/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jcr.util;
import java.net.InetAddress;
import java.security.SecureRandom;
/**
* Created by The eXo Platform SAS 10.07.2007
*
* Standalone IDGenerator. For testing purpose. Logic wrapped from IdGenerator/IdGeneratorService
*
* @author <a href="mailto:peter.nedonosko@exoplatform.com.ua">Peter Nedonosko</a>
* @version $Id: SIDGenerator.java 11907 2008-03-13 15:36:21Z ksm $
*/
public class SIDGenerator
{
private static String hexServerIP_ = null;
private static final SecureRandom seeder_ = new SecureRandom();
static
{
try
{
// get the inet address
InetAddress localInetAddress = InetAddress.getLocalHost();
byte serverIP[] = localInetAddress.getAddress();
hexServerIP_ = hexFormat(getInt(serverIP), 8);
}
catch (java.net.UnknownHostException uhe)
{
uhe.printStackTrace();
hexServerIP_ = null;
}
}
public static String generate()
{
return generateStringID("" + System.currentTimeMillis());
}
public static long generateLongID(Object o)
{
String uuid = generateStringID(o);
return uuid.hashCode();
}
public static int generatIntegerID(Object o)
{
String uuid = generateStringID(o);
return uuid.hashCode();
}
public static String generateStringID(Object o)
{
StringBuffer tmpBuffer = new StringBuffer(16);
String hashcode = hexFormat(System.identityHashCode(o), 8);
tmpBuffer.append(hexServerIP_);
tmpBuffer.append(hashcode);
long timeNow = System.currentTimeMillis();
int timeLow = (int)timeNow & 0xFFFFFFFF;
int node = seeder_.nextInt();
StringBuffer guid = new StringBuffer(32);
guid.append(hexFormat(timeLow, 8));
guid.append(tmpBuffer.toString());
guid.append(hexFormat(node, 8));
return guid.toString();
}
private static int getInt(byte bytes[])
{
int i = 0;
int j = 24;
for (int k = 0; j >= 0; k++)
{
int l = bytes[k] & 0xff;
i += l << j;
j -= 8;
}
return i;
}
private static String hexFormat(int i, int j)
{
String s = Integer.toHexString(i);
return padHex(s, j) + s;
}
private static String padHex(String s, int i)
{
StringBuffer tmpBuffer = new StringBuffer();
if (s.length() < i)
{
for (int j = 0; j < i - s.length(); j++)
{
tmpBuffer.append('0');
}
}
return tmpBuffer.toString();
}
}