Added a basic show category parts page with datatable

src/Services/EntityURLGenerator.php

@@ -0,0 +1,90 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 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 General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Services;
+
+
+use App\Entity\DBElement;
+use App\Entity\NamedDBElement;
+use App\Entity\Part;
+use App\Exceptions\EntityNotSupported;
+use Doctrine\Migrations\Finder\Exception\NameIsReserved;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+class EntityURLGenerator
+{
+    /**
+     * @var UrlGeneratorInterface
+     */
+    protected $urlGenerator;
+
+    public function __construct(UrlGeneratorInterface $urlGenerator)
+    {
+        $this->urlGenerator = $urlGenerator;
+    }
+
+    /**
+     * Generates an URL to a page, where info about this entity can be viewed.
+     * @param $entity mixed The entity for which the info should be generated.
+     * @return string The URL to the info page
+     *
+     * @throws EntityNotSupported If the method is not supported for the given Entity
+     */
+    public function infoURL($entity) : string
+    {
+        if($entity instanceof Part)
+        {
+            return $this->urlGenerator->generate('part_info', ['id' => $entity->getID()]);
+        }
+
+        //Otherwise throw an error
+        throw new EntityNotSupported('The given entity is not supported yet!');
+    }
+
+    /**
+     * Generates an HTML link to the info page about the given entity.
+     * @param $entity mixed The entity for which the info link should be generated.
+     * @return string The HTML of the info page link
+     *
+     * @throws EntityNotSupported
+     */
+    public function infoHTML($entity) : string
+    {
+        $href = $this->infoURL($entity);
+
+        if($entity instanceof NamedDBElement)
+        {
+            return sprintf('<a href="%s">%s</a>', $href, $entity->getName());
+        }
+
+    }
+
+}