}

        if (encoding != null) {
            String enc;
            if (StringUtil.isNotBlank(getFessConfig().getCrawlerDocumentSiteEncoding())
                    && (!getFessConfig().isCrawlerDocumentUseSiteEncodingOnEnglish() || "ISO-8859-1".equalsIgnoreCase(encoding)
                            || "US-ASCII".equalsIgnoreCase(encoding))) {
                enc = getFessConfig().getCrawlerDocumentSiteEncoding();
            } else {

            }

            @Override
            public String getCrawlerDocumentSiteEncoding() {
                return "";
            }

            @Override
            public boolean isCrawlerDocumentUseSiteEncodingOnEnglish() {
                return false;
            }

            @Override
            public String getCrawlerDocumentUnknownHostname() {
                return "unknown";
            }

     * comment: Whether to use site encoding for English documents.
     * @return The determination, true or false. (if not found, exception but basically no way)
     */
    boolean isCrawlerDocumentUseSiteEncodingOnEnglish();

    /**
     * Get the value for the key 'crawler.document.append.data'. <br>
     * The value is, e.g. true <br>
     * comment: Whether to append data to documents.