Counters


1   /*
2     Copyright (C) 2003 <laurent@aopsys.com>
3   
4     This program is free software; you can redistribute it and/or modify
5     it under the terms of the GNU Lesser General Public License as
6     published by the Free Software Foundation; either version 2 of the
7     License, or (at your option) any later version.
8   
9     This program is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12    GNU Lesser General Public License for more details.
13  
14    You should have received a copy of the GNU Lesser General Public License
15    along with this program; if not, write to the Free Software
16    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
17  
18  package org.objectweb.jac.aspects.idGen;
19  
20  import java.util.Hashtable  ;
21  import java.util.Map  ;
22  
23  /**
24   * Stores counters
25   */
26  
27  public class Counters {
28  
29     public Counters() {
30     }
31  
32     /**
33      *  Generate an ID 
34      *  @param name counter name to use to generate the ID
35      */
36      public synchronized long genId(String   name) {
37         Long   n = (Long  )counters.get(name);
38         if (n==null) {
39            n = new Long  (1);
40         }
41         long res = n.longValue();
42         counters.put(name,new Long  (res+1));
43         return res;
44      }
45  
46      Map   counters = new Hashtable  ();
47  }
48

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