Implementation of the 'search.getTypeHierarchy' API.

pkg/analysis_server/lib/src/search/search_domain.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 search.domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/element.dart' as se;
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/search/element_references.dart';
 import 'package:analysis_server/src/search/search_result.dart';
+import 'package:analysis_server/src/search/type_hierarchy.dart';
 import 'package:analysis_services/constants.dart';
 import 'package:analysis_services/search/search_engine.dart';
 import 'package:analyzer/src/generated/element.dart';
 
 /**
  * Instances of the class [SearchDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
  */
 class SearchDomainHandler implements RequestHandler {
   /**
@@ skipping 94 matching lines @@
     {
       var matchesFuture = searchEngine.searchTopLevelDeclarations(pattern);
       matchesFuture.then((List<SearchMatch> matches) {
         _sendSearchNotification(searchId, true, matches.map(toResult));
       });
     }
     // respond
     return new Response(request.id)..setResult(ID, searchId);
   }
 
+  /**
+   * Implement the `search.getTypeHierarchy` request.
+   */
+  Response getTypeHierarchy(Request request) {
+    // prepare parameters
+    String file = request.getRequiredParameter(FILE).asString();
+    int offset = request.getRequiredParameter(OFFSET).asInt();
+    // prepare Element
+    List<Element> elements = server.getElementsAtOffset(file, offset);
+    if (elements.isEmpty) {
+      return new Response(request.id);
+    }
+    Element element = elements.first;
+    // prepare type hierarchy
+    TypeHierarchyComputer computer = new TypeHierarchyComputer(searchEngine);
+    computer.compute(element).then((TypeHierarchyItem item) {
+      Response response = new Response(request.id);
+      response.setResult(HIERARCHY, item);
+      server.sendResponse(response);
+    });
+    // delay response
+    return Response.DELAYED_RESPONSE;
+  }
+
   @override
   Response handleRequest(Request request) {
     try {
       String requestName = request.method;
       if (requestName == SEARCH_FIND_ELEMENT_REFERENCES) {
         return findElementReferences(request);
       } else if (requestName == SEARCH_FIND_MEMBER_DECLARATIONS) {
         return findMemberDeclarations(request);
       } else if (requestName == SEARCH_FIND_MEMBER_REFERENCES) {
         return findMemberReferences(request);
       } else if (requestName == SEARCH_FIND_TOP_LEVEL_DECLARATIONS) {
         return findTopLevelDeclarations(request);
+      } else if (requestName == SEARCH_GET_TYPE_HIERARCHY) {
+        return getTypeHierarchy(request);
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 
   void _sendSearchNotification(String searchId, bool isLast,
       Iterable<SearchResult> results) {
     Notification notification = new Notification(SEARCH_RESULTS);
     notification.setParameter(ID, searchId);
     notification.setParameter(LAST, isLast);
     notification.setParameter(RESULTS, results);
     server.sendNotification(notification);
   }
 
   static SearchResult toResult(SearchMatch match) {
     return new SearchResult.fromMatch(match);
   }
 }