/**
  * @param ItemList $list
  */
 public function filterList(ItemList $list)
 {
     if (isset($this->data['versionToRetrieve']) && $this->data['versionToRetrieve']) {
         $versionToRetrieve = $this->data['versionToRetrieve'];
     } else {
         $versionToRetrieve = PageList::PAGE_VERSION_ACTIVE;
     }
     $list->setPageVersionToRetrieve($versionToRetrieve);
 }