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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.common.util;
00030 
00031 import org.openmobileis.common.context.SessionContext;
00032 import org.openmobileis.common.context.SessionContextManager;
00033 
00044 public final class UniqueIdGenerator {
00045   
00046   private static UniqueIdGenerator manager;
00047   private static long oldID = 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   public synchronized long getNewID()  {
00064     long id = System.currentTimeMillis() - (943293708615L);  // to have int conversion positive
00065     while (id < oldID)  {
00066       id ++;
00067     }
00068     oldID = ++id;
00069     return oldID;
00070   }
00071 
00072   
00073   public String getNewStringID() {
00074     String longid = Long.toString(this.getNewID());
00075     SessionContext context = SessionContextManager.getManager().getSessionContext();
00076     if (context != null)  {
00077       String userid = context.getUserId();
00078       if (userid != null) {
00079         longid = userid+longid;
00080       }
00081     }   
00082     return longid;
00083   }
00084 
00085 }

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