Adding the new TreeBehavior file

src/Model/Behavior/TreeBehavior.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         CakePHP(tm) v 3.0.0
+ * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+namespace Cake\Model\Behavior;
+
+use ArrayObject;
+use Cake\Collection\Collection;
+use Cake\Event\Event;
+use Cake\ORM\Behavior;
+use Cake\ORM\Entity;
+use Cake\ORM\Table;
+use Cake\ORM\TableRegistry;
+
+class TreeBehavior extends Behavior {
+
+/**
+ * Table instance
+ *
+ * @var \Cake\ORM\Table
+ */
+	protected $_table;
+
+/**
+ * Default config
+ *
+ * These are merged with user-provided configuration when the behavior is used.
+ *
+ * @var array
+ */
+	protected static $_defaultConfig = [
+		'parent' => 'parent_id',
+		'left' => 'lft',
+		'right' => 'rght',
+		'scope' => null
+	];
+
+/**
+ * Constructor
+ *
+ * @param Table $table The table this behavior is attached to.
+ * @param array $config The config for this behavior.
+ */
+	public function __construct(Table $table, array $config = []) {
+		parent::__construct($table, $config);
+		$this->_table = $table;
+	}
+
+	public function beforeSave(Event $event, $entity) {
+		$config = $this->config();
+
+	}
+
+}