| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| <link rel="import" href="/base/base.html"> |
| <link rel="import" href="/importer/importer.html"> |
| |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview Base class for trace data importers. |
| */ |
| tr.exportTo('tr.importer', function() { |
| var Importer = tr.importer.Importer; |
| /** |
| * Importer for empty strings and arrays. |
| * @constructor |
| */ |
| function EmptyImporter(events) { |
| this.importPriority = 0; |
| }; |
| |
| EmptyImporter.canImport = function(eventData) { |
| if (eventData instanceof Array && eventData.length == 0) |
| return true; |
| if (typeof(eventData) === 'string' || eventData instanceof String) { |
| return eventData.length == 0; |
| } |
| return false; |
| }; |
| |
| EmptyImporter.prototype = { |
| __proto__: Importer.prototype |
| }; |
| |
| Importer.register(EmptyImporter); |
| |
| return { |
| EmptyImporter: EmptyImporter |
| }; |
| }); |
| </script> |
