com.sun.xml.registry.ebxml.util
Class UUID

java.lang.Object
  extended bycom.sun.xml.registry.ebxml.util.UUID
All Implemented Interfaces:
java.io.Serializable

public final class UUID
extends java.lang.Object
implements java.io.Serializable

A universally unique identifier (UUID). A UUID is a 128-bit value.

The most significant long can be decomposed into the following unsigned fields:

 0xFFFFFFFF00000000 time_low
 0x00000000FFFF0000 time_mid
 0x000000000000F000 version
 0x0000000000000FFF time_hi
 
The least significant long can be decomposed into the following unsigned fields:
 0xC000000000000000 variant
 0x3FFF000000000000 clock_seq
 0x0000FFFFFFFFFFFF node
 
The variant field must be 0x2. The version field must be either 0x1 or 0x4. If the version field is 0x4, then the most significant bit of the node field must be set to 1, and the remaining fields are set to values produced by a cryptographically strong pseudo-random number generator. If the version field is 0x1, then the node field is set to an IEEE 802 address, the clock_seq field is set to a 14-bit random number, and the time_low, time_mid, and time_hi fields are set to the least, middle and most significant bits (respectively) of a 60-bit timestamp measured in 100-nanosecond units since midnight, October 15, 1582 UTC.

See Also:
Serialized Form

Constructor Summary
UUID(java.io.DataInput in)
          Reads in 16 bytes in standard network byte order.
UUID(long mostSig, long leastSig)
          Simple constructor.
 
Method Summary
 boolean equals(java.lang.Object obj)
          UU IDs are equal if they represent the same 128-bit value.
 long getLeastSignificantBits()
          Returns the least significant 64 bits of the service ID.
 long getMostSignificantBits()
          Returns the most significant 64 bits of the service ID.
 int hashCode()
           
 java.lang.String toString()
          Returns a 36-character string of six fields separated by hyphens, with each field represented in lowercase hexadecimal with the same number of digits as in the field.
 void writeBytes(java.io.DataOutput out)
          Writes out 16 bytes in standard network byte order.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

UUID

public UUID(long mostSig,
            long leastSig)
Simple constructor.

Parameters:
mostSig - the most significant 64 bits
leastSig - the lease significant 64 bits

UUID

public UUID(java.io.DataInput in)
     throws java.io.IOException
Reads in 16 bytes in standard network byte order.

Parameters:
in - the input stream to read 16 bytes from
Method Detail

getMostSignificantBits

public long getMostSignificantBits()
Returns the most significant 64 bits of the service ID.


getLeastSignificantBits

public long getLeastSignificantBits()
Returns the least significant 64 bits of the service ID.


writeBytes

public void writeBytes(java.io.DataOutput out)
                throws java.io.IOException
Writes out 16 bytes in standard network byte order.

Parameters:
out - the output stream to write 16 bytes to
Throws:
java.io.IOException

hashCode

public int hashCode()

equals

public boolean equals(java.lang.Object obj)
UU IDs are equal if they represent the same 128-bit value.


toString

public java.lang.String toString()
Returns a 36-character string of six fields separated by hyphens, with each field represented in lowercase hexadecimal with the same number of digits as in the field. The order of fields is: time_low, time_mid, version and time_hi treated as a single field, variant and clock_seq treated as a single field, and node.



Copyright © 2001-2004 OASIS. All Rights Reserved.