private void showAllNodesOnTree(UrlNode node , int i ){
		
		System.out.println("Level : " + i + " , Path : " + node.selfUrl + " , parentUrl : " + node.parentUrl + " , childNum :" + node.childNodes.size() );
		
		if( node.childNodes == null || node.childNodes.size() == 0)
			return ;
		for(UrlNode nodes : node.childNodes){
			showAllNodesOnTree(nodes , i + 1) ;
		}
	}