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vendor/symfony/framework-bundle/DependencyInjection/Compiler/AddCacheClearerPass.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;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Registers the cache clearers.
+ *
+ * @author Dustin Dobervich <ddobervich@gmail.com>
+ */
+class AddCacheClearerPass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('cache_clearer')) {
+            return;
+        }
+
+        $clearers = array();
+        foreach ($container->findTaggedServiceIds('kernel.cache_clearer') as $id => $attributes) {
+            $clearers[] = new Reference($id);
+        }
+
+        $container->getDefinition('cache_clearer')->replaceArgument(0, $clearers);
+    }
+}