/**
* Fetches an instance of the router library, initializing if necessary.
*
* @param string $controllerPath Path where controllers are located.
* @return RPG_Router
*/
public static function router($controllerPath = '')
{
if (self::$_router === null) {
if (empty($controllerPath)) {
throw new RPG_Exception('Controller path cannot be empty on first call to RPG::router()');
}
self::$_router = RPG_Router::getInstance();
self::$_router->setControllerPath($controllerPath);
}
return self::$_router;
}
