// ignore
        }
        return false;
    }

    /**
     * For test purpose only.
     *
     * @param fessConfig fessConfig instance
     */
    public static void setFessConfig(final FessConfig fessConfig) {
        ComponentUtil.fessConfig = fessConfig;
        if (fessConfig == null) {
            systemHelper = null;
            FessProp.propMap.clear();
            componentMap.clear();