<?php
/**
 * Magento Commercial Edition
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Magento Commercial Edition License
 * that is available at: http://www.magentocommerce.com/license/commercial-edition
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Varien
 * @package     Varien_Db
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://www.magentocommerce.com/license/commercial-edition
 */


/**
 * TODO implements iterators
 *
 */
class Varien_Db_Tree_NodeSet implements Iterator
{
    private $_nodes = array();
    private $_currentNode = 0;
    private $_current = 0;


    function __construct() {
        $this->_nodes = array();
        $this->_current = 0;
        $this->_currentNode = 0;
        $this->count = 0;
    }



    function addNode(Varien_Db_Tree_Node $node) {
        $this->_nodes[$this->_currentNode] = $node;
        $this->count++;
        return ++$this->_currentNode;
    }

    function count() {
        return $this->count;
    }


    function valid() {
        return  isset($this->_nodes[$this->_current]);
    }

    function next() {
        if ($this->_current > $this->_currentNode) {
            return false;
        } else {
            return  $this->_current++;
        }
    }

    function key() {
        return $this->_current;
    }


    function current() {
        return $this->_nodes[$this->_current];
    }

    function rewind() {
        $this->_current = 0;
    }
}