Started implementing building blocks for the merge system

src/Services/EntityMergers/Mergers/EntityMergerInterface.php

@@ -0,0 +1,47 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\Services\EntityMergers\Mergers;
+
+
+interface EntityMergerInterface
+{
+    /**
+     * Determines if this merger supports merging the other entity into the target entity.
+     * @param  object  $target
+     * @param  object  $other
+     * @param  array  $context
+     * @return bool True if this merger supports merging the other entity into the target entity, false otherwise
+     */
+    public function supports(object $target, object $other, array $context = []): bool;
+
+    /**
+     * Merge the other entity into the target entity.
+     * The target entity will be modified and returned.
+     * @param  object  $target
+     * @param  object  $other
+     * @param  array  $context
+     * @return object
+     */
+    public function merge(object $target, object $other, array $context = []): object;
+}