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application/Espo/ORM/Relation/EmptyRelations.php

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+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * 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/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\ORM\Relation;
+
+use Espo\ORM\Entity;
+use Espo\ORM\EntityCollection;
+use LogicException;
+use RuntimeException as RuntimeExceptionAlias;
+
+class EmptyRelations implements Relations
+{
+    /** @var array<string, Entity|null> */
+    private array $setData = [];
+
+    public function __construct() {}
+
+    public function resetAll(): void
+    {
+        $this->setData = [];
+    }
+
+    public function reset(string $relation): void
+    {
+        unset($this->setData[$relation]);
+    }
+
+    /**
+     * @param Entity|null $related
+     */
+    public function set(string $relation, Entity|null $related): void
+    {
+        $this->setData[$relation] = $related;
+    }
+
+    public function isSet(string $relation): bool
+    {
+        return array_key_exists($relation, $this->setData);
+    }
+
+    /**
+     * @return Entity|null
+     */
+    public function getSet(string $relation): Entity|null
+    {
+        if (!array_key_exists($relation, $this->setData)) {
+            throw new RuntimeExceptionAlias("Relation '$relation' is not set.");
+        }
+
+        return $this->setData[$relation];
+    }
+
+    public function getOne(string $relation): ?Entity
+    {
+        $entity = $this->setData[$relation] ?? null;
+
+        if ($entity instanceof EntityCollection) {
+            throw new LogicException("Not an entity.");
+        }
+
+        return $entity;
+    }
+
+    /***
+     * @return EntityCollection<Entity>
+     */
+    public function getMany(string $relation): EntityCollection
+    {
+        $collection = $this->setData[$relation] ?? new EntityCollection();
+
+        if (!$collection instanceof EntityCollection) {
+            throw new LogicException("Not a collection.");
+        }
+
+        /** @var EntityCollection<Entity> */
+        return $collection;
+    }
+}