public function addRoute($request, $destinationController) {
        $explodedDestination = explode('/', $destinationController);
        if (file_exists(CONTROLLERS . DS . ucfirst($explodedDestination[0]) . '_Controller.php')) {
            $this->_routes[$request] = $destinationController;
        } else {
            throw new RoutingException('Non existant MVC route specified: ' . $destinationController);
        }
    }