protected static function _validateRouteClass($routeClass)
{
if ($routeClass !== 'CakeRoute' && (!class_exists($routeClass) || !is_subclass_of($routeClass, 'CakeRoute'))) {
throw new RouterException(__d('cake_dev', 'Route class not found, or route class is not a subclass of CakeRoute'));
}
return $routeClass;
}