diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Form/CallbackTransformer.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Form/CallbackTransformer.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,70 @@
+<?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\Form;
+
+class CallbackTransformer implements DataTransformerInterface
+{
+    /**
+     * The callback used for forward transform
+     * @var \Closure
+     */
+    private $transform;
+
+    /**
+     * The callback used for reverse transform
+     * @var \Closure
+     */
+    private $reverseTransform;
+
+    /**
+     * Constructor.
+     *
+     * @param \Closure $transform           The forward transform callback
+     * @param \Closure $reverseTransform    The reverse transform callback
+     */
+    public function __construct(\Closure $transform, \Closure $reverseTransform)
+    {
+        $this->transform = $transform;
+        $this->reverseTransform = $reverseTransform;
+    }
+
+    /**
+     * Transforms a value from the original representation to a transformed representation.
+     *
+     * @param  mixed $data               The value in the original representation
+     *
+     * @return mixed                     The value in the transformed representation
+     *
+     * @throws UnexpectedTypeException   when the argument is not a string
+     * @throws TransformationFailedException  when the transformation fails
+     */
+    public function transform($data)
+    {
+        return call_user_func($this->transform, $data);
+    }
+
+    /**
+     * Transforms a value from the transformed representation to its original
+     * representation.
+     *
+     * @param  mixed $data               The value in the transformed representation
+     *
+     * @return mixed                     The value in the original representation
+     *
+     * @throws UnexpectedTypeException   when the argument is not of the expected type
+     * @throws TransformationFailedException  when the transformation fails
+     */
+    public function reverseTransform($data)
+    {
+        return call_user_func($this->reverseTransform, $data);
+    }
+}