| // Copyright 2014 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. |
| |
| /** |
| * @fileoverview Implements a "generic" RequestHelper that provides a default |
| * response to unknown requests, and supports registering handlers for known |
| * requests. |
| */ |
| 'use strict'; |
| |
| /** |
| * @typedef {function(HelperRequest): RequestHandler} */ |
| var RequestHandlerFactory; |
| |
| /** |
| * Implements a "generic" RequestHelper that provides a default |
| * response to unknown requests, and supports registering handlers for known |
| * @constructor |
| * @implements {RequestHelper} |
| */ |
| function GenericRequestHelper() { |
| /** @private {Object.<string, RequestHandlerFactory>} */ |
| this.handlerFactories_ = {}; |
| } |
| |
| /** |
| * Gets a handler for a request. |
| * @param {HelperRequest} request The request to handle. |
| * @return {RequestHandler} A handler for the request. |
| */ |
| GenericRequestHelper.prototype.getHandler = function(request) { |
| if (this.handlerFactories_.hasOwnProperty(request.type)) { |
| return this.handlerFactories_[request.type](request); |
| } |
| return null; |
| }; |
| |
| /** |
| * Registers a handler factory for a given type. |
| * @param {string} type The request type. |
| * @param {RequestHandlerFactory} factory A factory that can produce a handler |
| * for a request of a given type. |
| */ |
| GenericRequestHelper.prototype.registerHandlerFactory = |
| function(type, factory) { |
| this.handlerFactories_[type] = factory; |
| }; |