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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Feed_Writer_Extension_RendererAbstract
  */
 // require_once 'Zend/Feed/Writer/Extension/RendererAbstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Feed_Writer
  * @copyright  Copyright (c) 2005-2015 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;
     }
 }