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Java > Open Source Codes > de > nava > informa > impl > basic > IdGenerator


1 //
2 // Informa -- RSS Library for Java
3 // Copyright (c) 2002 by Niko Schmuck
4 //
5 // Niko Schmuck
6 // http://sourceforge.net/projects/informa
7 // mailto:niko_schmuck@users.sourceforge.net
8 //
9 // This library is free software.
10 //
11 // You may redistribute it and/or modify it under the terms of the GNU
12 // Lesser General Public License as published by the Free Software Foundation.
13 //
14 // Version 2.1 of the license should be included with this distribution in
15 // the file LICENSE. If the license is not included with this distribution,
16 // you may find a copy at the FSF web site at 'www.gnu.org' or 'www.fsf.org',
17 // or you may write to the Free Software Foundation, 675 Mass Ave, Cambridge,
18 // MA 02139 USA.
19 //
20 // This library is distributed in the hope that it will be useful,
21 // but WITHOUT ANY WARRANTY; without even the implied waranty of
22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 // Lesser General Public License for more details.
24 //
25
26
27 // $Id: IdGenerator.java,v 1.5 2003/06/27 07:55:02 niko_schmuck Exp $
28
29 package de.nava.informa.impl.basic;
30
31 import java.util.Random JavaDoc;
32
33 /**
34  * Identity generator implemented as singleton for generating positive
35  * random integers to be used as identify uniquely news channels,
36  * items.
37  *
38  * @author Niko Schmuck (niko@nava.de)
39  */
40 import de.nava.informa.core.IdGeneratorIF;
41
42 public class IdGenerator implements IdGeneratorIF {
43
44   private static IdGenerator instance;
45   /** used for creating unique item IDs. */
46   private static transient Random JavaDoc rand;
47   
48   private IdGenerator() {
49     rand = new Random JavaDoc(System.currentTimeMillis());
50   }
51
52   public static IdGenerator getInstance() {
53     if (instance == null) {
54       instance = new IdGenerator();
55     }
56     return instance;
57   }
58
59   public long getId() {
60     return 100000l + Math.abs(rand.nextInt());
61   }
62   
63 }
64
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