assertTrue(extractorFactory.getExtractor(key) instanceof TikaExtractor);

        key = "application/vnd.ms-excel";
        assertTrue(extractorFactory.getExtractor(key) instanceof TikaExtractor);

        key = "application/vnd.ms-powerpoint";
        assertTrue(extractorFactory.getExtractor(key) instanceof TikaExtractor);

        key = "application/vnd.visio";
        assertTrue(extractorFactory.getExtractor(key) instanceof TikaExtractor);

            out.flush();

            Extractor extractor = StringUtil.isBlank(mimeType) ? null : extractorFactory.getExtractor(mimeType);
            if (extractor == null) {
                final String detectedMimeType = getMimeType(out);
                extractor = extractorFactory.getExtractor(detectedMimeType);
                if (extractor == null) {
                    if (logger.isDebugEnabled()) {

            throw new CrawlerSystemException("The key list is empty.");
        }
        for (final String key : keyList) {
            addExtractor(key, extractor);
        }
    }

    public Extractor getExtractor(final String key) {
        return extractorMap.get(key);
    }

    public void setExtractorMap(final Map<String, Extractor> extractorMap) {
        this.extractorMap = extractorMap;
    }

    protected Map<String, String> metaContentMapping;

    protected FessConfig fessConfig;

    protected abstract Extractor getExtractor(ResponseData responseData);

    @Override
    public ResultData transform(final ResponseData responseData) {
        if (responseData == null || !responseData.hasResponseBody()) {