Bug 535632. Set a cache directory for CQuery LS

Change-Id: I80b88f48207b5091fe1c634c730a8fd6983f40b9
Signed-off-by: Manish Khurana <mkmanishkhurana98@gmail.com>

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/META-INF/MANIFEST.MF

@@ -16,7 +16,8 @@ Require-Bundle: org.apache.commons.io,
  org.eclipse.lsp4j,
  org.eclipse.core.commands,
  org.eclipse.core.expressions,
- org.eclipse.core.resources
+ org.eclipse.core.resources,
+ com.google.gson;bundle-version="2.8.2"
 Bundle-Vendor: %Bundle-Vendor
 Export-Package: org.eclipse.lsp4e.cpp.language
 Bundle-Activator: org.eclipse.lsp4e.cpp.language.Activator

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/plugin.xml

@@ -14,7 +14,7 @@
    <extension
          point="org.eclipse.lsp4e.languageServer">
       <server
-            class="org.eclipse.lsp4e.cpp.language.CPPLanguageServer"
+            class="org.eclipse.lsp4e.cpp.language.CPPStreamConnectionProvider"
             id="org.eclipse.lsp4e.languages.cpp"
             label="%server.label">
       </server>

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CPPLanguageServerPreferencePage.java

@@ -31,9 +31,10 @@ public class CPPLanguageServerPreferencePage extends FieldEditorPreferencePage i
 	@Override
 	public void createFieldEditors() {
 
-		serverChoice = new RadioGroupFieldEditor(PreferenceConstants.P_SERVER_CHOICE,
+		serverChoice = new RadioGroupFieldEditor(PreferenceConstants.P_SERVER_CHOICE, Messages.ServerChoiceLabel, 1,
-				Messages.ServerChoiceLabel, 1,
+				new String[][] { { "ClangD", CPPStreamConnectionProvider.CLANGD_ID }, //$NON-NLS-1$
-				new String[][] { { "ClangD", "clangd" }, { "CQuery", "cquery" } }, getFieldEditorParent()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+						{ "CQuery", CPPStreamConnectionProvider.CQUERY_ID } }, //$NON-NLS-1$
+				getFieldEditorParent());
 		addField(serverChoice);
 
 		serverPath = new FileFieldEditor(PreferenceConstants.P_SERVER_PATH, Messages.ServerPathLabel,

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CPPResourceChangeListener.java

@@ -42,7 +42,7 @@ final class CPPResourceChangeListener implements IResourceChangeListener {
 
 	@Override
 	public void resourceChanged(IResourceChangeEvent event) {
-		LanguageServerDefinition definition = LanguageServersRegistry.getInstance().getDefinition(CPPLanguageServer.ID);
+		LanguageServerDefinition definition = LanguageServersRegistry.getInstance().getDefinition(CPPStreamConnectionProvider.ID);
 		ProjectSpecificLanguageServerWrapper wrapper = getLanguageSeverWrapper(definition);
 		if (event.getType() != IResourceChangeEvent.POST_CHANGE || !isRelevantDelta(event.getDelta())
 				|| wrapper == null) {

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CPPStreamConnectionProvider.java

@@ -25,7 +25,8 @@ import org.eclipse.core.runtime.Platform;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.lsp4e.server.ProcessStreamConnectionProvider;
 
-public class CPPLanguageServer extends ProcessStreamConnectionProvider {
+
+public class CPPStreamConnectionProvider extends ProcessStreamConnectionProvider {
 
 	public static final String ID = "org.eclipse.lsp4e.languages.cpp"; //$NON-NLS-1$
 
@@ -33,8 +34,21 @@ public class CPPLanguageServer extends ProcessStreamConnectionProvider {
 
 	private static final IPreferenceStore store = Activator.getDefault().getPreferenceStore();
 
-	public CPPLanguageServer() {
+	private ICPPLanguageServer languageServer;
+
+	public static final String CLANGD_ID = "clangd"; //$NON-NLS-1$
+
+	public static final String CQUERY_ID = "cquery"; //$NON-NLS-1$
+
+	public CPPStreamConnectionProvider() throws UnsupportedOperationException {
 		List<String> commands = new ArrayList<>();
+		if (store.getString(PreferenceConstants.P_SERVER_CHOICE).equals(CQUERY_ID)) {
+			languageServer = new CqueryLanguageServer();
+		} else if (store.getString(PreferenceConstants.P_SERVER_CHOICE).equals(CLANGD_ID)) {
+			languageServer = new ClangdLanguageServer();
+		} else {
+			throw new UnsupportedOperationException("Unsupported Language Server"); //$NON-NLS-1$
+		}
 		File defaultLSLocation = getDefaultLSLocation(store.getString(PreferenceConstants.P_SERVER_CHOICE));
 		if(defaultLSLocation != null) {
 			store.setDefault(PreferenceConstants.P_SERVER_PATH, defaultLSLocation.getAbsolutePath());
@@ -65,7 +79,8 @@ public class CPPLanguageServer extends ProcessStreamConnectionProvider {
 	@Override
 	public Object getInitializationOptions(URI rootPath) {
 		installResourceChangeListener(rootPath);
-		return super.getInitializationOptions(rootPath);
+		Object defaultInitOptions = super.getInitializationOptions(rootPath);
+		return languageServer.getLSSpecificInitializationOptions(defaultInitOptions, rootPath);
 	}
 
 	private void installResourceChangeListener(URI rootPath) {

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/ClangdLanguageServer.java

@@ -0,0 +1,20 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge 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
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import java.net.URI;
+
+public class ClangdLanguageServer implements ICPPLanguageServer {
+
+	@Override
+	public Object getLSSpecificInitializationOptions(Object defaultInitOptions, URI rootPath) {
+		return defaultInitOptions;
+	}
+
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CqueryLanguageServer.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge 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
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import java.net.URI;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.Path;
+import com.google.gson.JsonObject;
+
+public class CqueryLanguageServer implements ICPPLanguageServer {
+
+	@Override
+	public Object getLSSpecificInitializationOptions(Object defaultInitOptions, URI rootPath) {
+//		TODO: Allow user to specify cache directory path
+		IPath cacheDirectory = Path.fromOSString(rootPath.getPath()).append(".cquery/cquery_index"); //$NON-NLS-1$
+		JsonObject result = (defaultInitOptions instanceof JsonObject) ? (JsonObject) defaultInitOptions : new JsonObject();
+		result.addProperty("cacheDirectory", cacheDirectory.toString()); //$NON-NLS-1$
+		return result;
+	}
+
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/ICPPLanguageServer.java

@@ -0,0 +1,19 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge 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
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import java.net.URI;
+/*
+ * Encapsulates functionality specific to a particular C++ language server (e.g., CQuery)
+ */
+public interface ICPPLanguageServer {
+
+	public Object getLSSpecificInitializationOptions(Object defaultInitOptions, URI rootPath) ;
+
+}