public function getNodeUids(array $contentUids)
    {
        if (empty($contentUids)) {
            return [];
        }

        $meta = $this
                ->getEntityManager()
                ->getClassMetadata('BackBee\ClassContent\AbstractClassContent');

        $nodeUids = $this
                ->getEntityManager()
                ->getConnection()
                ->createQueryBuilder()
                ->select('c.node_uid')
                ->from($meta->getTableName(), 'c')
                ->andWhere('c.' . $meta->getColumnName('_uid') . ' IN (:ids)')
                ->setParameter('ids', $contentUids, Connection::PARAM_STR_ARRAY)
                ->execute()
                ->fetchAll(\PDO::FETCH_COLUMN);

        return array_unique(array_filter($nodeUids));
    }