} catch (final Exception e) {
            throw new ExtractException(e);
        }
    }

    protected ExtractData createExtractData(final String content) {
        return new ExtractData(extractString(content));
    }

    protected String getEncoding(final BufferedInputStream bis) {
        final byte[] b = new byte[preloadSizeForCharset];
        try {
            bis.mark(preloadSizeForCharset);

            parser.parse(new InputSource(reader));
        } catch (final Exception e) {
            logger.warn("Failed to parse the content.", e);
            return new ExtractData(extractString(content));
        }

        final Document document = parser.getDocument();
        try {
            final ExtractData extractData = new ExtractData(