public function createGatheringItems(GatheringDataSourceConfiguration $configuration)
 {
     $fp = Loader::helper('feed');
     $feed = $fp->load(self::FLICKR_FEED_URL . '?tags=' . $configuration->getFlickrFeedTags(), false);
     $feed->init();
     $feed->handle_content_type();
     $posts = $feed->get_items(0);
     $gathering = $configuration->getGatheringObject();
     $lastupdated = 0;
     if ($gathering->getGatheringDateLastUpdated()) {
         $lastupdated = strtotime($gathering->getGatheringDateLastUpdated());
     }
     $items = array();
     foreach ($posts as $p) {
         $item = FlickrFeedGatheringItem::add($configuration, $p);
         if (is_object($item)) {
             $items[] = $item;
         }
     }
     return $items;
 }