Added @noextend to HashTable and its subclasses.

Change-Id: I89a5e887cd22e4cb79b96c549fe5c7b79045cf3b

core/org.eclipse.cdt.core/.settings/.api_filters

@@ -1,13 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <component id="org.eclipse.cdt.core" version="2">
-    <resource path="parser/org/eclipse/cdt/core/parser/util/HashTable.java" type="org.eclipse.cdt.core.parser.util.HashTable">
-        <filter id="421654647">
-            <message_arguments>
-                <message_argument value="org.eclipse.cdt.core.parser.util.HashTable"/>
-                <message_argument value="linkIntoHashTable(int, int)"/>
-            </message_arguments>
-        </filter>
-    </resource>
     <resource path="utils/org/eclipse/cdt/utils/BinaryObjectAdapter.java" type="org.eclipse.cdt.utils.BinaryObjectAdapter">
         <filter comment="NO_SYMBOLS array should be final" id="388100214">
             <message_arguments>

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/CharArrayIntMap.java

@@ -13,9 +13,9 @@ package org.eclipse.cdt.core.parser.util;
 
 /**
  * @author Doug Schaefer
+ * @noextend This class is not intended to be subclassed by clients.
  */
 public class CharArrayIntMap extends CharTable {
-
 	private int[] valueTable;
 	public final int undefined;
 

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/CharArrayObjectMap.java

@@ -24,8 +24,12 @@ import java.util.function.Consumer;
 
 /**
  * @author Doug Schaefer
+ * @noextend This class is not intended to be subclassed by clients.
  */
 public class CharArrayObjectMap<T> extends CharTable {
+	/**
+	 * An empty immutable {@code CharArrayObjectMap}.
+	 */
     public static final CharArrayObjectMap<?> EMPTY_MAP = new CharArrayObjectMap<Object>(0) {
         @Override
 		public Object clone() { return this; }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/CharArraySet.java

@@ -13,8 +13,13 @@ package org.eclipse.cdt.core.parser.util;
 import java.util.Collections;
 import java.util.List;
 
+/**
+ * @noextend This class is not intended to be subclassed by clients.
+ */
 public class CharArraySet extends CharTable {
-	
+	/**
+	 * An empty immutable {@code CharArraySet}.
+	 */
     public static final CharArraySet EMPTY_SET = new CharArraySet(0) {
         @Override
 		public Object clone() { return this; }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/CharTable.java

@@ -18,6 +18,7 @@ import java.util.List;
 
 /**
  * @author ddaoust
+ * @noextend This class is not intended to be subclassed by clients.
  */
 public class CharTable extends HashTable {
 	protected char[][] keyTable;

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/HashTable.java

@@ -15,6 +15,7 @@ import java.util.Comparator;
 
 /**
  * @author ddaoust
+ * @noextend This class is not intended to be subclassed by clients.
  */
 public class HashTable implements Cloneable {
 	// Prime numbers from http://planetmath.org/goodhashtableprimes

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ObjectMap.java

@@ -15,7 +15,13 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
+/**
+ * @noextend This class is not intended to be subclassed by clients.
+ */
 public class ObjectMap extends ObjectTable<Object> {
+	/**
+	 * An empty immutable {@code ObjectMap}.
+	 */
     public static final ObjectMap EMPTY_MAP = new ObjectMap(0) {
         @Override
 		public Object clone() { return this; }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ObjectSet.java

@@ -13,9 +13,12 @@ package org.eclipse.cdt.core.parser.util;
 import java.util.Collections;
 import java.util.List;
 
+/**
+ * @noextend This class is not intended to be subclassed by clients.
+ */
 public class ObjectSet<T> extends ObjectTable<T> {
 	/**
-	 * Represents the empty ObjectSet
+	 * An empty immutable {@code ObjectSet}.
 	 */
 	@SuppressWarnings("rawtypes")
     public static final ObjectSet EMPTY_SET = new ObjectSet(0) {

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/parser/util/ObjectTable.java

@@ -18,6 +18,9 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.NoSuchElementException;
 
+/**
+ * @noextend This class is not intended to be subclassed by clients.
+ */
 public abstract class ObjectTable<T> extends HashTable implements Iterable<T> {
 	protected T[] keyTable;