Move Index and IndexStore implementations into Engine.

pkg/analysis_server/lib/src/index/store/separate_file_manager.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 index.store.separate_file_mananer;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:analysis_server/src/index/store/split_store.dart';
-import 'package:path/path.dart' as pathos;
-
-
-/**
- * An implementation of [FileManager] that keeps each file in a separate file
- * system file.
- */
-class SeparateFileManager implements FileManager {
-  final Directory _directory;
-
-  SeparateFileManager(this._directory) {
-    clear();
-  }
-
-  @override
-  void clear() {
-    List<FileSystemEntity> entries = _directory.listSync();
-    for (FileSystemEntity entry in entries) {
-      entry.deleteSync(recursive: true);
-    }
-  }
-
-  @override
-  void delete(String name) {
-    File file = _getFile(name);
-    try {
-      file.deleteSync();
-    } catch (e) {
-    }
-  }
-
-  @override
-  Future<List<int>> read(String name) {
-    File file = _getFile(name);
-    return file.readAsBytes().catchError((e) {
-      return null;
-    });
-  }
-
-  @override
-  Future write(String name, List<int> bytes) {
-    return _getFile(name).writeAsBytes(bytes);
-  }
-
-  File _getFile(String name) {
-    String path = pathos.join(_directory.path, name);
-    return new File(path);
-  }
-}