Utilisation de Voter dans Symfony2

OwnerVoter

<?php

namespace Acme\Bundle\Security\Authorization\Voter;

use Acme\Bundle\Entity\Foobar;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;

class OwnerVoter implements VoterInterface
{
    public function supportsAttribute($attribute)
    {
        return 'OWNER' === $attribute;
    }

    public function supportsClass($class)
    {
        return $class instanceof Foobar;
    }

    function vote(TokenInterface $token, $object, array $attributes)
    {
        foreach ($attributes as $attribute) {
            if ($this->supportsAttribute($attribute) && $this->supportsClass($object)) {
                $user = $token->getUser();
                
                // Tournament Owner
                if ($object instanceof Foobar && $user->equals($object->getUser())) {
                    return VoterInterface::ACCESS_GRANTED;
                }
            }
        }
        
        return VoterInterface::ACCESS_DENIED;
    }
}