* @return the access result data, or null if retrieval fails
     */
    private AccessResultData<?> getAccessResultData(final OpenSearchAccessResult accessResult) {
        try {
            return accessResult.getAccessResultData();
        } catch (final Exception e) {
            logger.warn("Failed to get data: url={}", accessResult.getUrl(), e);
        }
        return null;

        }

        @Override
        public void setLastModified(Long lastModified) {
            // Do nothing in test
        }

        @Override
        public AccessResultData<String> getAccessResultData() {
            return null;
        }

        @Override
        public void setContentLength(Long contentLength) {
            // Do nothing in test
        }

        @Override

        final AccessResult<?> accessResult = ComponentUtil.getDataService().getAccessResult(sessionId, parentUrl);
        if (accessResult != null) {
            final AccessResultData<?> accessResultData = accessResult.getAccessResultData();
            if (accessResultData != null && accessResultData.getEncoding() != null) {
                enc = accessResultData.getEncoding();
                parentEncodingMap.put(key, enc);
                return enc;