be.SIRAPRISE.util

Class MyUniqueID

java.lang.Object

be.SIRAPRISE.util.MyUniqueID

public abstract class MyUniqueID
extends java.lang.Object

Author:

Erwin

Field Summary

Fields

Modifier and Type	Field and Description
static int	_DEFAULTHASHMOD The hash modulo number (58881877 )
static long	HASHBITCOUNT The bit count needed for registering a hash value
static long	HASHSCALEMASK The hash mask
static long	TIMEBITCOUNT The bit count needed for registering the time portion : 64 available, minus 8 for the sequence, minus one for any indicator we might ever want, minus the hash portion.
static long	TIMESCALEMASK The time mask

Method Summary

Modifier and Type	Method and Description
static long	getSeq() Gets a sequence
static long	getUniqueID(java.nio.ByteBuffer byteBuffer) Gets a unique internal id
static int	hash(java.nio.ByteBuffer byteBuffer, int hashMod) Method to calculate a hash number.

Methods inherited from class java.lang.Object

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

Field Detail

_DEFAULTHASHMOD

public static final int _DEFAULTHASHMOD

The hash modulo number (58881877 )

See Also:

Constant Field Values

HASHBITCOUNT

public static final long HASHBITCOUNT

The bit count needed for registering a hash value

HASHSCALEMASK

public static final long HASHSCALEMASK

The hash mask

TIMEBITCOUNT

public static final long TIMEBITCOUNT

The bit count needed for registering the time portion : 64 available, minus 8 for the sequence, minus one for any indicator we might ever want, minus the hash portion.

TIMESCALEMASK

public static final long TIMESCALEMASK

The time mask

Method Detail

getSeq

public static long getSeq()

Gets a sequence

Returns:

a sequence trick (yeuk)

getUniqueID

public static long getUniqueID(java.nio.ByteBuffer byteBuffer)

Gets a unique internal id

Parameters:

byteBuffer - the byte buffer representing the value for which a unique id is to be obtained

Returns:

an ID that is as unique as possible

hash

public static int hash(java.nio.ByteBuffer byteBuffer,
                       int hashMod)

Method to calculate a hash number.

Parameters:

byteBuffer - a ByteBuffer object holding the internal representation of the data to be hashed.

hashMod - -

Returns:

an integer hash value.