Role and class based ACLs with Symfony 2

WhatEver.php

<?php
$this->get('security.context')->isGranted('ROLE_ADMIN');

WhatEver2.php

<?php
$securityIdentity = new RoleSecurityIdentity('ROLE_ADMIN');
$objectIdentity = new ObjectIdentity('newsClass', 'Acme\\DemoBundle\\Entity\\News');
$acl = $aclProvider->createAcl($objectIdentity);

$acl->insertClassAce($securityIdentity, MaskBuilder::MASK_OWNER);
$aclProvider->updateAcl($acl);

WhatEver3.php

<?php
$this->objectIdentity = new ObjectIdentity(self::OBJECT_ID, self::OBJECT_FQCN);
if ($this->securityContext->isGranted('OWNER', $this->objectIdentity) === false) {
    throw new AccessDeniedException('You don’t have the required permissions!');
}