text: <?php
  /**
   * Zend Framework (http://framework.zend.com/)
   *
   * @link      http://github.com/zendframework/zf2 for the canonical source repository
   * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
   * @license   http://framework.zend.com/license/new-bsd New BSD License
   */
  
  namespace Zend\Feed\Reader\Extension\CreativeCommons;
  
  use Zend\Feed\Reader\Extension;
  
  class Feed extends Extension\AbstractFeed
  {
      /**
       * Get the entry license
       *
       * @param int $index
       * @return string|null
       */
      public function getLicense($index = 0)
      {
          $licenses = $this->getLicenses();
  
          if (isset($licenses[$index])) {
              return $licenses[$index];
          }
  
          return null;
      }
  
      /**
       * Get the entry licenses
       *
       * @return array
       */
      public function getLicenses()
      {
          $name = 'licenses';
          if (array_key_exists($name, $this->data)) {
              return $this->data[$name];
          }
  
          $licenses = array();
          $list = $this->xpath->evaluate('channel/cc:license');
  
          if ($list->length) {
              foreach ($list as $license) {
                  $licenses[] = $license->nodeValue;
              }
  
              $licenses = array_unique($licenses);
          }
  
          $this->data[$name] = $licenses;
  
          return $this->data[$name];
      }
  
      /**
       * Register Creative Commons namespaces
       *
       * @return void
       */
      protected function registerNamespaces()
      {
          $this->xpath->registerNamespace('cc', 'http://backend.userland.com/creativeCommonsRssModule');
      }
  }
  