--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Security/Acl/Domain/ObjectIdentityRetrievalStrategy.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Security\Acl\Domain;
+
+use Symfony\Component\Security\Acl\Exception\InvalidDomainObjectException;
+use Symfony\Component\Security\Acl\Model\ObjectIdentityRetrievalStrategyInterface;
+
+/**
+ * Strategy to be used for retrieving object identities from domain objects
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class ObjectIdentityRetrievalStrategy implements ObjectIdentityRetrievalStrategyInterface
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function getObjectIdentity($domainObject)
+    {
+        try {
+            return ObjectIdentity::fromDomainObject($domainObject);
+        } catch (InvalidDomainObjectException $failed) {
+            return null;
+        }
+    }
+}