A FileManager implementation to keep each index file in a separate file system file.

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);
+  }
+}