org.cobraparser.util.ID Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of Cobra Show documentation
Show all versions of Cobra Show documentation
Cobra is the rendering engine designed for LoboBrowser
/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
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 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: [email protected]
*/
/*
* Created on Jun 7, 2005
*/
package org.cobraparser.util;
import java.math.BigInteger;
import java.net.InetAddress;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author J. H. S.
*/
public class ID {
private static final Random RANDOM1;
private static final Random RANDOM2;
private static final Random RANDOM3;
// Disabling. Don't like the feel of this:
// private static final long globalProcessID;
private static final Logger logger = Logger.getLogger(ID.class.getName());
static {
final long time = System.currentTimeMillis();
final long nanoTime = System.nanoTime();
final long freeMemory = Runtime.getRuntime().freeMemory();
long addressHashCode;
try {
InetAddress inetAddress;
inetAddress = InetAddress.getLoopbackAddress();
// inetAddress = InetAddress.getLocalHost();
addressHashCode = inetAddress.getHostName().hashCode() ^ inetAddress.getHostAddress().hashCode();
} catch (final Exception err) {
logger.log(Level.WARNING, "Unable to get local host information.", err);
addressHashCode = ID.class.hashCode();
}
// globalProcessID = time ^ nanoTime ^ freeMemory ^ addressHashCode;
RANDOM1 = new Random(time);
RANDOM2 = new Random(nanoTime);
RANDOM3 = new Random(addressHashCode ^ freeMemory);
}
private ID() {
}
public static long generateLong() {
return Math.abs(RANDOM1.nextLong() ^ RANDOM2.nextLong() ^ RANDOM3.nextLong());
}
public static int generateInt() {
return (int) generateLong();
}
public static byte[] getMD5Bytes(final String content) {
try {
final MessageDigest digest = MessageDigest.getInstance("MD5");
return digest.digest(content.getBytes("UTF-8"));
} catch (final NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
} catch (final java.io.UnsupportedEncodingException uee) {
throw new IllegalStateException(uee);
}
}
public static String getHexString(final byte[] bytes) {
// This method cannot change even if it's wrong.
BigInteger bigInteger = BigInteger.ZERO;
int shift = 0;
for (int i = bytes.length; --i >= 0;) {
BigInteger contrib = BigInteger.valueOf(bytes[i] & 0xFF);
contrib = contrib.shiftLeft(shift);
bigInteger = bigInteger.add(contrib);
shift += 8;
}
return bigInteger.toString(16).toUpperCase();
}
/**
* Gets a process ID that is nearly guaranteed to be globally unique.
*/
/*
public static long getGlobalProcessID() {
return globalProcessID;
}
*/
public static int random(final int min, final int max) {
if (max <= min) {
return min;
}
return (Math.abs(RANDOM1.nextInt()) % (max - min)) + min;
}
}