@l5i/dashjs/build/es5/src/core/FactoryMaker.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

/**
 * The copyright in this software is being made available under the BSD License,
 * included below. This software may be subject to other third party and contributor
 * rights, including patent rights, and no such rights are granted under this license.
 *
 * Copyright (c) 2013, Dash Industry Forum.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *  * Neither the name of Dash Industry Forum nor the names of its
 *  contributors may be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
 *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */ /**
 * @module FactoryMaker
 */"use strict";Object.defineProperty(exports,"__esModule",{value:true});var FactoryMaker=(function(){var instance=undefined;var singletonContexts=[];var singletonFactories={};var classFactories={};function extend(name,childInstance,override,context){if(!context[name] && childInstance){context[name] = {instance:childInstance,override:override};}} /**
     * Use this method from your extended object.  this.factory is injected into your object.
     * this.factory.getSingletonInstance(this.context, 'VideoModel')
     * will return the video model for use in the extended object.
     *
     * @param {Object} context - injected into extended object as this.context
     * @param {string} className - string name found in all dash.js objects
     * with name __dashjs_factory_name Will be at the bottom. Will be the same as the object's name.
     * @returns {*} Context aware instance of specified singleton name.
     * @memberof module:FactoryMaker
     * @instance
     */function getSingletonInstance(context,className){for(var i in singletonContexts) {var obj=singletonContexts[i];if(obj.context === context && obj.name === className){return obj.instance;}}return null;} /**
     * Use this method to add an singleton instance to the system.  Useful for unit testing to mock objects etc.
     *
     * @param {Object} context
     * @param {string} className
     * @param {Object} instance
     * @memberof module:FactoryMaker
     * @instance
     */function setSingletonInstance(context,className,instance){for(var i in singletonContexts) {var obj=singletonContexts[i];if(obj.context === context && obj.name === className){singletonContexts[i].instance = instance;return;}}singletonContexts.push({name:className,context:context,instance:instance});} /*------------------------------------------------------------------------------------------*/ // Factories storage Management
/*------------------------------------------------------------------------------------------*/function getFactoryByName(name,factoriesArray){return factoriesArray[name];}function updateFactory(name,factory,factoriesArray){if(name in factoriesArray){factoriesArray[name] = factory;}} /*------------------------------------------------------------------------------------------*/ // Class Factories Management
/*------------------------------------------------------------------------------------------*/function updateClassFactory(name,factory){updateFactory(name,factory,classFactories);}function getClassFactoryByName(name){return getFactoryByName(name,classFactories);}function getClassFactory(classConstructor){var factory=getFactoryByName(classConstructor.__dashjs_factory_name,classFactories);if(!factory){factory = function(context){if(context === undefined){context = {};}return {create:function create(){return merge(classConstructor,context,arguments);}};};classFactories[classConstructor.__dashjs_factory_name] = factory; // store factory
}return factory;} /*------------------------------------------------------------------------------------------*/ // Singleton Factory MAangement
/*------------------------------------------------------------------------------------------*/function updateSingletonFactory(name,factory){updateFactory(name,factory,singletonFactories);}function getSingletonFactoryByName(name){return getFactoryByName(name,singletonFactories);}function getSingletonFactory(classConstructor){var factory=getFactoryByName(classConstructor.__dashjs_factory_name,singletonFactories);if(!factory){factory = function(context){var instance=undefined;if(context === undefined){context = {};}return {getInstance:function getInstance(){ // If we don't have an instance yet check for one on the context
if(!instance){instance = getSingletonInstance(context,classConstructor.__dashjs_factory_name);} // If there's no instance on the context then create one
if(!instance){instance = merge(classConstructor,context,arguments);singletonContexts.push({name:classConstructor.__dashjs_factory_name,context:context,instance:instance});}return instance;}};};singletonFactories[classConstructor.__dashjs_factory_name] = factory; // store factory
}return factory;}function merge(classConstructor,context,args){var classInstance=undefined;var className=classConstructor.__dashjs_factory_name;var extensionObject=context[className];if(extensionObject){var extension=extensionObject.instance;if(extensionObject.override){ //Override public methods in parent but keep parent.
classInstance = classConstructor.apply({context:context},args);extension = extension.apply({context:context,factory:instance,parent:classInstance},args);for(var prop in extension) {if(classInstance.hasOwnProperty(prop)){classInstance[prop] = extension[prop];}}}else { //replace parent object completely with new object. Same as dijon.
return extension.apply({context:context,factory:instance},args);}}else { // Create new instance of the class
classInstance = classConstructor.apply({context:context},args);} // Add getClassName function to class instance prototype (used by Debug)
classInstance.getClassName = function(){return className;};return classInstance;}instance = {extend:extend,getSingletonInstance:getSingletonInstance,setSingletonInstance:setSingletonInstance,getSingletonFactory:getSingletonFactory,getSingletonFactoryByName:getSingletonFactoryByName,updateSingletonFactory:updateSingletonFactory,getClassFactory:getClassFactory,getClassFactoryByName:getClassFactoryByName,updateClassFactory:updateClassFactory};return instance;})();exports["default"] = FactoryMaker;module.exports = exports["default"];
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