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.lock;
23:
24: import java.io.Serializable;
25: import java.io.ObjectStreamException;
26:
27: /**
28: * This type safe enumeration s used to mark an invocation as non-entrant.
29: *
30: * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
31: * @version $Revision: 57209 $
32: */
33: public final class Entrancy implements Serializable {
34: static final long serialVersionUID = -7930536165138213801L;
35:
36: public static final Entrancy ENTRANT = new Entrancy(true);
37: public static final Entrancy NON_ENTRANT = new Entrancy(false);
38:
39: private final transient boolean value;
40:
41: private Entrancy(boolean value) {
42: this .value = value;
43: }
44:
45: public String toString() {
46: if (value) {
47: return "ENTRANT";
48: } else {
49: return "NON_ENTRANT";
50: }
51: }
52:
53: Object readResolve() throws ObjectStreamException {
54: if (value) {
55: return ENTRANT;
56: } else {
57: return NON_ENTRANT;
58: }
59: }
60:
61: }
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