--- /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\Config\Loader;
+
+use Symfony\Component\Config\Exception\FileLoaderLoadException;
+
+/**
+ * Loader is the abstract class used by all built-in loaders.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Loader implements LoaderInterface
+{
+ protected $resolver;
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getResolver()
+ {
+ return $this->resolver;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setResolver(LoaderResolverInterface $resolver)
+ {
+ $this->resolver = $resolver;
+ }
+
+ /**
+ * Imports a resource.
+ *
+ * @param mixed $resource A resource
+ * @param string|null $type The resource type or null if unknown
+ *
+ * @return mixed
+ */
+ public function import($resource, $type = null)
+ {
+ return $this->resolve($resource, $type)->load($resource, $type);
+ }
+
+ /**
+ * Finds a loader able to load an imported resource.
+ *
+ * @param mixed $resource A resource
+ * @param string|null $type The resource type or null if unknown
+ *
+ * @return $this|LoaderInterface
+ *
+ * @throws FileLoaderLoadException If no loader is found
+ */
+ public function resolve($resource, $type = null)
+ {
+ if ($this->supports($resource, $type)) {
+ return $this;
+ }
+
+ $loader = null === $this->resolver ? false : $this->resolver->resolve($resource, $type);
+
+ if (false === $loader) {
+ throw new FileLoaderLoadException($resource);
+ }
+
+ return $loader;
+ }
+}