PluginLoader.js

/**
 * @license
 * Copyright (C) 2012 KO GmbH <copyright@kogmbh.com>
 *
 * @licstart
 * The JavaScript code in this page is free software: you can redistribute it
 * and/or modify it under the terms of the GNU Affero General Public License
 * (GNU AGPL) as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.  The code is distributed
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU AGPL for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this code.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As additional permission under GNU AGPL version 3 section 7, you
 * may distribute non-source (e.g., minimized or compacted) forms of
 * that code without the copy of the GNU GPL normally required by
 * section 4, provided you include this license notice and a URL
 * through which recipients can access the Corresponding Source.
 *
 * As a special exception to the AGPL, any HTML file which merely makes function
 * calls to this code, and for that purpose includes it by reference shall be
 * deemed a separate work for copyright law purposes. In addition, the copyright
 * holders of this code give you permission to combine this code with free
 * software libraries that are released under the GNU LGPL. You may copy and
 * distribute such a system following the terms of the GNU AGPL for this code
 * and the LGPL for the libraries. If you modify this code, you may extend this
 * exception to your version of the code, but you are not obligated to do so.
 * If you do not wish to do so, delete this exception statement from your
 * version.
 *
 * This license applies to this entire compilation.
 * @licend
 * @source: http://viewerjs.org/
 * @source: http://github.com/kogmbh/Viewer.js
 */

/*global document, window, Viewer, ODFViewerPlugin, PDFViewerPlugin*/

var viewer;

function loadPlugin(pluginName, callback) {
    "use strict";
    var script, style;

    // Load script
    script = document.createElement('script');
    script.async = false;
    script.onload = callback;
    script.src = pluginName + '.js';
    script.type = 'text/javascript';
    document.getElementsByTagName('head')[0].appendChild(script);
}

function loadDocument(documentUrl) {
    "use strict";

    if (documentUrl) {
        var extension = documentUrl.split('.').pop(),
            Plugin;
        extension = extension.toLowerCase();
        
        switch (extension) {
        case 'odt':
        case 'odp':
        case 'ods':
        case 'fodt':
            loadPlugin('./ODFViewerPlugin', function () {
                Plugin = ODFViewerPlugin;
            });
            break;
        case 'pdf':
            loadPlugin('./PDFViewerPlugin', function () {
                Plugin = PDFViewerPlugin;
            });
            break;
        }

        window.onload = function () {
            if (Plugin) {
                viewer = new Viewer(new Plugin());
            }
        };
    }
}