Index library/part file references from import/export/part containing files.

pkg/analysis_server/lib/src/services/index/indexable_file.dart

Index: pkg/analysis_server/lib/src/services/index/indexable_file.dart
diff --git a/pkg/analysis_server/lib/src/services/index/indexable_file.dart b/pkg/analysis_server/lib/src/services/index/indexable_file.dart
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index 0000000000000000000000000000000000000000..36e3eeae96a213ba55d2f12b6b5a91e3525f1c71
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+++ b/pkg/analysis_server/lib/src/services/index/indexable_file.dart
@@ -0,0 +1,74 @@
+// 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 services.index.indexable_file;
+
+import 'package:analysis_server/plugin/index/index_core.dart';
+import 'package:analyzer/src/generated/engine.dart';
+
+/**
+ * An [IndexableObject] which is used to index references to a file.
+ */
+class IndexableFile implements IndexableObject {
+  /**
+   * The path of the file to be indexed.
+   */
+  @override
+  final String path;
+
+  /**
+   * Initialize a newly created indexable file to represent the given [path].
+   */
+  IndexableFile(this.path);
+
+  @override
+  String get filePath => path;
+
+  @override
+  IndexableObjectKind get kind => IndexableFileKind.INSTANCE;
+
+  @override
+  int get offset => -1;
+
+  @override
+  bool operator ==(Object object) =>
+      object is IndexableFile && object.path == path;
+
+  @override
+  String toString() => path;
+}
+
+/**
+ * The kind of an indexable file.
+ */
+class IndexableFileKind implements IndexableObjectKind {
+  /**
+   * The unique instance of this class.
+   */
+  static final IndexableFileKind INSTANCE =
+      new IndexableFileKind._(IndexableObjectKind.nextIndex);
+
+  /**
+   * The index uniquely identifying this kind.
+   */
+  final int index;
+
+  /**
+   * Initialize a newly created kind to have the given [index].
+   */
+  IndexableFileKind._(this.index) {
+    IndexableObjectKind.register(this);
+  }
+
+  @override
+  IndexableObject decode(AnalysisContext context, String filePath, int offset) {
+    return new IndexableFile(filePath);
+  }
+
+  @override
+  int encodeHash(StringToInt stringToInt, IndexableObject indexable) {
+    String path = (indexable as IndexableFile).path;
+    return stringToInt(path);
+  }
+}