Unique id generation

Question

Hi all,
I need to automatically generate a unique id for table rows.
CAF does not provide this feature and I'd rather not develop some custom table to be used as a counter.
Did anyone solve this problem before? Does the AS java provide some specific api for this purpose?
Thanks, regards
Vincenzo

Answer 1

Hi
Use the givn  code just call the method generateKey().
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.SecureRandom;
public class UUIDGenerator
     private UUIDGenerator()
     public static String generateKey()
          StringBuffer buffer = new StringBuffer(16);
          byte addr[] = null;
          try
               addr = InetAddress.getLocalHost().getAddress();
          catch (UnknownHostException e)
               System.out.println("Test");
               e.printStackTrace();
          buffer.append(toHex(toInt(addr), 8));
          buffer.append(toHex(System.identityHashCode(new UUIDGenerator()), 8));
          midValue = buffer.toString();
          seeder = new SecureRandom();
          StringBuffer timeBuffer = new StringBuffer(32);
          timeBuffer.append(toHex((int) (System.currentTimeMillis() & -1L), 8));
          timeBuffer.append(midValue);
          timeBuffer.append(toHex(seeder.nextInt(), 8));
          return timeBuffer.toString();
     private static String toHex(int value, int length)
          char hexDigits[] =
          { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'G', 'F' };
          StringBuffer buffer = new StringBuffer(length);
          int shift = length - 1 << 2;
          for (int i = -1; ++i < length;)
               buffer.append(hexDigits[value >> shift & 0xf]);
               value <<= 4;
          return buffer.toString();
     private static int toInt(byte bytes[])
          int value = 0;
          for (int i = -1; ++i < bytes.length;)
               value <<= 8;
               int b = bytes<i> & 0xff;
               value |= b;
          return value;
     private static SecureRandom seeder;
     private static String midValue;
Best Regards
Satish Kumar