[ticket/11495] Add basic interface with nestedset operations

PHPBB3-11495

phpBB/includes/nestedset/item/interface.php

@@ -0,0 +1,61 @@
+<?php
+/**
+*
+* @package Nested Set
+* @copyright (c) 2013 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+interface phpbb_nestedset_item_interface
+{
+	/**
+	* Returns the ID of the item
+	*
+	* @return int
+	*/
+	public function get_item_id();
+
+	/**
+	* Returns the ID of the parent item
+	*
+	* @return int
+	*/
+	public function get_parent_id();
+
+	/**
+	* Returns a serialized or empty string with the data of the item's parents
+	*
+	* @return string
+	*/
+	public function get_item_parents_data();
+
+	/**
+	* Returns the left_id of the item
+	*
+	* @return int
+	*/
+	public function get_left_id();
+
+	/**
+	* Returns the right_id of the item
+	*
+	* @return int
+	*/
+	public function get_right_id();
+
+	/**
+	* Does the item have sub-items?
+	*
+	* @return bool
+	*/
+	public function has_children();
+}