/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o 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, see http://www.gnu.org/licenses/. */
package com.db4o.foundation;
import java.net.*;
import java.util.*;
/**
* @exclude
* @sharpen.ignore
*/
public class JdkSignatureGenerator {
private static final Random _random = new Random();
private static int _counter;
public static String generateSignature() {
StringBuffer sb = new StringBuffer();
try {
String hostName = java.net.InetAddress.getLocalHost().getHostName() + "_";
if(hostName.length() > 15){
hostName = hostName.substring(0,15);
}
sb.append(hostName);
} catch (UnknownHostException e) {
}
sb.append(Long.toHexString(System.currentTimeMillis()));
sb.append(Integer.toHexString(_counter++));
int hostAddress = 0;
byte[] addressBytes;
try {
addressBytes = java.net.InetAddress.getLocalHost().getAddress();
for (int i = 0; i < addressBytes.length; i++) {
hostAddress <<= 4;
hostAddress -= addressBytes[i];
}
} catch (UnknownHostException e) {
}
sb.append(Integer.toHexString(hostAddress));
for (int i = 0; i < 4; i++) {
sb.append(Integer.toHexString(randomInt()));
}
return sb.toString().substring(0, 31);
}
private static int randomInt() {
return _random.nextInt();
}
}