throw new CrawlerSystemException("command is empty.");
        }

        final Map<String, String> params = new HashMap<>();
        params.put("$INPUT_FILE", inputFile.getAbsolutePath());
        params.put("$OUTPUT_FILE", outputFile.getAbsolutePath());

        final List<String> cmdList = parseCommand(command, params);
        if (logger.isInfoEnabled()) {
            logger.info("Command: {}", cmdList);
        }

            try {
                final String resourceName = params == null ? null : params.get(ExtractData.RESOURCE_NAME_KEY);
                final String contentType = params == null ? null : params.get(ExtractData.CONTENT_TYPE);
                String contentEncoding = params == null ? null : params.get(ExtractData.CONTENT_ENCODING);

     * java.util.Map)
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        if (in == null) {
            throw new CrawlerSystemException("in is null.");
        }

        final String resourceName = params == null ? null : params.get(ExtractData.RESOURCE_NAME_KEY);

        String extension;
        String filePrefix;

            }
        }
    }

    /**
     * Extracts text from an embedded file using the appropriate extractor.
     * @param filename the filename of the embedded file
     * @param embeddedFile the embedded file to extract text from
     * @param writer the writer to append extracted text to
     */

    /**
     * Constructs a new ExtractorBuilder.
     *
     * @param crawlerContainer the crawler container
     * @param in the input stream to extract data from
     * @param params the parameters for the extraction process
     */
    protected ExtractorBuilder(final CrawlerContainer crawlerContainer, final InputStream in, final Map<String, String> params) {
        this.crawlerContainer = crawlerContainer;
        this.in = in;

        }
    }

    /**
     * Parses request parameters from a string.
     * @param params The parameter string.
     * @param paramList Additional parameters.
     * @param encoding The encoding.
     * @return The HttpEntity containing the parsed parameters.
     */
    protected HttpEntity parseRequestParameters(final String params, final List<Pair<String, String>> paramList, final String encoding) {
        try {

     */
    @Override
    protected Pattern getTagPattern() {
        // not used
        return null;
    }

    /**
     * Adds a feature to the extractor.
     *
     * @param key   the key of the feature
     * @param value the value of the feature
     */
    public void addFeature(final String key, final String value) {
        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {

            Map<String, Object> params = new HashMap<String, Object>();
            FtpAuthentication auth = new FtpAuthentication();
            auth.setUsername(username);
            auth.setPassword(password);
            params.put(FtpClient.FTP_AUTHENTICATIONS_PROPERTY, new FtpAuthentication[] { auth });
            ftpClient.setInitParameterMap(params);

        final InputStream in = ResourceUtil.getResourceAsStream("extractor/program/test.java");
        final Map<String, String> params = new HashMap<String, String>();
        params.put("Content-Type", "text/plain");
        params.put("resourceName", "test.java");
        final ExtractData extractData = tikaExtractor.getText(in, params);
        final String content = extractData.getContent();
        CloseableUtil.closeQuietly(in);

     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        final Properties props = new Properties(mailProperties);
        if (params != null) {
            for (final Map.Entry<String, String> entry : params.entrySet()) {
                props.put(entry.getKey(), entry.getValue());
            }
        }
        try {