Show GUID.java syntax highlighted
package fr.loria.ecoo.util;
import java.net.InetAddress;
public class GUID {
private static String hexServerIP = null;
private static final java.security.SecureRandom seeder = new java.security.SecureRandom();
public static void main(String[] args) {
System.out.println(GUID.generateGUID(new String("tagada")));
}
/**
* A 32 byte GUID generator (Globally Unique ID).
*/
public static final String generateGUID(Object o) {
StringBuffer tmpBuffer = new StringBuffer(16);
if (hexServerIP == null) {
InetAddress localInetAddress = null;
byte serverIP[] = new byte[] { 127, 0, 0, 1 };
try {
// get the inet address
localInetAddress = InetAddress.getLocalHost();
serverIP = localInetAddress.getAddress();
} catch (java.net.UnknownHostException uhe) {
//
}
hexServerIP = hexFormat(getInt(serverIP), 8);
}
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();
}
}
See more files for this project here