--- /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\Serializer\Mapping\Loader;
+
+use Symfony\Component\Serializer\Exception\MappingException;
+use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
+
+/**
+ * Calls multiple {@link LoaderInterface} instances in a chain.
+ *
+ * This class accepts multiple instances of LoaderInterface to be passed to the
+ * constructor. When {@link loadClassMetadata()} is called, the same method is called
+ * in <em>all</em> of these loaders, regardless of whether any of them was
+ * successful or not.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class LoaderChain implements LoaderInterface
+{
+ /**
+ * @var LoaderInterface[]
+ */
+ private $loaders;
+
+ /**
+ * Accepts a list of LoaderInterface instances.
+ *
+ * @param LoaderInterface[] $loaders An array of LoaderInterface instances
+ *
+ * @throws MappingException If any of the loaders does not implement LoaderInterface
+ */
+ 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(ClassMetadataInterface $metadata)
+ {
+ $success = false;
+
+ foreach ($this->loaders as $loader) {
+ $success = $loader->loadClassMetadata($metadata) || $success;
+ }
+
+ return $success;
+ }
+}