is::makeNext

private function makeNext()
{
	$next = $this->queueShift();
	$bundle = $this->getBundleFromFile($next);

	if(!empty($bundle))
	{
		foreach($bundle as $item)
		{
			$this->putToGroups($item);

			if($item['CHILDREN_COUNT'] > 0)
				$this->queue[] = $item['ID'];
		}
	}

	return empty($this->queue);
}