protected function getDomainMapper() { if ($this->domainMapper !== null) { return $this->domainMapper; } $this->domainMapper = new Helper\DomainMapper($this->persistenceHandler->contentHandler(), $this->persistenceHandler->locationHandler(), $this->persistenceHandler->contentTypeHandler(), $this->persistenceHandler->contentLanguageHandler(), $this->getFieldTypeRegistry()); return $this->domainMapper; }