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vendor/symfony/serializer/Normalizer/ObjectToPopulateTrait.php

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+<?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\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 string|null $key   They in which to look for the object to populate.
+     *                           Keeps backwards compatibility with `AbstractNormalizer`.
+     */
+    protected function extractObjectToPopulate(string $class, array $context, ?string $key = null): ?object
+    {
+        $key ??= AbstractNormalizer::OBJECT_TO_POPULATE;
+
+        if (isset($context[$key]) && \is_object($context[$key]) && $context[$key] instanceof $class) {
+            return $context[$key];
+        }
+
+        return null;
+    }
+}