* and handles special cases like "all languages" selection.
     *
     * @param request The HTTP servlet request
     * @param params The search request parameters
     * @return Array of normalized language codes
     */
    public String[] getLanguages(final HttpServletRequest request, final SearchRequestParams params) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

    protected LoadingCache<String, List<Map<String, String>>> langItemsCache;

    /** The encoding for filtering paths. */
    protected String filterPathEncoding;

    /** An array of supported language codes. */
    protected String[] supportedLanguages;

    /** A list of shutdown hooks to be executed on system shutdown. */
    protected List<Runnable> shutdownHookList = new ArrayList<>();