deltaMap);
-			break;
-		case ICDescriptionDelta.CHANGED:
-			ICDescriptionDelta[] children = projectDelta.getChildren();
-			ICDescriptionDelta child;
-			boolean activeCfgChanged = (projectDelta.getChangeFlags() & ICDescriptionDelta.ACTIVE_CFG) != 0;
-			for(int i = 0; i < children.length; i++){
-				child = children[i];
-				ICConfigurationDescription newCfg = (ICConfigurationDescription)child.getNewSetting();
-//				ICConfigurationDescription oldCfg = (ICConfigurationDescription)child.getOldSetting();
-				ExtSettingsDelta deltas[] = ((CProjectDescriptionDelta)child).getExtSettingsDeltas();//getSettingChange(newCfg, oldCfg);
-				if(deltas != null){
-					deltaMap.put(newCfg.getId(), deltas);
-					if(!activeCfgChanged && newCfg.isActive()){
-						deltaMap.put("", deltas); //$NON-NLS-1$
-					}
-				}
-			}
-			
-			if(activeCfgChanged){
-				ICConfigurationDescription newCfg = newDes.getActiveConfiguration();
-				ICConfigurationDescription oldCfg = oldDes.getActiveConfiguration();
-				ExtSettingsDelta deltas[] = getSettingChange(newCfg, oldCfg);
-				if(deltas != null)
-					deltaMap.put("", deltas); //$NON-NLS-1$
-			}
-		}
-		
-		if(deltaMap.size() == 0)
-			return;
-		
-		IProject currentProject = ((ICProjectDescription)projectDelta.getSetting()).getProject();
-		String currentProjectName = currentProject.getName();
-		IProject projects[] = ResourcesPlugin.getWorkspace().getRoot().getProjects();
-		
-		CProjectDescriptionManager mngr = CProjectDescriptionManager.getInstance();
-		for(int i = 0; i < projects.length; i++){
-			IProject proj = projects[i];
-			if(proj.equals(currentProject))
-				continue;
-			
-			ICProjectDescription projDes = mngr.getProjectDescription(proj, false);
-			if(projDes == null)
-				continue;
-			
-			CfgDesIterator cfgIter = new CfgDesIterator(projDes);
-			while(cfgIter.hasNext()){
-				ICConfigurationDescription cfg = cfgIter.next(false);
-				CConfigurationSpecSettings settings = null;
-				try {
-					settings = ((IInternalCCfgInfo)cfg).getSpecSettings();
-				} catch (CoreException e) {
-				}
-				
-				if(settings == null)
-					continue;
-				
-				Map map = settings.getProjectRefInfoMap();
-				
-				ProjectRefInfo refInfo = (ProjectRefInfo)map.get(currentProjectName);
-				if(refInfo == null)
-					continue;
-				
-				String cfgId = refInfo.getCfgId();
-				ExtSettingsDelta deltas[] = null;
-				ICExternalSetting[][] newOldSettings = getNewOldSettings(projectDelta, cfgId);
-				deltas = (ExtSettingsDelta[])deltaMap.get(cfgId);
-				
-				updateReferencedSettings(cfgIter, refInfo, (ICExternalSetting[])newOldSettings[0], deltas);
-			}
-		
-			if(cfgIter.isWriteStatusChanged()){
-				try {
-					mngr.setProjectDescription(proj, cfgIter.getProjectDescription());
-				} catch (CoreException e) {
-				}
-			}
-		}
-	}
-	
-	static class ExtSettingsDelta {
-		ICExternalSetting fSetting;
-		boolean fAdded;
-		KindBasedStore fEntryChangeStore;
-
-		ExtSettingsDelta(ICExternalSetting setting){
-			fSetting = setting;
-		}
-
-		ExtSettingsDelta(ICExternalSetting setting, boolean added){
-			fSetting = setting;
-			fAdded = added;
-		}
-		
-		boolean isChange(){
-			return fEntryChangeStore != null;
-		}
-		
-		boolean isAdded(){
-			return fAdded;
-		}
-		
-		ICExternalSetting getSetting(){
-			return fSetting;
-		}
-		
-		ICLanguageSettingEntry[][] getEntriesDelta(int kind){
-			if(fEntryChangeStore != null)
-				return (ICLanguageSettingEntry[][])fEntryChangeStore.get(kind);
-			ICLanguageSettingEntry [] entries = fSetting.getEntries(kind);
-			if(entries == null || entries.length == 0)
-				return null;
-			
-			ICLanguageSettingEntry[][] delta = new ICLanguageSettingEntry[2][];
-			if(fAdded)
-				delta[0] = entries;
-			else 
-				delta[1] = entries;
-			
-			return delta;
-		}
-		
-		ICLanguageSettingEntry[][] getEntriesDelta(){
-			int kinds[] = KindBasedStore.getLanguageEntryKinds();
-			List added = new ArrayList();
-			List removed = new ArrayList();
-			for(int i = 0; i < kinds.length; i++){
-				ICLanguageSettingEntry[][] d = getEntriesDelta(kinds[i]);
-				if(d == null)
-					continue;
-				
-				if(d[0] != null){
-					added.addAll(Arrays.asList(d[0]));
-				}
-				if(d[1] != null){
-					removed.addAll(Arrays.asList(d[1]));
-				}
-			}
-
-			ICLanguageSettingEntry[][] delta = new ICLanguageSettingEntry[2][];
-			
-			if(added.size() != 0){
-				delta[0] = (ICLanguageSettingEntry[])added.toArray(new ICLanguageSettingEntry[added.size()]);
-			}
-			if(removed.size() != 0){
-				delta[1] = (ICLanguageSettingEntry[])removed.toArray(new ICLanguageSettingEntry[removed.size()]);
-			}
-		
-			return delta;
-		}
-		
-
-
-	}
-	
-	 static class ExtSettingMapKey {
-		private ICExternalSetting fSetting;
-		public ExtSettingMapKey(ICExternalSetting setting){
-			fSetting = setting;
-		}
-		
-		public boolean equals(Object obj) {
-			if(obj == this)
-				return true;
-
-			if(!(obj instanceof ExtSettingMapKey))
-				return false;
-			
-			ExtSettingMapKey other = (ExtSettingMapKey)obj;
-			return settingsMatch(fSetting, other.fSetting);
-		}
-		public int hashCode() {
-			return code(fSetting.getCompatibleLanguageIds())
-				+ code(fSetting.getCompatibleContentTypeIds())
-				+ code(fSetting.getCompatibleExtensions());
-		}
-		
-		private int code(String[] arr){
-			if(arr == null || arr.length == 0)
-				return 0;
-			
-			int code = 0;
-			
-			for(int i = 0; i < arr.length; i++){
-				code += arr[i].hashCode();
-			}
-			return code;
-		}
-		
-		public ICExternalSetting getSetting(){
-			return fSetting;
-		}
-		
-	}
-/*	
-	private static class ExtSettingsComparator extends Comparator{
-		private List fDeltaList = null;
-		private int fKinds[] = KindBasedStore.getSupportedKinds();
-		private Comparator fEntryComparator = new Comparator();
-
-		public boolean equal(Object o1, Object o2) {
-			ICExternalSetting setting1 = (ICExternalSetting)o1;
-			ICExternalSetting setting2 = (ICExternalSetting)o2;
-			if(settingsMatch(setting1, setting2)){
-				int kind;
-				ExtSettingsDelta extDelta = null;
-				for(int i = 0; i < fKinds.length; i++){
-					kind = fKinds[i];
-					ICLanguageSettingEntry entries1[] = setting1.getEntries(kind);
-					ICLanguageSettingEntry entries2[] = setting2.getEntries(kind);
-					List delta[] = ListComparator.compare(entries1, entries2, fEntryComparator);
-					if(delta == null)
-						continue;
-					ICLanguageSettingEntry entries[][] = new ICLanguageSettingEntry[2][];
-					if(delta[0] != null)
-						entries[0] = (ICLanguageSettingEntry[])delta[0].toArray(new ICLanguageSettingEntry[delta[0].size()]);
-					if(delta[1] != null)
-						entries[1] = (ICLanguageSettingEntry[])delta[1].toArray(new ICLanguageSettingEntry[delta[1].size()]);
-					
-					if(extDelta == null){
-						extDelta = new ExtSettingsDelta(setting1);
-						extDelta.fEntryChangeStore = new KindBasedStore();
-						if(fDeltaList == null)
-							fDeltaList = new ArrayList();
-						fDeltaList.add(extDelta);
-					}
-					
-					extDelta.fEntryChangeStore.put(kind, entries);
-				}
-				
-				return true;
-			}
-			return false;
-		}
-	}
-*/
-	private static ExtSettingsDelta createDelta(ICExternalSetting setting1, ICExternalSetting setting2){
-
-		int kind;
-		int kinds[] = KindBasedStore.getLanguageEntryKinds();
-		ExtSettingsDelta extDelta = null;
-		for(int i = 0; i < kinds.length; i++){
-			kind = kinds[i];
-			ICLanguageSettingEntry entries1[] = setting1.getEntries(kind);
-			ICLanguageSettingEntry entries2[] = setting2.getEntries(kind);
-			List delta[] = ListComparator.compare(entries1, entries2);
-			if(delta == null)
-				continue;
-			ICLanguageSettingEntry entries[][] = new ICLanguageSettingEntry[2][];
-			if(delta[0] != null)
-				entries[0] = (ICLanguageSettingEntry[])delta[0].toArray(new ICLanguageSettingEntry[delta[0].size()]);
-			if(delta[1] != null)
-				entries[1] = (ICLanguageSettingEntry[])delta[1].toArray(new ICLanguageSettingEntry[delta[1].size()]);
-			
-			if(extDelta == null){
-				extDelta = new ExtSettingsDelta(setting1);
-				extDelta.fEntryChangeStore = new KindBasedStore();
-			}
-			
-			extDelta.fEntryChangeStore.put(kind, entries);
-		}
-		
-		return extDelta;
-	
-	}
-	
-	static boolean settingsMatch(ICExternalSetting setting1, ICExternalSetting setting2) {
-		if(setting1.equals(setting2))
-			return true;
-		
-		return settingsMatch(setting1, 
-				setting2.getCompatibleLanguageIds(),
-				setting2.getCompatibleContentTypeIds(),
-				setting2.getCompatibleExtensions());
-	}
-
-	static boolean settingsMatch(ICExternalSetting setting, 
-			String languageIDs[], String contentTypeIDs[], String extensions[]){
-		if(!Arrays.equals(setting.getCompatibleLanguageIds(), languageIDs))
-			return false;
-		if(!Arrays.equals(setting.getCompatibleContentTypeIds(), contentTypeIDs))
-			return false;
-		if(!Arrays.equals(setting.getCompatibleExtensions(), extensions))
-			return false;
-
-		return true;
-	}
-	
-	private static ExtSettingsDelta[] getSettingChange(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
-		return getSettingChange(newDes != null ? newDes.getExternalSettings() : null,
-				oldDes != null ? oldDes.getExternalSettings() : null);
-	}
-	
-	private static Map toSettingsKeyMap(ICExternalSetting[] settings){
-		Map map = new HashMap();
-		for(int i = 0; i < settings.length; i++){
-			if(map.put(new ExtSettingMapKey(settings[i]), settings[i]) != null)
-				throw new IllegalArgumentException();
-		}
-		return map;
-	}
-
-	private static ExtSettingsDelta[] getSettingChange(ICExternalSetting newSettings[],
-			ICExternalSetting oldSettings[]){
-
-
-		if(newSettings == null || newSettings.length == 0)
-			return createDeltas(oldSettings, false);
-		if(oldSettings == null || oldSettings.length == 0)
-			return createDeltas(newSettings, true);
-
-		List deltaList = new ArrayList();
-		
-		Map newMap= toSettingsKeyMap(newSettings);
-		Map oldMap = toSettingsKeyMap(oldSettings);
-		for(Iterator iter = newMap.entrySet().iterator(); iter.hasNext();){
-			Map.Entry entry = (Map.Entry)iter.next();
-			ICExternalSetting newSetting = (ICExternalSetting)entry.getValue();
-			ICExternalSetting oldSetting = (ICExternalSetting)oldMap.remove(entry.getKey());
-			if(oldSetting == null){
-				deltaList.add(new ExtSettingsDelta(newSetting, true));
-			} else {
-				ExtSettingsDelta delta = createDelta(newSetting, oldSetting);
-				if(delta != null)
-					deltaList.add(delta);
-			}
-		}
-		
-		for(Iterator iter = oldMap.values().iterator(); iter.hasNext();){
-			ICExternalSetting oldSettng = (ICExternalSetting)iter.next();
-			deltaList.add(new ExtSettingsDelta(oldSettng, false));
-		}
-		
-		if(deltaList.size() == 0)
-			return null;
-		return (ExtSettingsDelta[])deltaList.toArray(new ExtSettingsDelta[deltaList.size()]);
-	}
-	
-	private static ExtSettingsDelta[] createDeltas(ICExternalSetting settings[], boolean added){
-		if(settings == null || settings.length == 0)
-			return null;
-		
-		ExtSettingsDelta deltas[] = new ExtSettingsDelta[settings.length];
-		for(int i = 0; i < settings.length; i++){
-			deltas[i] = new ExtSettingsDelta(settings[i], added);
-		}
-		
-		return deltas;
-	}
-
-	private static List handleProjReferenceAddRemove(CConfigurationDescription des, Map delta, boolean added){
-		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
-		List list = new ArrayList();
-		for(Iterator iter = delta.entrySet().iterator(); iter.hasNext();){
-			Map.Entry entry = (Map.Entry)iter.next();
-			String projName = (String)entry.getKey();
-			IProject project = (IProject)root.findMember(projName);
-			if(project != null){
-				ICExternalSetting settings[];
-				Object cfgInfo = entry.getValue();
-				ProjectRefInfo info;
-				if(cfgInfo instanceof String){
-					String cfgId = (String)cfgInfo;
-					settings = getExternalSettingsForProjCfg(project, cfgId);
-					info = new ProjectRefInfo(projName, cfgId);
-					info.getProvider().setExternallSetting(settings);
-				} else {
-					info = (ProjectRefInfo)cfgInfo;
-					settings = (info).getProvider().getExternalSettings();
-				}
-				list.add(info);
-				if(settings.length != 0){
-					ExtSettingsDelta deltas[] = new ExtSettingsDelta[settings.length];
-					for(int i = 0; i < deltas.length; i++){
-						deltas[i] = new ExtSettingsDelta(settings[i], added);
-					}
-					
-					applyDelta(des, deltas);
-				}
-			}
-		}
-		return list;
-	}
-	
-	private static void applyDelta(ICConfigurationDescription des, ExtSettingsDelta deltas[]){
-		ICResourceDescription rcDess[] = des.getResourceDescriptions();
-		for(int i = 0; i < rcDess.length; i++){
-			ICResourceDescription rcDes = rcDess[i];
-			if(rcDes.getType() == ICSettingBase.SETTING_FOLDER){
-				applyDelta((ICFolderDescription)rcDes, deltas);
-			} else {
-				applyDelta((ICFileDescription)rcDes, deltas);
-			}
-		}
-	}
-	
-	private static void applyDelta(ICFileDescription des, ExtSettingsDelta deltas[]){
-		ICLanguageSetting setting = des.getLanguageSetting();
-		if(setting == null)
-			return;
-		for(int i = 0; i < deltas.length; i++){
-			if(isSettingCompatible(setting, deltas[i].fSetting)){
-				applyDelta(setting, deltas[i]);
-			}
-		}
-	}
-
-	private static void applyDelta(ICFolderDescription des, ExtSettingsDelta deltas[]){
-		ICLanguageSetting settings[] = des.getLanguageSettings();
-		if(settings == null || settings.length == 0)
-			return;
-		
-		ICLanguageSetting setting;
-		for(int k = 0; k < settings.length; k++){
-			setting = settings[k];
-			for(int i = 0; i < deltas.length; i++){
-				if(isSettingCompatible(setting, deltas[i].fSetting)){
-					applyDelta(setting, deltas[i]);
-				}
-			}
-		}
-	}
-
-	private static void applyDelta(ICLanguageSetting setting, ExtSettingsDelta delta){
-		int kinds[] = KindBasedStore.getLanguageEntryKinds();
-		int kind;
-		ICLanguageSettingEntry entries[];
-		ICLanguageSettingEntry diff[][];
-		for(int i = 0; i < kinds.length; i++){
-			kind = kinds[i];
-			diff = delta.getEntriesDelta(kind);
-			if(diff == null)
-				continue;
-			
-			entries = setting.getSettingEntries(kind);
-			List list = calculateUpdatedEntries(entries, diff[0], diff[1]);
-			
-			if(list != null)
-				setting.setSettingEntries(kind, list);
-		}
-	}
-	
-	private static List calculateUpdatedEntries(ICLanguageSettingEntry current[], ICLanguageSettingEntry added[], ICLanguageSettingEntry removed[]){
-	//	EntryComparator comparator = new EntryComparator();
-		List toAdd = ListComparator.getAdded(added, current);
-		List toLeave = ListComparator.getAdded(current, removed);
-		
-		List result;
-		if(toAdd != null){
-			result = toAdd;
-			if(toLeave != null){
-				toAdd.addAll(toLeave);
-			}
-		} else {
-			result = toLeave;
-		}
-		
-		if(result == null)
-			result = new ArrayList(0);
-		return result;
-	}
-	
-/*	private static ICExternalSetting[] getExternalSettingsForRefMap(Map map){
-		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
-		List list = null;
-		for(Iterator iter = map.entrySet().iterator(); iter.hasNext();){
-			Map.Entry entry = (Map.Entry)iter.next();
-			String projName = (String)entry.getKey();
-			IProject project = (IProject)root.findMember(projName);
-			if(project != null){
-				ICExternalSetting settings[] = getExternalSettingsForProjCfg(project, (String)entry.getValue());
-				if(settings.length != 0){
-					if(list == null)
-						list = new ArrayList();
-					for(int i = 0; i < settings.length; i++){
-						list.add(settings[i]);
-					}
-				}
-			}
-		}
-		
-		if(list != null)
-			return (ICExternalSetting[])list.toArray(new ICExternalSetting[list.size()]);
-		return CConfigurationSpecSettings.EMPTY_EXT_SETTINGS_ARRAY;
-	}
-*/	
-	private static ICExternalSetting[] getExternalSettingsForProjCfg(IProject project, String cfgId){
-		ICProjectDescription projDes = CProjectDescriptionManager.getInstance().getProjectDescription(project, false);
-		if(projDes != null){
-			ICConfigurationDescription refCfg = cfgId.length() != 0 ?
-					projDes.getConfigurationById(cfgId)
-					: projDes.getActiveConfiguration();
-
-			if(refCfg != null)
-				return refCfg.getExternalSettings();
-		}
-		
-		return CExternalSettingProvider.EMPTY_EXT_SETTINGS_ARRAY;
-	}
-	
-	private static Map[] calculateReferenceDelta(Map newRef, Map oldRef){
-		Map delta[] = new Map[2];
-		if(newRef != null && newRef.size() != 0){
-			if(oldRef != null && oldRef.size() != 0){
-				Map added = new HashMap();
-				Map removed = new HashMap();
-				for(Iterator iter = newRef.entrySet().iterator(); iter.hasNext();){
-					Map.Entry entry = (Map.Entry)iter.next();
-					String proj = (String)entry.getKey();
-					String cfg = (String)entry.getValue();
-					iter.remove();
-						
-					ProjectRefInfo oldRefInfo = (ProjectRefInfo)oldRef.remove(proj);
-					if(oldRefInfo != null){
-						String oldCfgId = oldRefInfo.getCfgId();
-						if(!cfg.equals(oldCfgId)){
-							added.put(proj, cfg);
-							removed.put(proj, oldRefInfo);
-						}
-					} else {
-						added.put(proj, cfg);
-					}
-				}
-				
-				if(oldRef.size() > 0){
-					for(Iterator iter = oldRef.entrySet().iterator(); iter.hasNext();){
-						Map.Entry entry = (Map.Entry)iter.next();
-						String proj = (String)entry.getKey();
-						ProjectRefInfo info = (ProjectRefInfo)entry.getValue();
-						removed.put(proj, info);
-					}
-				}
-				
-				delta[0] = added;
-				delta[1] = removed;
-				
-			} else {
-				delta[0] = new HashMap(newRef);
-				delta[1] = null;//new HashMap(0);
-			}
-		} else {
-			delta[0] = null;//new HashMap(0);
-			delta[1] = oldRef != null ? new HashMap(oldRef) : null;//new HashMap(0);
-		}
-		
-		if(delta[0] != null && delta[0].size() == 0)
-			delta[0] = null;
-		if(delta[1] != null && delta[1].size() == 0)
-			delta[1] = null;
-		
-		if(delta[0] == null && delta[1] == null)
-			delta = null;
-		
-		return delta;
-	}
-
-	private static boolean isSettingCompatible(ICLanguageSetting setting, ICExternalSetting provider){
-		String ids[] = provider.getCompatibleLanguageIds();
-		String id;
-		if(ids != null && ids.length > 0){
-			id = setting.getLanguageId();
-			if(id != null){
-				if(contains(ids, id))
-					return true;
-				return false;
-			}
-		}
-		
-		ids = provider.getCompatibleContentTypeIds();
-		if(ids != null && ids.length > 0){
-			String[] cTypeIds = setting.getSourceContentTypeIds();
-			if(cTypeIds.length != 0){
-				for(int i = 0; i < cTypeIds.length; i++){
-					id = cTypeIds[i];
-					if(contains(ids, id))
-						return true;
-				}
-			}
-			return false;
-		}
-		
-		ids = provider.getCompatibleExtensions();
-		if(ids != null && ids.length > 0){
-			String [] srcIds = setting.getSourceExtensions();
-			if(srcIds.length != 0){
-				for(int i = 0; i < srcIds.length; i++){
-					id = srcIds[i];
-					if(contains(ids, id))
-						return true;
-				}
-				return false;
-			}
-		}
-		return true;
-	}
-	
-	private static boolean contains(Object array[], Object value){
-		for(int i = 0; i < array.length; i++){
-			if(array[i].equals(value))
-				return true;
-		}
-		return false;
-	}
-	
-	private static int calcRefChangeFlags(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
-		Map newMap = newDes != null ? newDes.getReferenceInfo() : null;  
-		Map oldMap = oldDes != null ? oldDes.getReferenceInfo() : null;
-		
-		int flags = 0;
-		if(newMap == null || newMap.size() == 0){
-			if(oldMap != null && oldMap.size() != 0){
-				flags = ICDescriptionDelta.CFG_REF_REMOVED;
-			}
-		} else {
-			if(oldMap == null || oldMap.size() == 0){
-				flags = ICDescriptionDelta.CFG_REF_ADDED;
-			} else {
-				boolean stop = false;
-				for(Iterator iter = newMap.entrySet().iterator(); iter.hasNext();){
-					Map.Entry newEntry = (Map.Entry)iter.next();
-					Object newProj = newEntry.getKey();
-					Object newCfg = newEntry.getValue();
-					Object oldCfg = oldMap.remove(newProj);
-					if(!newCfg.equals(oldCfg)){
-						flags |= ICDescriptionDelta.CFG_REF_ADDED;
-						if(oldCfg != null){
-							flags |= ICDescriptionDelta.CFG_REF_REMOVED;
-							stop = true;
-						}
-						if(stop)
-							break;
-					}
-				}
-				
-				if(!oldMap.isEmpty())
-					flags |= ICDescriptionDelta.CFG_REF_REMOVED;
-			}
-		}
-		
-		return flags;
-	}
-	
-	void calculateCfgExtSettingsDelta(CProjectDescriptionDelta delta){
-		ICConfigurationDescription newDes = (ICConfigurationDescription)delta.getNewSetting();
-		ICConfigurationDescription oldDes = (ICConfigurationDescription)delta.getOldSetting();
-		ExtSettingsDelta[] deltas = getSettingChange(newDes, oldDes);
-		int flags = 0;
-		int addedRemoved = ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED | ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED; 
-		if(deltas != null ){
-			for(int i = 0; i < deltas.length; i++){
-				ICLanguageSettingEntry[][] d = deltas[i].getEntriesDelta();
-				if(d[0] != null)
-					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED;
-				if(d[1] != null)
-					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED;
-				
-				if((flags & (addedRemoved)) == addedRemoved)
-					break;
-			}
-			delta.setExtSettingsDeltas(deltas);
-			if(flags != 0)
-				delta.addChangeFlags(flags);
-		}
-		
-		int cfgRefFlags = calcRefChangeFlags(newDes, oldDes);
-		if(cfgRefFlags != 0)
-			delta.addChangeFlags(cfgRefFlags);
-	}
-}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ICExternalSettingsListener.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ICExternalSettingsListener.java
new file mode 100644
index 00000000000..0419ed7fce0
--- /dev/null
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ICExternalSettingsListener.java
@@ -0,0 +1,17 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import org.eclipse.core.resources.IProject;
+
+public interface ICExternalSettingsListener {
+	void settingsChanged(IProject project, String cfgId, CExternalSettingChangeEvent event);
+}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ProjectRefInfo.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ProjectRefInfo.java
deleted file mode 100644
index 241c43e31af..00000000000
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/ProjectRefInfo.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2007 Intel Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * Intel Corporation - Initial API and implementation
- *******************************************************************************/
-package org.eclipse.cdt.internal.core.settings.model;
-
-import org.eclipse.cdt.core.settings.model.ICStorageElement;
-
-class ProjectRefInfo {
-	private final static String ATTRIBUTE_REF_PROJECT = "project";  //$NON-NLS-1$
-	private final static String ATTRIBUTE_REF_CFG_ID = "configuration";  //$NON-NLS-1$
-	final static String ELEMENT_REFERENCE = "reference";  //$NON-NLS-1$
-	private String fProjectName;
-	private String fCfgId;
-	private CExternalSettingProvider fProvider;
-	private boolean fIsSynchronized;
-	
-	ProjectRefInfo(ICStorageElement el){
-		fProjectName = el.getAttribute(ATTRIBUTE_REF_PROJECT);
-		fCfgId = el.getAttribute(ATTRIBUTE_REF_CFG_ID);
-		if(fCfgId == null)
-			fCfgId = "";  //$NON-NLS-1$
-		
-		ICStorageElement children[] = el.getChildren();
-		for(int i = 0; i < children.length; i++){
-			ICStorageElement child = children[i];
-			String name = child.getName();
-			if(CExternalSettingProvider.ELEMENT_EXT_SETTINGS_CONTAINER.equals(name)){
-				fProvider = new CExternalSettingProvider(child);
-			}
-		}
-	}
-
-	ProjectRefInfo(String projName, String cfgId){
-		fProjectName = projName;
-		fCfgId = cfgId;
-	}
-
-	ProjectRefInfo(ProjectRefInfo base){
-		fProjectName = base.fProjectName;
-		fCfgId = base.fCfgId;
-		
-		if(base.fProvider != null)
-			fProvider = new CExternalSettingProvider(base.fProvider);
-		
-		fIsSynchronized = base.fIsSynchronized;
-	}
-	
-	void serialize(ICStorageElement element){
-		element.setAttribute(ATTRIBUTE_REF_PROJECT, fProjectName);
-		if(fCfgId.length() != 0)
-			element.setAttribute(ATTRIBUTE_REF_CFG_ID, fCfgId);
-
-		if(fProvider != null){
-			ICStorageElement child = element.createChild(CExternalSettingProvider.ELEMENT_EXT_SETTINGS_CONTAINER);
-			fProvider.serialize(child);
-		}
-	}
-
-	public String getProjectName() {
-		return fProjectName;
-	}
-
-	public String getCfgId() {
-		return fCfgId;
-	}
-
-	public CExternalSettingProvider getProvider() {
-		if(fProvider == null)
-			fProvider = new CExternalSettingProvider();
-		return fProvider;
-	}
-
-	public void setProvider(CExternalSettingProvider provider) {
-		fProvider = provider;
-	}
-	
-	public boolean isSynchronized(){
-		return fIsSynchronized;
-	}
-	
-	public void setSynchronized(boolean s){
-		fIsSynchronized = s;
-	}
-
-}
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/SetCProjectDescriptionOperation.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/SetCProjectDescriptionOperation.java
index 34b619cd20b..c63c19019ee 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/SetCProjectDescriptionOperation.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/SetCProjectDescriptionOperation.java
@@ -100,7 +100,7 @@ public class SetCProjectDescriptionOperation extends CModelOperation {
 		
 		cProject.close();
 		
-		ExternalSettingsManager.getInstance().updateDepentents(delta);
+//		ExternalSettingsManager.getInstance().updateDepentents(delta);
 		
 		try {
 			((InternalXmlStorageElement)fNewDescriptionCache.getRootStorageElement()).setReadOnly(true);
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractExportTab.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractExportTab.java
index fa13f209e35..1c06b321782 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractExportTab.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractExportTab.java
@@ -146,7 +146,7 @@ public abstract class AbstractExportTab extends AbstractCPropertyTab {
 		boolean x = i != -1;
 		boolean y = x;
 		if (x) {
-			ICLanguageSettingEntry ent = ((ExtData)(table.getItem(i).getData())).entry;
+			ICSettingEntry ent = ((ExtData)(table.getItem(i).getData())).entry;
 			if (ent.isReadOnly()) x = false;
 			if (ent.isBuiltIn() || ent.isReadOnly()) y = false;
 		}
@@ -179,7 +179,7 @@ public abstract class AbstractExportTab extends AbstractCPropertyTab {
 			return;
 		}
 		for (int i=0; i<vals.length; i++) {
-			ICLanguageSettingEntry[] ents = vals[i].getEntries(getKind());
+			ICSettingEntry[] ents = vals[i].getEntries(getKind());
 			if (ents == null || ents.length == 0) continue;
 			for (int j=0; j<ents.length; j++) {
 				lst.add(new ExtData(vals[i], ents[j]));
@@ -249,8 +249,8 @@ public abstract class AbstractExportTab extends AbstractCPropertyTab {
 					getKind(), names_ls, names_ts, null, isWsp); 
 			if (dlg.open()) {
 				ent[0] = doEdit(dlg.text1.trim(), dlg.text2.trim(), dlg.check2);
-				ICLanguageSettingEntry[] ls = old.setting.getEntries(getKind());
-				ICLanguageSettingEntry[] ls2 = new ICLanguageSettingEntry[ls.length];
+				ICSettingEntry[] ls = old.setting.getEntries(getKind());
+				ICSettingEntry[] ls2 = new ICLanguageSettingEntry[ls.length];
 				for (int x=0; x<ls.length; x++) 
 					if (ls[x].equals(old.entry)) ls2[x] = ent[0];
 					else ls2[x] = ls[x];
@@ -268,7 +268,7 @@ public abstract class AbstractExportTab extends AbstractCPropertyTab {
 				if (checked[t] || its[t] == null) continue;
 				old = (ExtData)(its[t].getData());
 				if (old.entry.isReadOnly() || old.entry.isBuiltIn()) continue;
-				ICLanguageSettingEntry[] ls = old.setting.getEntries(getKind());
+				ICSettingEntry[] ls = old.setting.getEntries(getKind());
 				ArrayList lst = new ArrayList();
 outer:				
 				for (int x=0; x<ls.length; x++) { 
@@ -401,9 +401,9 @@ outer:
 	 */
 	static class ExtData {
 		ICExternalSetting setting;
-		ICLanguageSettingEntry entry;
+		ICSettingEntry entry;
 		
-		ExtData(ICExternalSetting _s, ICLanguageSettingEntry _e) {
+		ExtData(ICExternalSetting _s, ICSettingEntry _e) {
 			setting = _s;
 			entry = _e;
 		}
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractLangsListTab.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractLangsListTab.java
index 9886fdfbd8a..60b1c939feb 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractLangsListTab.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractLangsListTab.java
@@ -316,7 +316,7 @@ public abstract class AbstractLangsListTab extends AbstractCPropertyTab {
 		ICExternalSetting[] vals = getResDesc().getConfiguration().getExternalSettings();
 		if (!(vals == null || vals.length == 0)) {
 			for (int i=0; i<vals.length; i++) {
-				ICLanguageSettingEntry[] ents = vals[i].getEntries(getKind());
+				ICSettingEntry[] ents = vals[i].getEntries(getKind());
 				if (ents == null || ents.length == 0) continue;
 				for (int j=0; j<ents.length; j++)
 					exported.add(ents[j]);