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backend/vendor/symfony/doctrine-bridge/Security/User/UserLoaderInterface.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\Bridge\Doctrine\Security\User;
+
+use Symfony\Component\Security\Core\User\UserInterface;
+
+/**
+ * Represents a class that loads UserInterface objects from Doctrine source for the authentication system.
+ *
+ * This interface is meant to facilitate the loading of a User from Doctrine source using a custom method.
+ * If you want to implement your own logic of retrieving the user from Doctrine your repository should implement this
+ * interface.
+ *
+ * @see UserInterface
+ *
+ * @author Michal Trojanowski <michal@kmt-studio.pl>
+ */
+interface UserLoaderInterface
+{
+    /**
+     * Loads the user for the given user identifier (e.g. username or email).
+     *
+     * This method must return null if the user is not found.
+     */
+    public function loadUserByIdentifier(string $identifier): ?UserInterface;
+}