protected function _isMemberOfIdps(EngineBlock_VirtualOrganization $virtualOrganization, $idp)
 {
     $idpIdentifiers = $virtualOrganization->getIdpIdentifiers();
     foreach ($idpIdentifiers as $idpId) {
         if ($idpId === $idp) {
             return true;
         }
     }
     return false;
 }