org.apache.openjpa.lib.util
Class UUIDGenerator

java.lang.Object
  org.apache.openjpa.lib.util.UUIDGenerator

public class UUIDGenerator
extends Object

UUID value generator. Type 1 generator is based on the time-based generator in the Apache Commons Id project: http://jakarta.apache.org/commons/sandbox /id/uuid.html The type 4 generator uses the standard Java UUID generator. The type 1 code has been vastly simplified and modified to replace the ethernet address of the host machine with the IP, since we do not want to require native libs and Java cannot access the MAC address directly. In spirit, implements the IETF UUID draft specification, found here:
http://www1.ics.uci.edu/~ejw/authoring/uuid-guid/draft-leach-uuids-guids-01 .txt

Since:

0.3.3

Author:

Abe White, Kevin Sutter

Field Summary

static int	TYPE1
static int	TYPE4

Constructor Summary

UUIDGenerator()

Method Summary

static byte[]	createType1()
(package private) static long	getTime() Get the timestamp to be used for this uuid.
static byte[]	next(int type) Return a unique UUID value.
static String	nextHex(int type) Return the next unique uuid value as a 32-character hex string.
static String	nextString(int type) Return the next unique uuid value as a 16-character string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TYPE1

public static final int TYPE1

See Also:

Constant Field Values

TYPE4

public static final int TYPE4

See Also:

Constant Field Values

Constructor Detail

UUIDGenerator

public UUIDGenerator()

Method Detail

next

public static byte[] next(int type)

Return a unique UUID value.

createType1

public static byte[] createType1()

nextString

public static String nextString(int type)

Return the next unique uuid value as a 16-character string.

nextHex

public static String nextHex(int type)

Return the next unique uuid value as a 32-character hex string.

getTime

static long getTime()

Get the timestamp to be used for this uuid. Must be called from a synchronized block.

Returns:

long timestamp