1 package com.thaiopensource.validate; 2 3 /** 4 * A class with a unique value, used as the value of properties whose 5 * significance is purely whether or not they are present in the 6 * PropertyMap. 7 */ 8 public class Flag { 9 private Flag() { } 10 /** 11 * The unique value of this class. 12 */ 13 public static final Flag PRESENT = new Flag(); 14 } 15