/usr/share/php/Symfony/Component/Serializer/Normalizer/ObjectToPopulateTrait.php is in php-symfony-serializer 3.4.6+dfsg-1.
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/*
* 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\Normalizer;
trait ObjectToPopulateTrait
{
/**
* Extract the `object_to_populate` field from the context if it exists
* and is an instance of the provided $class.
*
* @param string $class The class the object should be
* @param $context The denormalization context
* @param string $key They in which to look for the object to populate.
* Keeps backwards compatibility with `AbstractNormalizer`.
*
* @return object|null an object if things check out, null otherwise
*/
protected function extractObjectToPopulate($class, array $context, $key = null)
{
$key = $key ?: 'object_to_populate';
if (isset($context[$key]) && is_object($context[$key]) && $context[$key] instanceof $class) {
return $context[$key];
}
return null;
}
}
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