private String makeTreeNodeId(int level, int siblingNumber)
public String makeTreeNodeId(int level, TreeNode parent, int siblingNumber)
  private String makeTreeNodeId(int level, int siblingNumber)  {    return    	"TREENODE_LEVEL" + Constants.DELIMITER + level + Constants.DELIMITER + "SIBLINGNUMBER" + Constants.DELIMITER + siblingNumber + Constants.DELIMITER + "ID";  }