001: /*--
002:
003: Copyright (C) 2002 Anthony Eden.
004: All rights reserved.
005:
006: Redistribution and use in source and binary forms, with or without
007: modification, are permitted provided that the following conditions
008: are met:
009:
010: 1. Redistributions of source code must retain the above copyright
011: notice, this list of conditions, and the following disclaimer.
012:
013: 2. Redistributions in binary form must reproduce the above copyright
014: notice, this list of conditions, and the disclaimer that follows
015: these conditions in the documentation and/or other materials
016: provided with the distribution.
017:
018: 3. The names "OBE" and "Open Business Engine" must not be used to
019: endorse or promote products derived from this software without prior
020: written permission. For written permission, please contact
021: me@anthonyeden.com.
022:
023: 4. Products derived from this software may not be called "OBE" or
024: "Open Business Engine", nor may "OBE" or "Open Business Engine"
025: appear in their name, without prior written permission from
026: Anthony Eden (me@anthonyeden.com).
027:
028: In addition, I request (but do not require) that you include in the
029: end-user documentation provided with the redistribution and/or in the
030: software itself an acknowledgement equivalent to the following:
031: "This product includes software developed by
032: Anthony Eden (http://www.anthonyeden.com/)."
033:
034: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
035: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
036: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
037: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
038: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
039: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
040: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
041: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
042: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
043: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
044: POSSIBILITY OF SUCH DAMAGE.
045:
046: For more information on OBE, please see <http://obe.sourceforge.net/>.
047:
048: */
049:
050: package org.obe.designer.util;
051:
052: import org.doomdark.uuid.UUIDGenerator;
053:
054: import org.apache.commons.logging.Log;
055: import org.apache.commons.logging.LogFactory;
056:
057: /** Utility class for generating universal unique IDs.
058:
059: @author Anthony Eden
060: */
061:
062: public class UUID {
063:
064: private static final Log log = LogFactory.getLog(UUID.class);
065:
066: /** Noop constructor. */
067:
068: private UUID() {
069: // no op
070: }
071:
072: /** Generate a Universal unique ID.
073:
074: @return The id String
075: */
076:
077: public static String generate() {
078: log.info("Generating unique ID");
079: String id = UUIDGenerator.getInstance().generateTimeBasedUUID()
080: .toString();
081: log.info("Generation complete");
082: return id;
083: }
084:
085: /** Generate a Universal unique ID if the specified ID is null or
086: an empty String.
087:
088: @param id The current ID
089: @return The current ID or a new UUID
090: */
091:
092: public static String generate(String id) {
093: if (id == null || id.equals("")) {
094: return UUIDGenerator.getInstance().generateTimeBasedUUID()
095: .toString();
096: } else {
097: return id;
098: }
099: }
100:
101: }
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