Return RequestErrorCode.NO_INDEX_GENERATED if no index.

pkg/analysis_server/lib/src/domain_completion.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library domain.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 10 matching lines @@
  * Instances of the class [CompletionDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
  */
 class CompletionDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
 
   /**
+   * The [SearchEngine] for this server.
+   */
+  SearchEngine searchEngine;
+
+  /**
    * The next completion response id.
    */
   int _nextCompletionId = 0;
 
   /**
    * The completion manager for most recent [Source] and [AnalysisContext],
    * or `null` if none.
    */
   CompletionManager _manager;
 
@@ skipping 23 matching lines @@
    * Performance for the last priority change event.
    */
   CompletionPerformance computeCachePerformance;
 
   /**
    * Initialize a new request handler for the given [server].
    */
   CompletionDomainHandler(this.server) {
     server.onContextsChanged.listen(contextsChanged);
     server.onPriorityChange.listen(priorityChanged);
+    searchEngine = server.searchEngine;
   }
 
   /**
    * Return the completion manager for most recent [Source] and [AnalysisContext],
    * or `null` if none.
    */
   CompletionManager get manager => _manager;
 
   /**
    * Return the [CompletionManager] for the given [context] and [source],
    * creating a new manager or returning an existing manager as necessary.
    */
   CompletionManager completionManagerFor(AnalysisContext context,
       Source source) {
     if (_manager != null) {
       if (_manager.context == context && _manager.source == source) {
         return _manager;
       }
       _discardManager();
     }
-    _manager = createCompletionManager(context, source, server.searchEngine);
+    _manager = createCompletionManager(context, source, searchEngine);
     if (context != null) {
       _sourcesChangedSubscription =
           context.onSourcesChanged.listen(sourcesChanged);
     }
     return _manager;
   }
 
   /**
    * If the context associated with the cache has changed or been removed
    * then discard the cache.
    */
   void contextsChanged(ContextsChangedEvent event) {
     if (_manager != null) {
       AnalysisContext context = _manager.context;
       if (event.changed.contains(context) || event.removed.contains(context)) {
         _discardManager();
       }
     }
   }
 
   CompletionManager createCompletionManager(AnalysisContext context,
       Source source, SearchEngine searchEngine) {
     return new CompletionManager.create(context, source, searchEngine);
   }
 
   @override
   Response handleRequest(Request request) {
+    if (searchEngine == null) {
+      return new Response.noIndexGenerated(request);
+    }
     try {
       String requestName = request.method;
       if (requestName == COMPLETION_GET_SUGGESTIONS) {
         return processRequest(request);
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
@@ skipping 132 matching lines @@
     if (_sourcesChangedSubscription != null) {
       _sourcesChangedSubscription.cancel();
       _sourcesChangedSubscription = null;
     }
     if (_manager != null) {
       _manager.dispose();
       _manager = null;
     }
   }
 }