001 package org.hackystat.utilities.tstamp; 002 003 import java.io.Serializable; 004 import java.util.Comparator; 005 006 import javax.xml.datatype.XMLGregorianCalendar; 007 008 /** 009 * Implements a comparator for XMLGregorianCalendar instances consistent with the Tstamp operations. 010 * @author Philip Johnson 011 */ 012 public class TstampComparator implements Serializable, Comparator<XMLGregorianCalendar> { 013 014 /** For serialization. */ 015 private static final long serialVersionUID = 1L; 016 017 /** 018 * Compares the two instances. 019 * @param tstamp1 The first tstamp. 020 * @param tstamp2 The second tstamp. 021 * @return -1, 0, or +1 depending. 022 */ 023 public int compare(XMLGregorianCalendar tstamp1, XMLGregorianCalendar tstamp2) { 024 if (Tstamp.greaterThan(tstamp1, tstamp2)) { 025 return 1; 026 } 027 else if (Tstamp.lessThan(tstamp1, tstamp2)) { 028 return -1; 029 } 030 else { 031 return 0; 032 } 033 } 034 }