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vendor/symfony/framework-bundle/DependencyInjection/Compiler/AddConstraintValidatorsPass.php

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+<?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\Bundle\FrameworkBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+
+class AddConstraintValidatorsPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('validator.validator_factory')) {
+            return;
+        }
+
+        $validators = array();
+        foreach ($container->findTaggedServiceIds('validator.constraint_validator') as $id => $attributes) {
+            if (isset($attributes[0]['alias'])) {
+                $validators[$attributes[0]['alias']] = $id;
+            }
+
+            $validators[$container->getDefinition($id)->getClass()] = $id;
+        }
+
+        $container->getDefinition('validator.validator_factory')->replaceArgument(1, $validators);
+    }
+}