com.twitter.distributedlog.util

Class BitMaskUtils

java.lang.Object

com.twitter.distributedlog.util.BitMaskUtils

public class BitMaskUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
BitMaskUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static long	get(long value, long mask) Get the bits where mask is 1
static long	set(long oldValue, long mask, long newValue) 1) Unset all bits where value in mask is set.

Methods inherited from class java.lang.Object

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

Constructor Detail

BitMaskUtils

public BitMaskUtils()

Method Detail

set

public static long set(long oldValue,
       long mask,
       long newValue)

1) Unset all bits where value in mask is set. 2) Set these bits to value specified by newValue. e.g. if oldValue = 1010, mask = 0011, newValue = 0001 1) 1010 -> 1000 2) 1000 -> 1001

Parameters:

oldValue - expected old value

mask - the mask of the value for updates

newValue - new value to set

Returns:

updated value

get

public static long get(long value,
       long mask)

Get the bits where mask is 1

Parameters:

value - value

mask - mask of the value

Returns:

the bit of the mask