Source for file browse_xml.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: browse_xml.act.php,v 1.4 2007/09/19 14:04:54 adamfranco Exp $
 */ 
 
require_once(POLYPHONY."/main/library/AbstractActions/Action.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: browse_xml.act.php,v 1.4 2007/09/19 14:04:54 adamfranco Exp $
 */
class browse_xmlAction 
    extends Action
{
    /**
     * Check Authorizations
     * 
     * @return boolean 
     * @access public
     * @since 4/26/05
     */
    function isAuthorizedToExecute () {
        return true;
    }
    
    /**
     * Return the heading text for this action, or an empty string.
     * 
     * @return string 
     * @access public
     * @since 4/26/05
     */
    function getHeadingText () {
        return _("Viewing Selection");
    }
    
    /**
     * Answer the title of this slideshow
     * 
     * @return string 
     * @access public
     * @since 5/4/06
     */
    function getTitle () {
        return _("Viewing Selection");
    }
    
    /**
     * Answer the assets to display in the slideshow
     * 
     * @return object AssetIterator 
     * @access public
     * @since 5/4/06
     */
    function getAssets () {
        $assets = array();
        $repositoryManager = Services::getService("Repository");
        
        $basket = Basket::instance();
        $basket->clean();
        $basket->reset();
        
        while ($basket->hasNext())
            $assets[] =$repositoryManager->getAsset($basket->next());
        
        $iterator = new HarmoniIterator($assets);
        return $iterator;
    }
    
    /**
     * Build the content for this action
     * 
     * @return boolean 
     * @access public
     * @since 4/26/05
     */
    function execute () {                        
        /*********************************************************
         * First print the header, then the xml content, then exit before
         * the GUI system has a chance to try to theme the output.
         *********************************************************/        
        header("Content-Type: text/xml; charset=\"utf-8\"");
        
        print<<<END
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE slideshow PUBLIC "- //Middlebury College//Slide-Show//EN" "http://concerto.sourceforge.net/dtds/viewer/2.0/slideshow.dtd">
<slideshow>
 
END;
        print "\t<title>".$this->getTitle()."</title>\n";
        
        print "\t<media-sizes>\n";
        print "\t\t\t\t<size>small</size>\n";
        print "\t\t\t\t<size>medium</size>\n";
        print "\t\t\t\t<size>large</size>\n";
        print "\t\t\t\t<size>original</size>\n";
        print "\t</media-sizes>\n";
        
        print "\t<default_size>medium</default_size>\n";
    
        
        $assets =$this->getAssets();
        
        
        $authZ = Services::getService("AuthZ");
        $idManager = Services::getService("Id");
        
        while ($assets->hasNext())
            $this->printAssetXML($assets->next());
        
        print "</slideshow>\n";        
        exit;
    }    
    
    /**
     * Function for printing the asset block of the slideshow XML file
     * 
     * @param object Asset $asset 
     * @return void 
     * @access public
     * @since 10/14/05
     */
    function printAssetXML( $asset) {
        
        $assetId =$asset->getId();
        $harmoni = Harmoni::instance();
        
        
        // ------------------------------------------
        
        print "\t<slide ";
        print "source='";
        print $harmoni->request->quickURL('collection', 'browse_slide_xml', 
            array('asset_id' => $assetId->getIdString()));
        print "'>\n";
        
        // Text-Position
        print "\t\t<text-position>";
            print "right";
        print "</text-position>\n";        
        
        print "\t</slide>\n";
    }
}