public function getRootNode($host = null)
    {
        if (!$this->isMultiDomainHost()) {
            return parent::getRootNode();
        }

        if (is_null($this->rootNode)) {
            $host = $this->getRealHost($host);

            $internalName = $this->hosts[$host]['root'];
            $nodeRepo = $this->em->getRepository('KunstmaanNodeBundle:Node');
            $this->rootNode = $nodeRepo->getNodeByInternalName($internalName);
        }

        return $this->rootNode;
    }