com.alexkasko.unsafe.offheaplong

Class LongPacker

java.lang.Object

com.alexkasko.unsafe.offheaplong.LongPacker

public class LongPacker
extends Object

Contains static methods for packing two values with limited size (one long and one int) into one long value. May be used to pack values before placing them into OffHeapLongAddressable. Values are stored using bit shifting as follows:

 0                             32        64-bits             64
  +-----------------------------+-----------+------------------+
  | first 32 bits of long value | int value | tail of long val |
  +-----------------------------+-----------+------------------+
 
 

This class doesn't use sun.misc.Unsafe

Author:

alexkasko Date: 1/14/13

Constructor Summary

Constructors

Constructor and Description
LongPacker()

Method Summary

Methods

Modifier and Type	Method and Description
static long	big(long pack, int bits) Read long value from packed long.
static int	little(long pack, int bits) Values limits are checking using assert keyword, java must be run with -ea switch to enable them.
static long	pack(long big, int little, int bits) Packs one long value with limited size and one int value into one long value.

Methods inherited from class java.lang.Object

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

Constructor Detail

LongPacker

public LongPacker()

Method Detail

pack

public static long pack(long big,
        int little,
        int bits)

Packs one long value with limited size and one int value into one long value. Values limits are checking using assert keyword, java must be run with -ea switch to enable them.

Parameters:

big - long value

little - int value

bits - max size of long value in bits, max size of int value is 64 - bits

Returns:

packed long value

big

public static long big(long pack,
       int bits)

Read long value from packed long. Values limits are checking using assert keyword, java must be run with -ea switch to enable them.

Parameters:

pack - packed long

bits - max size of long value in bits, max size of int value is 64 - bits

Returns:

source long value

little

public static int little(long pack,
         int bits)

Values limits are checking using assert keyword, java must be run with -ea switch to enable them.

Parameters:

pack - packed long

bits - max size of long value in bits, max size of int value is 64 - bits

Returns:

source int value