com.bigdata.util

Class Bits

java.lang.Object

com.bigdata.util.Bits

public class Bits
extends Object

Simple helper class to work with bits inside a byte. Useful for classes that have a lot of boolean properties or pointers to enums that can be more compactly represented as a series of bit flags. See SPO.

Author:

mikepersonick

Constructor Summary

Constructors

Constructor and Description
Bits()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	get(byte bits, int i) Get a bit from inside a byte.
static byte	mask(byte bits, int... m) Get a new byte, masking off all but the bits specified by m.
static byte	set(byte bits, int i, boolean bit) Set a bit inside a byte.
static String	toString(byte bits) Useful for debugging.

Methods inherited from class java.lang.Object

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

Constructor Detail

Bits

public Bits()

Method Detail

set

public static byte set(byte bits,
       int i,
       boolean bit)

Set a bit inside a byte.

Parameters:

bits - the original byte

i - the bit index (0 through 7)

bit - the bit value

Returns:

the new byte

get

public static boolean get(byte bits,
          int i)

Get a bit from inside a byte.

Parameters:

bits - the byte

i - the bit index (0 through 7)

Returns:

the bit value

mask

public static byte mask(byte bits,
        int... m)

Get a new byte, masking off all but the bits specified by m.

Parameters:

bits - the original byte

m - the bits to keep, all others will be masked

Returns:

the new byte

toString

public static String toString(byte bits)

Useful for debugging.

Parameters:

bits - the byte

Returns:

the unsigned binary string representation