private function mapRoute2IndexKey($route)
    {
        $route = rtrim($route, "/");

        if (key_exists($route, $this->index)) {
            return $route;
        } elseif (empty($route) && key_exists("index", $this->index)) {
            return "index";
        } elseif (key_exists($route . "/index", $this->index)) {
            return "$route/index";
        }

        return false;
    }