Change Maps to HashMaps to save in performance, index and generated directories not touched

pkg/analysis_server/lib/src/computer/computer_navigation.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 computer.navigation;
 
+import 'dart:collection';
+
 import 'package:analysis_server/src/constants.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 import 'element.dart' as computer;
 
 
 /**
  * A computer for navigation regions in a Dart [CompilationUnit].
  */
 class DartUnitNavigationComputer {
   final CompilationUnit _unit;
 
-  final List<Map<String, Object>> _regions = <Map<String, Object>>[];
+  final List<HashMap<String, Object>> _regions = <HashMap<String, Object>>[];
 
   DartUnitNavigationComputer(this._unit);
 
   /**
    * Returns the computed navigation regions, not `null`.
    */
-  List<Map<String, Object>> compute() {
+  List<HashMap<String, Object>> compute() {
     _unit.accept(new _DartUnitNavigationComputerVisitor(this));
     return new List.from(_regions);
   }
 
   void _addRegion(int offset, int length, Element element) {
-    Map<String, Object> target = _createTarget(element);
+    HashMap<String, Object> target = _createTarget(element);
     if (target == null) {
       return;
     }
     _regions.add({
       OFFSET: offset,
       LENGTH: length,
       TARGETS: [target]
     });
   }
 
@@ skipping 23 matching lines @@
 
   void _addRegion_tokenStart_nodeEnd(Token a, AstNode b, Element element) {
     int offset = a.offset;
     int length = b.end - offset;
     _addRegion(offset, length, element);
   }
 
   /**
    * Returns the JSON for the given [Element], maybe `null` if `null` was given.
    */
-  Map<String, Object> _createTarget(Element element) {
+  HashMap<String, Object> _createTarget(Element element) {
     if (element == null) {
       return null;
     }
     if (element is FieldFormalParameterElement) {
       element = (element as FieldFormalParameterElement).field;
     }
     // prepare Source
     Source source = element.source;
     if (source == null) {
       return null;
@@ skipping 115 matching lines @@
 
   @override
   visitSimpleIdentifier(SimpleIdentifier node) {
     if (node.parent is ConstructorDeclaration) {
     } else {
       computer._addRegionForNode(node, node.bestElement);
     }
     return super.visitSimpleIdentifier(node);
   }
 }