}
        return systemHelper;
    }

    /**
     * Gets the view helper component.
     * @return The view helper.
     */
    public static ViewHelper getViewHelper() {
        return getComponent(VIEW_HELPER);
    }

    /**
     * Gets the Samba helper component.
     * @return The Samba helper.
     */
    public static SambaHelper getSambaHelper() {

            // Facet query views for filter UI (file type, timestamp, size)
            RenderDataUtil.register(data, "facetQueryViewList", ComponentUtil.getViewHelper().getFacetQueryViewList());
        });
    }

    /**
     * Clears the chat session.
     *
     * @param form the chat form containing the session ID to clear

    }

    /**
     * Get the client IP.
     * @return The client IP.
     */
    protected String getClientIp() {
        return LaRequestUtil.getOptionalRequest().map(req -> ComponentUtil.getViewHelper().getClientIp(req)).orElse("-");
    }

    /**
     * The action.
     */
    protected enum Action {
        /**
         * The login action.
         */
        LOGIN,
        /**

            return new String[0];
        }
        // Build allowlist from configured facet queries
        final List<FacetQueryView> facetQueryViewList = ComponentUtil.getViewHelper().getFacetQueryViewList();
        final Set<String> allowedQueries = new java.util.HashSet<>();
        for (final FacetQueryView view : facetQueryViewList) {
            allowedQueries.addAll(view.getQueryMap().values());

        final HttpServletRequest request = LaRequestUtil.getOptionalRequest().orElse(null);
        final String clientIp = request != null ? ComponentUtil.getViewHelper().getClientIp(request) : null;
        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();

        public String getSimilarDocHash() {
            return request.getParameter("sdh");
        }

        @Override
        public HighlightInfo getHighlightInfo() {
            return ComponentUtil.getViewHelper().createHighlightInfo();
        }
    }

    /**
     * The request parameters for suggest API.
     */
    protected static class RequestParameter extends SearchRequestParams {

        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 {