private function setDriver($driver = null, $config = null)
{
$driver = $driver ?: $this->config['driver'];
$config = $config ?: $this->config['driverConfig'];
$class = strpos($driver, '\\') ? $driver : '\\org\\upload\\driver\\' . ucfirst(strtolower($driver));
$this->uploader = new $class($config);
}