Chris@14: <?php
Chris@14: 
Chris@14: /*
Chris@14:  * This file is part of the Symfony package.
Chris@14:  *
Chris@14:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@14:  *
Chris@14:  * For the full copyright and license information, please view the LICENSE
Chris@14:  * file that was distributed with this source code.
Chris@14:  */
Chris@14: 
Chris@14: namespace Symfony\Component\Serializer\Normalizer;
Chris@14: 
Chris@14: trait ObjectToPopulateTrait
Chris@14: {
Chris@14:     /**
Chris@14:      * Extract the `object_to_populate` field from the context if it exists
Chris@14:      * and is an instance of the provided $class.
Chris@14:      *
Chris@14:      * @param string $class The class the object should be
Chris@14:      * @param $context The denormalization context
Chris@14:      * @param string $key They in which to look for the object to populate.
Chris@14:      *                    Keeps backwards compatibility with `AbstractNormalizer`.
Chris@14:      *
Chris@14:      * @return object|null an object if things check out, null otherwise
Chris@14:      */
Chris@14:     protected function extractObjectToPopulate($class, array $context, $key = null)
Chris@14:     {
Chris@14:         $key = $key ?: 'object_to_populate';
Chris@14: 
Chris@17:         if (isset($context[$key]) && \is_object($context[$key]) && $context[$key] instanceof $class) {
Chris@14:             return $context[$key];
Chris@14:         }
Chris@14: 
Chris@14:         return null;
Chris@14:     }
Chris@14: }