01: /*--
02:
03: Copyright (C) 2002-2005 Adrian Price.
04: All rights reserved.
05:
06: Redistribution and use in source and binary forms, with or without
07: modification, are permitted provided that the following conditions
08: are met:
09:
10: 1. Redistributions of source code must retain the above copyright
11: notice, this list of conditions, and the following disclaimer.
12:
13: 2. Redistributions in binary form must reproduce the above copyright
14: notice, this list of conditions, and the disclaimer that follows
15: these conditions in the documentation and/or other materials
16: provided with the distribution.
17:
18: 3. The names "OBE" and "Open Business Engine" must not be used to
19: endorse or promote products derived from this software without prior
20: written permission. For written permission, please contact
21: adrianprice@sourceforge.net.
22:
23: 4. Products derived from this software may not be called "OBE" or
24: "Open Business Engine", nor may "OBE" or "Open Business Engine"
25: appear in their name, without prior written permission from
26: Adrian Price (adrianprice@users.sourceforge.net).
27:
28: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
29: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
30: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
31: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
32: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
33: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
34: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
36: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
37: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: POSSIBILITY OF SUCH DAMAGE.
39:
40: For more information on OBE, please see
41: <http://obe.sourceforge.net/>.
42:
43: */
44:
45: package org.obe.util;
46:
47: import org.apache.commons.logging.Log;
48: import org.apache.commons.logging.LogFactory;
49: import org.doomdark.uuid.UUIDGenerator;
50:
51: /**
52: * Utility class for generating universal unique IDs.
53: *
54: * @author Anthony Eden
55: */
56: public final class UUID {
57: private static final Log log = LogFactory.getLog(UUID.class
58: .getName());
59:
60: /**
61: * Noop constructor.
62: */
63: private UUID() {
64: }
65:
66: /**
67: * Generate a Universal unique ID.
68: *
69: * @return The id String
70: */
71: public static String generate() {
72: log.debug("Generating unique ID");
73: String id = UUIDGenerator.getInstance().generateTimeBasedUUID()
74: .toString();
75: log.debug("Generation complete");
76: return id;
77: }
78:
79: /**
80: * Generate a Universal unique ID if the specified ID is null or
81: * an empty String.
82: *
83: * @param id The current ID
84: * @return The current ID or a new UUID
85: */
86:
87: public static String generate(String id) {
88: if (id == null || id.length() == 0) {
89: return UUIDGenerator.getInstance().generateTimeBasedUUID()
90: .toString();
91: } else {
92: return id;
93: }
94: }
95: }
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