Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/validator/Mapping/Loader/FilesLoader.php

@@ -0,0 +1,61 @@
+<?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;
+
+/**
+ * Base loader for loading validation metadata from a list of files.
+ *
+ * @author Bulat Shakirzyanov <mallluhuct@gmail.com>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @see YamlFilesLoader
+ * @see XmlFilesLoader
+ */
+abstract class FilesLoader extends LoaderChain
+{
+    /**
+     * Creates a new loader.
+     *
+     * @param array $paths An array of file paths
+     */
+    public function __construct(array $paths)
+    {
+        parent::__construct($this->getFileLoaders($paths));
+    }
+
+    /**
+     * Returns an array of file loaders for the given file paths.
+     *
+     * @param array $paths An array of file paths
+     *
+     * @return LoaderInterface[] The metadata loaders
+     */
+    protected function getFileLoaders($paths)
+    {
+        $loaders = array();
+
+        foreach ($paths as $path) {
+            $loaders[] = $this->getFileLoaderInstance($path);
+        }
+
+        return $loaders;
+    }
+
+    /**
+     * Creates a loader for the given file path.
+     *
+     * @param string $path The file path
+     *
+     * @return LoaderInterface The created loader
+     */
+    abstract protected function getFileLoaderInstance($path);
+}