001    /*
002      Copyright (C) 2003 <laurent@aopsys.com>
003    
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful,
010      but WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012      GNU Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public License
015      along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
017    
018    package org.objectweb.jac.aspects.idGen;
019    
020    import java.util.Hashtable;
021    import java.util.Map;
022    
023    /**
024     * Stores counters
025     */
026    
027    public class Counters {
028    
029       public Counters() {
030       }
031    
032       /**
033        *  Generate an ID 
034        *  @param name counter name to use to generate the ID
035        */
036        public synchronized long genId(String name) {
037           Long n = (Long)counters.get(name);
038           if (n==null) {
039              n = new Long(1);
040           }
041           long res = n.longValue();
042           counters.put(name,new Long(res+1));
043           return res;
044        }
045    
046        Map counters = new Hashtable();
047    }