com.iwombat.foundation.uuid

Class UUID

java.lang.Object

com.iwombat.foundation.uuid.UUID

All Implemented Interfaces:

Identifier, Serializable

public class UUID
extends Object
implements Identifier, Serializable

Universal object identifier.
16-byte Object identifier for use by all persistant objects based on DCE standard

• byte 00-03: low time comonent
• byte 04-05: mid time component
• byte 06-07: high time component and version
• byte 08: sequence number high byte and variant
• byte 09: sequence number low byte
• byte 10-15: MAC address - passed in from System property

Implementation notes: The DCE spec calls for MacAddress as part of the UUID algorythm. Since java supplies no mechanism for this ObjectId looks for a MACADDR system property consisting of a hex string of six bytes ( a 12 character hex string - no delimiters and no 0x token ). Failing to find said system property ObjectId generates a random MACADDR and uses the last octet of the ip address as the last octet in the MACADDR to guarantee unequeness on the same subnet. (If localhost is NOT 127.0.0.1)

Author:

bobc

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	UUID(byte[] value)
protected	UUID(String hexString)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Compares for equality.
byte[]	getValue()
int	hashCode() Supports the java obect hashCode - lamely.
protected void	setValue(byte[] newValue)
String	toHexString()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UUID

protected UUID(byte[] value)

UUID

protected UUID(String hexString)

Method Detail

getValue

public byte[] getValue()

Specified by:

getValue in interface Identifier

Returns:

the byte-array value for this identifier

See Also:

com.raf.foundation.Identifier#getValue()

setValue

protected void setValue(byte[] newValue)

Parameters:

newValue -

toHexString

public String toHexString()

Specified by:

toHexString in interface Identifier

Returns:

a hex-string representation of the byte value

See Also:

com.raf.foundation.Identifier#toHexString()

toString

public String toString()

Specified by:

toString in interface Identifier

Overrides:

toString in class Object

Returns:

human-readable String representation

equals

public boolean equals(Object obj)

Compares for equality.

Specified by:

equals in interface Identifier

Overrides:

equals in class Object

Parameters:

obj - The object to which this id should be compared.

Returns:

true if o is an ObjectId, and it's value equal.

hashCode

public int hashCode()

Supports the java obect hashCode - lamely.

Specified by:

hashCode in interface Identifier

Overrides:

hashCode in class Object

Returns:

hashcode.