Наследование: extends eZ\Publish\Core\FieldType\Url\UrlStorage\Gateway
 /**
  * Returns a ready to test LegacyStorage gateway
  *
  * @return \eZ\Publish\Core\FieldType\Url\UrlStorage\Gateway\LegacyStorage
  */
 protected function getStorageGateway()
 {
     if (!isset($this->storageGateway)) {
         $this->storageGateway = new LegacyStorage();
         $this->storageGateway->setConnection($this->getDatabaseHandler());
     }
     return $this->storageGateway;
 }