Declare IndexableObject.file instead of Source.

pkg/analysis_server/lib/plugin/index/index_core.dart

 // Copyright (c) 2015, 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 analysis_server.plugin.index.index_core;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/services/index/index.dart';
@@ skipping 16 matching lines @@
  * a [source].
  *
  * Clients must ensure that two distinct objects in the same source cannot have
  * the same kind and offset. Failure to do so will make it impossible for
  * clients to identify the model element corresponding to the indexable object.
  *
  * Clients are expected to subtype this class when implementing plugins.
  */
 abstract class IndexableObject {
   /**
+   * Return the absolute path of the file containing the indexable object.
+   */
+  String get file;

[Brian Wilkerson, 2015/10/16 20:47:37]

I'd prefer filePath given that there are several classes named File and this
doesn't use any of them.

+
+  /**
    * Return the kind of this object.
    */
   IndexableObjectKind get kind;
 
   /**
    * Return the offset of the indexable object within its source.
    */
   int get offset;
-
-  /**
-   * Return the source containing the indexable object.
-   */
-  Source get source;
 }
 
 /**
  * The kind associated with an [IndexableObject].
  *
  * Clients are expected to implement this class when implementing plugins.
  */
 abstract class IndexableObjectKind {
   /**
    * The next available index for a newly created kind of indexable object.
@@ skipping 211 matching lines @@
  */
 abstract class Relationship {
   /**
    * Return a relationship that has the given [identifier]. If the relationship
    * has already been created, then it will be returned, otherwise a new
    * relationship will be created
    */
   factory Relationship(String identifier) =>
       RelationshipImpl.getRelationship(identifier);
 }