Cache the trees structures for treeViews used in the sidebar.

src/Helpers/TreeViewNode.php

@@ -21,6 +21,10 @@
 
 namespace App\Helpers;
 
+use App\Entity\Base\DBElement;
+use App\Entity\Base\NamedDBElement;
+use App\Entity\Base\StructuralDBElement;
+
 /**
  * This class represents a node for the bootstrap treeview node.
  * When you serialize an array of these objects to JSON, you can use the serialized data in data for the treeview.
@@ -35,6 +39,8 @@ class TreeViewNode
 
     protected $tags;
 
+    protected $id;
+
     /**
      * Creates a new TreeView node with the given parameters.
      *
@@ -53,6 +59,28 @@ class TreeViewNode
         //$this->state = new TreeViewNodeState();
     }
 
+    /**
+     * Return the ID of the entity associated with this node.
+     * Null if this node is not connected with an entity.
+     * @return int|null
+     */
+    public function getId() : ?int
+    {
+        return $this->id;
+    }
+
+    /**
+     * Sets the ID of the entity associated with this node.
+     * Null if this node is not connected with an entity.
+     * @param  int|null  $id
+     * @return $this
+     */
+    public function setId(?int $id): self
+    {
+        $this->id = $id;
+        return $this;
+    }
+
     /**
      * Returns the node text.
      *
@@ -104,7 +132,7 @@ class TreeViewNode
     /**
      * Returns the children nodes of this node.
      *
-     * @return array|null
+     * @return TreeViewNode[]|null
      */
     public function getNodes(): ?array
     {

src/Helpers/Trees/StructuralDBElementIterator.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 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\Helpers\Trees;
+
+
+use App\Entity\Base\StructuralDBElement;
+use Doctrine\Common\Collections\Collection;
+use RecursiveIterator;
+
+class StructuralDBElementIterator extends \ArrayIterator implements \RecursiveIterator
+{
+    /**
+     * @param $nodes Collection<StructuralDBElement>|StructuralDBElement[]
+     */
+    public function __construct($nodes)
+    {
+        parent::__construct($nodes);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasChildren()
+    {
+        /** @var StructuralDBElement $element */
+        $element = $this->current();
+        return !empty($element->getSubelements());
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getChildren()
+    {
+        /** @var StructuralDBElement $element */
+        $element = $this->current();
+        return new StructuralDBElementIterator($element->getSubelements()->toArray());
+    }
+}

src/Helpers/Trees/TreeViewNodeIterator.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 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\Helpers\Trees;
+
+use App\Helpers\TreeViewNode;
+
+class TreeViewNodeIterator extends \ArrayIterator implements \RecursiveIterator
+{
+
+    /**
+     * @param $nodes TreeViewNode[]
+     */
+    public function __construct($nodes)
+    {
+        parent::__construct($nodes);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasChildren()
+    {
+        /** @var TreeViewNode $element */
+        $element = $this->current();
+        return !empty($element->getNodes());
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getChildren()
+    {
+        /** @var TreeViewNode $element */
+        $element = $this->current();
+        return new TreeViewNodeIterator($element->getNodes());
+    }
+}