Use HasToJson when set Reponse/Notification parameters.

pkg/analysis_server/lib/src/computer/computer_outline.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.outline;
 
+import 'package:analysis_server/src/collections.dart';
 import 'package:analysis_server/src/computer/element.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart' as engine;
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 
 /**
  * A computer for [CompilationUnit] outline.
  */
 class DartUnitOutlineComputer {
   final CompilationUnit _unit;
   String file;
   LineInfo lineInfo;
 
   DartUnitOutlineComputer(AnalysisContext context, Source source, this._unit) {
     file = source.fullName;
     lineInfo = context.getLineInfo(source);
   }
 
   /**
    * Returns the computed outline, not `null`.
    */
-  Map<String, Object> compute() {
+  Outline compute() {
     Outline unitOutline = _newUnitOutline();
     for (CompilationUnitMember unitMember in _unit.declarations) {
       if (unitMember is ClassDeclaration) {
         ClassDeclaration classDeclaration = unitMember;
         Outline classOutline = _newClassOutline(unitOutline, classDeclaration);
         for (ClassMember classMember in classDeclaration.members) {
           if (classMember is ConstructorDeclaration) {
             ConstructorDeclaration constructorDeclaration = classMember;
             _newConstructorOutline(classOutline, constructorDeclaration);
           }
@@ skipping 34 matching lines @@
       }
       if (unitMember is ClassTypeAlias) {
         ClassTypeAlias alias = unitMember;
         _newClassTypeAlias(unitOutline, alias);
       }
       if (unitMember is FunctionTypeAlias) {
         FunctionTypeAlias alias = unitMember;
         _newFunctionTypeAliasOutline(unitOutline, alias);
       }
     }
-    return unitOutline.toJson();
+    return unitOutline;
   }
 
   void _addLocalFunctionOutlines(Outline parent, FunctionBody body) {
     body.accept(new _LocalFunctionOutlinesVisitor(this, parent));
   }
 
   Location _getLocationNode(AstNode node) {
     int offset = node.offset;
     int length = node.length;
     return _getLocationOffsetLength(offset, length);
@@ skipping 199 matching lines @@
   static bool _isDeprecated(Declaration declaration) {
     engine.Element element = declaration.element;
     return element != null && element.isDeprecated;
   }
 }
 
 
 /**
  * An element outline.
  */
-class Outline {
+class Outline implements HasToJson {
   static const List<Outline> EMPTY_ARRAY = const <Outline>[];
 
   /**
    * The children of the node.
    * The field will be omitted in JSON if the node has no children.
    */
   final List<Outline> children = <Outline>[];
 
   /**
    * A description of the element represented by this node.
@@ skipping 57 matching lines @@
 
 
 /**
  * A range of characters.
  */
 class _SourceRegion {
   final int length;
   final int offset;
   _SourceRegion(this.offset, this.length);
 }