public function getRenditionDocument(OperationContextInterface $context = null)
    {
        $renditionDocumentId = $this->getRenditionDocumentId();
        if (empty($renditionDocumentId)) {
            return null;
        }

        if ($context === null) {
            $context = $this->session->getDefaultContext();
        }

        $document = $this->session->getObject($this->session->createObjectId($renditionDocumentId), $context);

        return $document instanceof DocumentInterface ? $document : null;
    }