NodeSet.php

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<?php
namespace Magento\Framework\DB\Tree;

class NodeSet implements \Iterator, \Countable
{
    private $_nodes;

    private $_current;

    private $_currentNode;

    private $count;

    public function __construct()
    {
        $this->_nodes = [];
        $this->_current = 0;
        $this->_currentNode = 0;
        $this->count = 0;
    }

    public function addNode(Node $node)
    {
        $this->_nodes[$this->_currentNode] = $node;
        $this->count++;
        return ++$this->_currentNode;
    }

    public function count()
    {
        return $this->count;
    }

    public function valid()
    {
        return isset($this->_nodes[$this->_current]);
    }

    public function next()
    {
        if ($this->_current > $this->_currentNode) {
            return false;
        } else {
            return $this->_current++;
        }
    }

    public function key()
    {
        return $this->_current;
    }

    public function current()
    {
        return $this->_nodes[$this->_current];
    }

    public function rewind()
    {
        $this->_current = 0;
    }
}