if (dataClass == null) {
            // check transformer name
            if (!getName().equals(accessResultData.getTransformerName())) {
                throw new CrawlerSystemException("Transformer is invalid. Use " + accessResultData.getTransformerName()
                        + ". This transformer is " + getName() + ".");
            }

            final byte[] data = accessResultData.getData();

                try {
                    final Transformer transformer = ComponentUtil.getComponent(accessResultData.getTransformerName());
                    if (transformer == null) {
                        // no transformer
                        logger.warn("No transformer: {}", accessResultData.getTransformerName());
                        continue;
                    }
                    @SuppressWarnings("unchecked")

    public Object getData(final AccessResultData<?> accessResultData) {
        // check transformer name
        if (!getName().equals(accessResultData.getTransformerName())) {
            throw new CrawlerSystemException(
                    "Transformer is invalid. Use " + accessResultData.getTransformerName() + ". This transformer is " + getName() + ".");
        }

        final byte[] data = accessResultData.getData();
        if (data == null) {