Implement SearchEngine.searchAllSubtypes() with the analysis driver.

pkg/analysis_server/lib/src/services/search/hierarchy.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 services.hierarchy;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/services/search/element_visitors.dart';
@@ skipping 69 matching lines @@
   ClassElement memberClass = member.enclosingElement;
   Set<ClassElement> searchClasses = getSuperClasses(memberClass);
   searchClasses.add(memberClass);
   for (ClassElement superClass in searchClasses) {
     // ignore if super- class does not declare member
     if (getClassMembers(superClass, name).isEmpty) {
       continue;
     }
     // check all sub- classes
     Set<ClassElement> subClasses =
-        await getSubClasses(searchEngine, superClass);
+        await searchEngine.searchAllSubtypes(superClass);
     subClasses.add(superClass);
     for (ClassElement subClass in subClasses) {
       List<Element> subClassMembers = getChildren(subClass, name);
       for (Element member in subClassMembers) {
         if (member is ClassMemberElement) {
           result.add(member);
         }
       }
     }
   }
@@ skipping 11 matching lines @@
   List<Element> members = <Element>[];
   members.addAll(getClassMembers(clazz));
   Set<ClassElement> superClasses = getSuperClasses(clazz);
   for (ClassElement superClass in superClasses) {
     members.addAll(getClassMembers(superClass));
   }
   return members;
 }
 
 /**
- * Returns a [Set] with all direct and indirect subclasses of [seed].
- */
-Future<Set<ClassElement>> getSubClasses(
-    SearchEngine searchEngine, ClassElement seed) async {
-  List<SearchMatch> matches = await searchEngine.searchAllSubtypes(seed);
-  return matches.map((match) => match.element).toSet();
-}
-
-/**
  * Returns a [Set] with all direct and indirect superclasses of [seed].
  */
 Set<ClassElement> getSuperClasses(ClassElement seed) {
   Set<ClassElement> result = new HashSet<ClassElement>();
   // prepare queue
   List<ClassElement> queue = new List<ClassElement>();
   queue.add(seed);
   // process queue
   while (!queue.isEmpty) {
     ClassElement current = queue.removeLast();
@@ skipping 23 matching lines @@
  * its variable, otherwise returns [element].
  */
 Element getSyntheticAccessorVariable(Element element) {
   if (element is PropertyAccessorElement) {
     if (element.isSynthetic) {
       return element.variable;
     }
   }
   return element;
 }