public static String generate() { return new StringBuilder(32).append(format(getIP())).append( format(getJVM())).append(format(getHiTime())).append( format(getLoTime())).append(format(getCount())).toString();
}
private static final int IP; static { int ipadd; try { ipadd = toInt(InetAddress.getLocalHost().getAddress()); } catch (Exception e) { ipadd = 0; } IP = ipadd; }
private static short counter = (short) 0;
private static final int JVM = (int) (System.currentTimeMillis() >>> 8);
private final static short getCount() { synchronized (UUIDGenerator.class) { if (counter < 0) counter = 0; return counter++; } }
/** * Unique in a local network */ private final static int getIP() { return IP; }
/** * Unique down to millisecond */ private final static short getHiTime() { return (short) (System.currentTimeMillis() >>> 32); }
private final static int getLoTime() { return (int) System.currentTimeMillis(); }
private final static int toInt(byte[] bytes) { int result = 0; for (int i = 0; i < 4; i++) { result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i]; } return result; }