/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package de.kp.wsclient.util; import java.net.InetAddress; import java.net.UnknownHostException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Random; /** * UUID generator (taken from Axis2) */ public class UUIDGenerator { private static String baseUUID = null; private static long incrementingValue = 0; private static Random myRand = null; /** * MD5 a random string with localhost/date etc will return 128 bits * construct a string of 18 characters from those bits. * * @return string */ public static synchronized String getUUID() { if (baseUUID == null) { getInitialUUID(); } long i = ++incrementingValue; if(i >= Long.MAX_VALUE || i < 0){ incrementingValue = 0; i = 0; } return baseUUID + System.currentTimeMillis() + i; } protected static synchronized void getInitialUUID() { if (baseUUID != null) { return; } if (myRand == null) { myRand = new Random(); } long rand = myRand.nextLong(); String sid; try { sid = InetAddress.getLocalHost().toString(); } catch (UnknownHostException e) { sid = Thread.currentThread().getName(); } StringBuilder sb = new StringBuilder(); sb.append(sid); sb.append(":"); sb.append(Long.toString(rand)); MessageDigest md5 = null; try { md5 = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { } md5.update(sb.toString().getBytes()); byte[] array = md5.digest(); StringBuilder sb2 = new StringBuilder(); for (int j = 0; j < array.length; ++j) { int b = array[j] & 0xFF; sb2.append(Integer.toHexString(b)); } int begin = myRand.nextInt(); if (begin < 0) begin = begin * -1; begin = begin % 8; baseUUID = sb2.toString().substring(begin, begin + 18).toUpperCase(); } }