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UniqueIdGenerator.java

00001 /*
00002  * OpenMobileIS - a free Java(TM) Framework for mobile applications Java(TM)
00003  * Copyright (C) 2004-2005 Philippe Delrieu
00004  * All rights reserved.
00005  * Contact: openmobileis@e-care.fr
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
00020  * USA
00021  *
00022  *  Author : Philippe Delrieu
00023  *  
00024  *  Modifications :
00025  *  2004 Creation P.Delrieu
00026  * 
00027  */
00028 
00029 package org.openmobileis.embedded.util;
00030 
00042 public final class UniqueIdGenerator {
00043   
00044   private static UniqueIdGenerator manager;
00045   private String pdaId;
00046   private long currentId = 0;
00047   private int counter = 0;
00048 
00050   public UniqueIdGenerator() {
00051   }
00052   public static UniqueIdGenerator getManager () {
00053     if (manager == null) {
00054       synchronized (UniqueIdGenerator.class) {
00055         if (manager == null)  {
00056           manager = new UniqueIdGenerator();
00057         }
00058       }
00059     }
00060     return manager;
00061   }
00062 
00063   // means representant Id
00064   public String getPdaId() {
00065     return pdaId;
00066   }
00067 
00068   public String getNextId () {
00069                 return Long.toString(this.getLongNextId ());
00070   }
00071 
00072 /*  public long getLongNextId () {
00073     long nextId = org.openmobileis.embedded.util.SystemAPI.currentTimeInMillis();
00074     if (nextId == this.currentId) {
00075        counter++;
00076        nextId = nextId + counter;
00077     } else {
00078       currentId = nextId;
00079       counter = 0;
00080     }
00081     return currentId;
00082   } */
00083   
00084   public long getLongNextId () {
00085         long nextId = org.openmobileis.embedded.util.SystemAPI.currentTimeInMillis();
00086         if (nextId <= this.currentId+counter) {
00087            counter++;
00088            nextId = nextId + counter;
00089         } else {
00090           currentId = nextId;
00091           counter = 0;
00092         }
00093         return nextId;
00094   }
00095 
00096 }

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