* caching, pagination, and user interface functionality.
 *
 */
public class ViewHelper {

    /**
     * Default constructor for ViewHelper.
     */
    public ViewHelper() {
        // Default constructor
    }

    private static final Logger logger = LogManager.getLogger(ViewHelper.class);

    /** Request attribute key for screen width */

            docMap.put(Constants.TEXT_FRAGMENTS, viewHelper.createTextFragmentsByQuery());
        }

        // ContentTitle
        if (viewHelper != null) {
            docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
            docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));

        }
        if (!fessConfig.isSearchFileProxyEnabled()) {
            return HtmlResponse.fromRedirectPathAsIs(targetUrl + hash);
        }
        final ViewHelper viewHelper = ComponentUtil.getViewHelper();
        try {
            final StreamResponse response = viewHelper.asContentResponse(doc);
            if (response.getHttpStatus().orElse(200) == 404) {
                logger.debug("Not found: {}", targetUrl);

     *
     * @return list of FacetQueryView objects
     */
    public static List<FacetQueryView> facetQueryViewList() {
        final ViewHelper viewHelper = ComponentUtil.getViewHelper();
        return viewHelper.getFacetQueryViewList();
    }

    /**
     * Creates a URL query string from request parameters that start with the specified prefix.
     *

                    }

                    final ViewHelper viewHelper = ComponentUtil.getViewHelper();
                    if (viewHelper != null && !docMap.isEmpty()) {
                        docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
                        docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));

     * by calling buildInitParamMap for both parameter types.
     */
    protected void buildInitParams() {
        buildInitParamMap(viewHelper.getInitFacetParamMap(), Constants.FACET_QUERY, Constants.FACET_FORM);
        buildInitParamMap(viewHelper.getInitGeoParamMap(), Constants.GEO_QUERY, Constants.GEO_FORM);
    }

    /**
     * Builds parameter maps for search initialization, creating both query strings

        }
        if (doc == null) {
            saveError(messages -> messages.addErrorsDocidNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);
        }

        final String content = viewHelper.createCacheContent(doc, form.hq);
        if (content == null) {
            saveError(messages -> messages.addErrorsDocidNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);
        }

    }

    /**
     * The search page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    public HtmlResponse search(final SearchForm form) {
        if (viewHelper.isUseSession()) {
            LaRequestUtil.getOptionalRequest().ifPresent(request -> {
                final HttpSession session = request.getSession(false);
                if (session != null && form.num != null) {