[Validator] Added dynamic constraints

src/Symfony/Component/Validator/ConstraintProviderInterface.php

@@ -0,0 +1,27 @@
+<?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\Validator;
+
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+
+/**
+ * Makes it possible to define dynamic constraints for an object.
+ */
+interface ConstraintProviderInterface
+{
+    /**
+     * Lets the user create dynamic constraints
+     *
+     * @param Mapping\ClassMetadata
+     */
+    public function getConstraints(ClassMetadata $metadata);
+}

src/Symfony/Component/Validator/Validator.php

@@ -57,6 +57,10 @@ class Validator implements ValidatorInterface
     public function validate($object, $groups = null)
     {
         $metadata = $this->metadataFactory->getClassMetadata(get_class($object));
+        
+        if ($object instanceof ConstraintProviderInterface) {
+            $object->getConstraints($metadata);
+        }
 
         $walk = function(GraphWalker $walker, $group) use ($metadata, $object) {
             return $walker->walkObject($metadata, $object, $group, '');

tests/Symfony/Tests/Component/Validator/Fixtures/DynamicConstraintsEntity.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Symfony\Tests\Component\Validator\Fixtures;
+
+use Symfony\Component\Validator\ConstraintProviderInterface;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+
+class DynamicConstraintsEntity implements ConstraintProviderInterface
+{
+    protected $firstValue;
+    
+    public function getSecondValue() {
+        return null;
+    }
+    
+    public function getConstraints(ClassMetadata $metadata)
+    {
+        $metadata->addPropertyConstraint('firstValue', new FailingConstraint());
+        $metadata->addGetterConstraint('secondValue', new FailingConstraint());
+    }
+}

tests/Symfony/Tests/Component/Validator/ValidatorTest.php

@@ -15,10 +15,12 @@ require_once __DIR__.'/Fixtures/Entity.php';
 require_once __DIR__.'/Fixtures/FailingConstraint.php';
 require_once __DIR__.'/Fixtures/FailingConstraintValidator.php';
 require_once __DIR__.'/Fixtures/FakeClassMetadataFactory.php';
+require_once __DIR__.'/Fixtures/DynamicConstraintsEntity.php';
 
 use Symfony\Tests\Component\Validator\Fixtures\Entity;
 use Symfony\Tests\Component\Validator\Fixtures\FakeClassMetadataFactory;
 use Symfony\Tests\Component\Validator\Fixtures\FailingConstraint;
+use Symfony\Tests\Component\Validator\Fixtures\DynamicConstraintsEntity;
 use Symfony\Component\Validator\Validator;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationList;
@@ -121,6 +123,32 @@ class ValidatorTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($violations, $result);
     }
+    
+    public function testValidate_constraintProvider()
+    {
+        $entity = new DynamicConstraintsEntity();
+        $metadata = new ClassMetadata(get_class($entity));
+        $this->factory->addClassMetadata($metadata);
+
+        // Only the constraint of group "Default" failed
+        $violations = new ConstraintViolationList();
+        $violations->add(new ConstraintViolation(
+            '',
+            array(),
+            $entity,
+            'firstValue',
+            ''
+        ));
+        $violations->add(new ConstraintViolation(
+            '',
+            array(),
+            $entity,
+            'secondValue',
+            ''
+        ));
+
+        $this->assertEquals($violations, $this->validator->validate($entity));
+    }
 
     public function testValidateProperty()
     {