Extract entity functionality into traits and interfaces

Co-authored-by: jbtronics <5410681+jbtronics@users.noreply.github.com>

src/Entity/Contracts/CompanyInterface.php

@@ -0,0 +1,57 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2022 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\Entity\Contracts;
+
+/**
+ * Interface for company entities (suppliers, manufacturers).
+ */
+interface CompanyInterface
+{
+    /**
+     * Get the address.
+     *
+     * @return string the address of the company (with "\n" as line break)
+     */
+    public function getAddress(): string;
+
+    /**
+     * Get the phone number.
+     *
+     * @return string the phone number of the company
+     */
+    public function getPhoneNumber(): string;
+
+    /**
+     * Get the e-mail address.
+     *
+     * @return string the e-mail address of the company
+     */
+    public function getEmailAddress(): string;
+
+    /**
+     * Get the website.
+     *
+     * @return string the website of the company
+     */
+    public function getWebsite(): string;
+}