All files / dash.js/src/streaming XlinkLoader.js

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/**
 * 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.
 */
import DashJSError from './vo/DashJSError.js';
import URLLoader from './net/URLLoader.js';
import {HTTPRequest} from './vo/metrics/HTTPRequest.js';
import TextRequest from './vo/TextRequest.js';
import EventBus from '../core/EventBus.js';
import Events from '../core/events/Events.js';
import FactoryMaker from '../core/FactoryMaker.js';
import Errors from '../core/errors/Errors.js';
 
function XlinkLoader(config) {
 
    config = config || {};
    const RESOLVE_TO_ZERO = 'urn:mpeg:dash:resolve-to-zero:2013';
 
    const context = this.context;
    const eventBus = EventBus(context).getInstance();
 
    let urlLoader = URLLoader(context).create({
        errHandler: config.errHandler,
        dashMetrics: config.dashMetrics,
        mediaPlayerModel: config.mediaPlayerModel,
        errors: Errors
    });
 
    let instance;
 
    function load(url, element, resolveObject) {
        const report = function (content, resolveToZero) {
            element.resolved = true;
            element.resolvedContent = content ? content : null;
 
            eventBus.trigger(Events.XLINK_ELEMENT_LOADED, {
                element: element,
                resolveObject: resolveObject,
                error: content || resolveToZero ?
                    null :
                    new DashJSError(
                        Errors.XLINK_LOADER_LOADING_FAILURE_ERROR_CODE,
                        Errors.XLINK_LOADER_LOADING_FAILURE_ERROR_MESSAGE + url
                    )
            });
        };
 
        if (url === RESOLVE_TO_ZERO) {
            report(null, true);
        } else {
            const request = new TextRequest(url, HTTPRequest.XLINK_EXPANSION_TYPE);
 
            urlLoader.load({
                request: request,
                success: function (data) {
                    report(data);
                },
                error: function () {
                    report(null);
                }
            });
        }
    }
 
    function reset() {
        if (urlLoader) {
            urlLoader.abort();
            urlLoader = null;
        }
    }
 
    instance = {
        load: load,
        reset: reset
    };
 
    return instance;
}
 
XlinkLoader.__dashjs_factory_name = 'XlinkLoader';
export default FactoryMaker.getClassFactory(XlinkLoader);