/*
* Created on 28-Mar-2006
* Created by Paul Gardner
* Copyright (C) 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.aelitis.azureus.core.util;
import java.security.SecureRandom;
import java.util.Random;
import org.gudy.azureus2.core3.internat.MessageText;
import org.gudy.azureus2.core3.util.ByteFormatter;
import org.gudy.azureus2.core3.util.RandomUtils;
public class
UUIDGenerator
{
/**
* 128 bit UUID using random method
* @return
*/
public static synchronized byte[]
generateUUID()
{
byte[] bytes = new byte[16];
RandomUtils.SECURE_RANDOM.nextBytes( bytes );
return( bytes );
}
/**
* 129 byte random UUID formatted as standard 36 char hex and hyphen string
* @return
*/
public static String
generateUUIDString()
{
byte[] bytes = generateUUID();
String res = ByteFormatter.encodeString( bytes ).toLowerCase( MessageText.LOCALE_ENGLISH );
return( res.substring(0,8) + "-" + res.substring(8,12) +
"-" + res.substring(12,16) + "-" + res.substring(16,20) + "-" + res.substring( 20 ));
}
public static void
main(
String[] args )
{
for (int i=0;i<100;i++){
System.out.println( generateUUIDString());
}
}
}