Source for file addAjax.act.php

<?php
/**
 * @package polyphony.basket
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: addAjax.act.php,v 1.4 2007/09/19 14:04:54 adamfranco Exp $
 */ 
 
require_once(POLYPHONY."/main/library/AbstractActions/MainWindowAction.class.php");
require_once(POLYPHONY."/main/library/Basket/Basket.class.php");
 
/**
 * 
 * 
 * @package polyphony.basket
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: addAjax.act.php,v 1.4 2007/09/19 14:04:54 adamfranco Exp $
 */
class addAjaxAction 
    extends Action
{
    /**
     * Check Authorizations
     * 
     * @return boolean 
     * @access public
     * @since 4/26/05
     */
    function isAuthorizedToExecute () {
        // Check that the user can access this collection
        return TRUE;
    }
    
    /**
     * Return the heading text for this action, or an empty string.
     * 
     * @return string 
     * @access public
     * @since 4/26/05
     */
    function getHeadingText () {
        return _("Add an Item to Your Selection");
    }
    
    /**
     * Build the content for this action
     * 
     * @return boolean 
     * @access public
     * @since 4/26/05
     */
    function execute () {
        $harmoni = Harmoni::instance();
        $harmoni->request->startNamespace("basket");
        
        $idManager = Services::getService("Id");
        $authZ = Services::getService("AuthZ");
        
        $basket = Basket::instance();
        $viewAZ =$idManager->getId("edu.middlebury.authorization.view");
        $assetIdList = RequestContext::value("assets");
        $assetIdArray = explode(",", trim($assetIdList));
        foreach ($assetIdArray as $id) {
            $assetId =$idManager->getId($id);
            if ($authZ->isUserAuthorized(
                $viewAZ, 
                $assetId)) 
            {
                $basket->addItem($assetId);
            }
        }
        $harmoni->request->endNamespace();
        
        print $basket->getSmallBasketHtml();
        exit;
    }
}