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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 /** | 5 /** |
| 6 * @fileoverview Implements a "generic" RequestHelper that provides a default | 6 * @fileoverview Implements a "generic" RequestHelper that provides a default |
| 7 * response to unknown requests, and supports registering handlers for known | 7 * response to unknown requests, and supports registering handlers for known |
| 8 * requests. | 8 * requests. |
| 9 */ | 9 */ |
| 10 'use strict'; | 10 'use strict'; |
| 11 | 11 |
| 12 /** | 12 /** |
| 13 * @typedef {function(HelperRequest): RequestHandler} */ | 13 * @typedef {function(HelperRequest): RequestHandler} */ |
| 14 var RequestHandlerFactory; | 14 var RequestHandlerFactory; |
| 15 | 15 |
| 16 /** | 16 /** |
| 17 * Implements a "generic" RequestHelper that provides a default | 17 * Implements a "generic" RequestHelper that provides a default |
| 18 * response to unknown requests, and supports registering handlers for known | 18 * response to unknown requests, and supports registering handlers for known |
| 19 * @constructor | 19 * @constructor |
| 20 * @implements {RequestHelper} | 20 * @implements {RequestHelper} |
| 21 */ | 21 */ |
| 22 function GenericRequestHelper() { | 22 function GenericRequestHelper() { |
| 23 /** @private {Object.<string, RequestHandlerFactory>} */ | 23 /** @private {Object<string, RequestHandlerFactory>} */ |
| 24 this.handlerFactories_ = {}; | 24 this.handlerFactories_ = {}; |
| 25 } | 25 } |
| 26 | 26 |
| 27 /** | 27 /** |
| 28 * Gets a handler for a request. | 28 * Gets a handler for a request. |
| 29 * @param {HelperRequest} request The request to handle. | 29 * @param {HelperRequest} request The request to handle. |
| 30 * @return {RequestHandler} A handler for the request. | 30 * @return {RequestHandler} A handler for the request. |
| 31 */ | 31 */ |
| 32 GenericRequestHelper.prototype.getHandler = function(request) { | 32 GenericRequestHelper.prototype.getHandler = function(request) { |
| 33 if (this.handlerFactories_.hasOwnProperty(request.type)) { | 33 if (this.handlerFactories_.hasOwnProperty(request.type)) { |
| 34 return this.handlerFactories_[request.type](request); | 34 return this.handlerFactories_[request.type](request); |
| 35 } | 35 } |
| 36 return null; | 36 return null; |
| 37 }; | 37 }; |
| 38 | 38 |
| 39 /** | 39 /** |
| 40 * Registers a handler factory for a given type. | 40 * Registers a handler factory for a given type. |
| 41 * @param {string} type The request type. | 41 * @param {string} type The request type. |
| 42 * @param {RequestHandlerFactory} factory A factory that can produce a handler | 42 * @param {RequestHandlerFactory} factory A factory that can produce a handler |
| 43 * for a request of a given type. | 43 * for a request of a given type. |
| 44 */ | 44 */ |
| 45 GenericRequestHelper.prototype.registerHandlerFactory = | 45 GenericRequestHelper.prototype.registerHandlerFactory = |
| 46 function(type, factory) { | 46 function(type, factory) { |
| 47 this.handlerFactories_[type] = factory; | 47 this.handlerFactories_[type] = factory; |
| 48 }; | 48 }; |
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