Locale switch for symfony2

LocaleListener.php

use Symfony\Component\DependencyInjection\ContainerInterface;

use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;

class LocaleListener
{
    private $container;
    private $defaultLocale;

    public function __construct(ContainerInterface $container, $defaultLocale = 'nl')
    {
        $this->container = $container;
        $this->defaultLocale = $defaultLocale;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        if (HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) {
            return;
        }

        if (!$this->container->has('session')) {
            return;
        }

        $session = $this->container->get('session');
        $session->setLocale($this->defaultLocale);
    }
}