chrome/browser/resources/cryptotoken/generichelper.js

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