'Rename Import Prefix' refactoring.

pkg/analysis_services/lib/refactoring/refactoring.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.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_services/correction/change.dart';
 import 'package:analysis_services/correction/status.dart';
 import 'package:analysis_services/search/search_engine.dart';
+import 'package:analysis_services/src/refactoring/rename_import.dart';
 import 'package:analysis_services/src/refactoring/rename_library.dart';
 import 'package:analysis_services/src/refactoring/rename_local.dart';
 import 'package:analyzer/src/generated/element.dart';
 
 
 /**
  * Abstract interface for all refactorings.
  */
 abstract class Refactoring {
   /**
@@ skipping 37 matching lines @@
 /**
  * Abstract [Refactoring] for renaming some [Element].
  */
 abstract class RenameRefactoring implements Refactoring {
   /**
    * Returns a new [RenameRefactoring] instance for renaming [element],
    * maybe `null` if there is no support for renaming [Element]s of the given
    * type.
    */
   factory RenameRefactoring(SearchEngine searchEngine, Element element) {
+    if (element is ImportElement) {
+      return new RenameImportRefactoringImpl(searchEngine, element);
+    }
     if (element is LibraryElement) {
       return new RenameLibraryRefactoringImpl(searchEngine, element);
     }
     if (element is LocalElement) {
       return new RenameLocalRefactoringImpl(searchEngine, element);
     }
     return null;
   }
 
   /**
@@ skipping 10 matching lines @@
    * Validates that the [newName] is a valid identifier and is appropriate for
    * the type of the [Element] being renamed.
    *
    * It does not perform all the checks (such as checking for conflicts with any
    * existing names in any of the scopes containing the current name), as many
    * of these checkes require search engine. Use [checkFinalConditions] for this
    * level of checking.
    */
   RefactoringStatus checkNewName();
 }