--- /dev/null
+<?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\Mapping\Loader;
+
+use Symfony\Component\Validator\Exception\MappingException;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+
+/**
+ * Loads validation metadata from multiple {@link LoaderInterface} instances.
+ *
+ * Pass the loaders when constructing the chain. Once
+ * {@link loadClassMetadata()} is called, that method will be called on all
+ * loaders in the chain.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class LoaderChain implements LoaderInterface
+{
+ /**
+ * @var LoaderInterface[]
+ */
+ protected $loaders;
+
+ /**
+ * @param LoaderInterface[] $loaders The metadata loaders to use
+ *
+ * @throws MappingException If any of the loaders has an invalid type
+ */
+ public function __construct(array $loaders)
+ {
+ foreach ($loaders as $loader) {
+ if (!$loader instanceof LoaderInterface) {
+ throw new MappingException(sprintf('Class %s is expected to implement LoaderInterface', get_class($loader)));
+ }
+ }
+
+ $this->loaders = $loaders;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function loadClassMetadata(ClassMetadata $metadata)
+ {
+ $success = false;
+
+ foreach ($this->loaders as $loader) {
+ $success = $loader->loadClassMetadata($metadata) || $success;
+ }
+
+ return $success;
+ }
+}