}

        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";
            }