01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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: 57209 $
34: */
35: public final class CMPMessage implements Serializable {
36: static final long serialVersionUID = -5463196805602475992L;
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: this .name = name;
51: this .ordinal = nextOrdinal++;
52: VALUES[ordinal] = this ;
53: }
54:
55: // Public ---------------------------------------------------
56: public String toString() {
57: return name;
58: }
59:
60: // Package --------------------------------------------------
61: Object readResolve() throws ObjectStreamException {
62: return VALUES[ordinal];
63: }
64: }
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