<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Feed_Writer

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Feed.php 20325 2010-01-16 00:17:59Z padraic $

 */

/**

 * @see Zend_Feed_Writer_Extension_RendererAbstract

 */

require_once 'Zend/Feed/Writer/Extension/RendererAbstract.php';

/**

 * @category   Zend

 * @package    Zend_Feed_Writer

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Feed_Writer_Extension_Atom_Renderer_Feed

    extends Zend_Feed_Writer_Extension_RendererAbstract

{

    /**

     * Set to TRUE if a rendering method actually renders something. This

     * is used to prevent premature appending of a XML namespace declaration

     * until an element which requires it is actually appended.

     *

     * @var bool

     */

    protected $_called = false;

    /**

     * Render feed

     * 

     * @return void

     */

    public function render()

    {

        /**

         * RSS 2.0 only. Used mainly to include Atom links and

         * Pubsubhubbub Hub endpoint URIs under the Atom namespace

         */

        if (strtolower($this->getType()) == 'atom') {

            return;

        }

        $this->_setFeedLinks($this->_dom, $this->_base);

        $this->_setHubs($this->_dom, $this->_base);

        if ($this->_called) {

            $this->_appendNamespaces();

        }

    }

    /**

     * Append namespaces to root element of feed

     * 

     * @return void

     */

    protected function _appendNamespaces()

    {

        $this->getRootElement()->setAttribute('xmlns:atom',

            'http://www.w3.org/2005/Atom');  

    }

    /**

     * Set feed link elements

     * 

     * @param  DOMDocument $dom 

     * @param  DOMElement $root 

     * @return void

     */

    protected function _setFeedLinks(DOMDocument $dom, DOMElement $root)

    {

        $flinks = $this->getDataContainer()->getFeedLinks();

        if(!$flinks || empty($flinks)) {

            return;

        }

        foreach ($flinks as $type => $href) {

            $mime  = 'application/' . strtolower($type) . '+xml';

            $flink = $dom->createElement('atom:link');

            $root->appendChild($flink);

            $flink->setAttribute('rel', 'self');

            $flink->setAttribute('type', $mime);

            $flink->setAttribute('href', $href);

        }

        $this->_called = true;

    }

    /**

     * Set PuSH hubs

     * 

     * @param  DOMDocument $dom 

     * @param  DOMElement $root 

     * @return void

     */

    protected function _setHubs(DOMDocument $dom, DOMElement $root)

    {

        $hubs = $this->getDataContainer()->getHubs();

        if (!$hubs || empty($hubs)) {

            return;

        }

        foreach ($hubs as $hubUrl) {

            $hub = $dom->createElement('atom:link');

            $hub->setAttribute('rel', 'hub');

            $hub->setAttribute('href', $hubUrl);

            $root->appendChild($hub);

        }

        $this->_called = true;

    }

}