public function getHydrator()
 {
     $hydrator = parent::getHydrator();
     $hydrator->addFilter('getIterator', new Filter\MethodMatchFilter('getIterator'), Filter\FilterComposite::CONDITION_AND);
     $hydrator->addFilter('getResources', new Filter\MethodMatchFilter('getResources'), Filter\FilterComposite::CONDITION_AND);
     return $hydrator;
 }