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

vendor/symfony/serializer/Mapping/Factory/ClassMetadataFactory.php

@@ -0,0 +1,118 @@
+<?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\Factory;
+
+use Doctrine\Common\Cache\Cache;
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Mapping\ClassMetadata;
+use Symfony\Component\Serializer\Mapping\Loader\LoaderInterface;
+
+/**
+ * Returns a {@link ClassMetadata}.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class ClassMetadataFactory implements ClassMetadataFactoryInterface
+{
+    /**
+     * @var LoaderInterface
+     */
+    private $loader;
+    /**
+     * @var Cache
+     */
+    private $cache;
+    /**
+     * @var array
+     */
+    private $loadedClasses;
+
+    /**
+     * @param LoaderInterface $loader
+     * @param Cache|null      $cache
+     */
+    public function __construct(LoaderInterface $loader, Cache $cache = null)
+    {
+        $this->loader = $loader;
+        $this->cache = $cache;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getMetadataFor($value)
+    {
+        $class = $this->getClass($value);
+        if (!$class) {
+            throw new InvalidArgumentException(sprintf('Cannot create metadata for non-objects. Got: "%s"', gettype($value)));
+        }
+
+        if (isset($this->loadedClasses[$class])) {
+            return $this->loadedClasses[$class];
+        }
+
+        if ($this->cache && ($this->loadedClasses[$class] = $this->cache->fetch($class))) {
+            return $this->loadedClasses[$class];
+        }
+
+        if (!class_exists($class) && !interface_exists($class)) {
+            throw new InvalidArgumentException(sprintf('The class or interface "%s" does not exist.', $class));
+        }
+
+        $classMetadata = new ClassMetadata($class);
+        $this->loader->loadClassMetadata($classMetadata);
+
+        $reflectionClass = $classMetadata->getReflectionClass();
+
+        // Include metadata from the parent class
+        if ($parent = $reflectionClass->getParentClass()) {
+            $classMetadata->merge($this->getMetadataFor($parent->name));
+        }
+
+        // Include metadata from all implemented interfaces
+        foreach ($reflectionClass->getInterfaces() as $interface) {
+            $classMetadata->merge($this->getMetadataFor($interface->name));
+        }
+
+        if ($this->cache) {
+            $this->cache->save($class, $classMetadata);
+        }
+
+        return $this->loadedClasses[$class] = $classMetadata;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasMetadataFor($value)
+    {
+        $class = $this->getClass($value);
+
+        return class_exists($class) || interface_exists($class);
+    }
+
+    /**
+     * Gets a class name for a given class or instance.
+     *
+     * @param mixed $value
+     *
+     * @return string|bool
+     */
+    private function getClass($value)
+    {
+        if (!is_object($value) && !is_string($value)) {
+            return false;
+        }
+
+        return ltrim(is_object($value) ? get_class($value) : $value, '\\');
+    }
+}