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java.lang.Objectnet.jxta.impl.id.UUID.UUID
A UUID
is a 128-bit universally unique identifier.
The most significant long can be decomposed into the following
unsigned fields:
0xFFFFFFFF00000000 time_low 0x00000000FFFF0000 time_mid 0x000000000000F000 version 0x0000000000000FFF time_hiThe least significant long can be decomposed into the following unsigned fields:
0xC000000000000000 variant 0x3FFF000000000000 clock_seq 0x0000FFFFFFFFFFFF nodeThe 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 (MAC), 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.
IDFormat
,
UUIDFactory
,
"Information Technology - Open Systems Interconnection - Remote Procedure Call (RPC), ISO 11578:1996",
The Open Group - DCE 1.1 Remote Procedure Call (RPC) : Appendix A - Universal Unique Identifier,
Serialized FormField Summary | |
static UUID |
nullUUID
The null UUID. |
Constructor Summary | |
UUID(byte[] bytes)
Simple constructor. |
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UUID(long mostSig,
long leastSig)
Simple constructor. |
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UUID(String uuid)
|
Method Summary | |
boolean |
equals(Object target)
|
boolean |
equals(UUID sid)
UUIDs are equal if they represent the same 128-bit value. |
long |
getLeastSignificantBits()
Returns the least significant 64 bits of the UUID. |
long |
getMostSignificantBits()
Returns the most significant 64 bits of the UUID. |
int |
hashCode()
|
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. |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
public static final UUID nullUUID
Constructor Detail |
public UUID(long mostSig, long leastSig)
mostSig
- the most significant 64 bitsleastSig
- the lease significant 64 bitspublic UUID(byte[] bytes)
bytes
- the 128 bits ofpublic UUID(String uuid)
Method Detail |
public long getMostSignificantBits()
public long getLeastSignificantBits()
public int hashCode()
public boolean equals(Object target)
public boolean equals(UUID sid)
sid
- UUID seed
public String toString()
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JXTA J2SE | ||||||||||
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