* Handles file, SMB, FTP, and HTTP protocols.
     *
     * @param document the document data map
     * @return the processed URL link
     */
    public String getUrlLink(final Map<String, Object> document) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        String url = DocumentUtil.getValue(document, fessConfig.getIndexFieldUrl(), String.class);

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (doc.get(fessConfig.getResponseFieldUrlLink()) == null) {
            doc.put(fessConfig.getResponseFieldUrlLink(), ComponentUtil.getViewHelper().getUrlLink(doc));
        }
    }

    /**
     * Result of a search operation, including queryId and requestedTime.
     */
    protected static class ChatSearchResult {