Move SourceReference, extract duplicate code.

pkg/analysis_server/lib/src/services/refactoring/rename_constructor.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.src.refactoring.rename_constructor;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/status.dart';
+import 'package:analysis_server/src/services/correction/util.dart';
+import 'package:analysis_server/src/services/refactoring/naming_conventions.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
+import 'package:analysis_server/src/services/refactoring/refactoring_internal.dart';
+import 'package:analysis_server/src/services/refactoring/rename.dart';
 import 'package:analysis_server/src/services/search/hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
-import 'package:analysis_server/src/services/correction/util.dart';
-import 'package:analysis_server/src/services/refactoring/naming_conventions.dart';
-import 'package:analysis_server/src/services/refactoring/rename.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 
 
 /**
  * A [Refactoring] for renaming [ConstructorElement]s.
  */
 class RenameConstructorRefactoringImpl extends RenameRefactoringImpl {
   RenameConstructorRefactoringImpl(SearchEngine searchEngine,
       ConstructorElement element)
@@ skipping 15 matching lines @@
   }
 
   @override
   RefactoringStatus checkNewName() {
     RefactoringStatus result = super.checkNewName();
     result.addStatus(validateConstructorName(newName));
     return result;
   }
 
   @override
-  Future<SourceChange> createChange() {
-    SourceChange change = new SourceChange(refactoringName);
+  Future fillChange() {
     String replacement = newName.isEmpty ? '' : '.${newName}';
     // update references
-    return searchEngine.searchReferences(element).then((refMatches) {
-      List<SourceReference> references = getSourceReferences(refMatches);
+    return searchEngine.searchReferences(element).then((matches) {
+      List<SourceReference> references = getSourceReferences(matches);
       if (!element.isSynthetic) {
         for (SourceReference reference in references) {
-          SourceEdit edit = createReferenceEdit(reference, replacement);
-          change.addElementEdit(reference.element, edit);
+          reference.addEdit(change, replacement);
         }
       }
-      return change;
     });
   }
 
   void _analyzePossibleConflicts(RefactoringStatus result) {
     // check if there are members with "newName" in the same ClassElement
     ClassElement parentClass = element.enclosingElement;
     for (Element newNameMember in getChildren(parentClass, newName)) {
       String message =
           format(
               "Class '{0}' already declares {1} with name '{2}'.",
               parentClass.displayName,
               getElementKindName(newNameMember),
               newName);
       result.addError(
           message,
           new Location.fromElement(newNameMember));
     }
   }
 }