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COOS - Connected Objects Operating System ( Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved. DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. This library is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <>. You may also contact one of the following for additional information: Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway ( Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (
package org.coos.messaging.util;

Knut Eilif Husa, Tellu AS Generator of UUIDs
public class UuidGenerator {
	private static final String UNIQUE_STUB;
	private static int instanceCount;
	private static String hostName;
	private String seed;
	private long sequence;
	public static final String UUID = "UUID-";
	static {
		String stub = "";
		 = "localhost";
		stub = "-1-" + System.currentTimeMillis() + "-";
		 = stub;

Construct an IdGenerator
	public UuidGenerator(String prefix) {
		synchronized () {
			this. = prefix +  + (++) + "-";
	public UuidGenerator() {
		this( + );

As we have to find the hostname as a side-affect of generating a unique stub, we allow it's easy retrevial here

the local host name
	public static String getHostName() {
		return ;

Generate a unqiue id

a unique id
	public synchronized String generateId() {
		return this. + (this.++);

Generate a unique ID - that is friendly for a URL or file system

a unique id
		String result = generateId();
		result = result.replace(':''-');
		result = result.replace('_''-');
		result = result.replace('.''-');
		return result;
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