CMPMessage


1   /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10  * the License, or (at your option) any later version.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this software; if not, write to the Free
19  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21  */
22  package org.jboss.ejb.plugins.cmp.jdbc.bridge;
23  
24  import java.io.Serializable  ;
25  import java.io.ObjectStreamException  ;
26  
27  /**
28   * Type safe enumeration of message objects.
29   * Used by optmistic lock to lock fields and its values dependeding
30   * on the strategy used.
31   *
32   * @author <a HREF="mailto:aloubyansky@hotmail.com">Alex Loubyansky</a>
33   * @version $Revision: 37459 $
34   */
35  public final class CMPMessage
36     implements Serializable  
37  {
38     // Constants ------------------------------------------------
39     private static int nextOrdinal = 0;
40     private static final CMPMessage[] VALUES = new CMPMessage[5];
41  
42     public static final CMPMessage CHANGED = new CMPMessage("CHANGED");
43     public static final CMPMessage ACCESSED = new CMPMessage("ACCESSED");
44  
45     private final transient String   name;
46     private final int ordinal;
47  
48     // Constructor ----------------------------------------------
49     private CMPMessage(String   name)
50     {
51        this.name = name;
52        this.ordinal = nextOrdinal++;
53        VALUES[ordinal] = this;
54     }
55  
56     // Public ---------------------------------------------------
57     public String   toString()
58     {
59        return name;
60     }
61  
62     // Package --------------------------------------------------
63     Object   readResolve()
64        throws ObjectStreamException  
65     {
66        return VALUES[ordinal];
67     }
68  }
69
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