org.h2.util

Class BitField

java.lang.Object

org.h2.util.BitField

public final class BitField
extends java.lang.Object

A list of bits.

Constructor Summary

Constructors

Constructor and Description
BitField()
BitField(int capacity)

Method Summary

Modifier and Type	Method and Description
void	clear(int i) Set bit at the given index to 'false'.
boolean	get(int i) Get the bit at the given index.
int	getByte(int i) Get the next 8 bits at the given index.
int	length() Get the index of the highest set bit plus one, or 0 if no bits are set.
int	nextClearBit(int fromIndex) Get the index of the next bit that is not set.
void	set(int i) Set bit at the given index to 'true'.
void	set(int fromIndex, int toIndex, boolean value) Enable or disable a number of bits.
void	setByte(int i, int x) Combine the next 8 bits at the given index with OR.

Methods inherited from class java.lang.Object

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

Constructor Detail

BitField

public BitField()

BitField

public BitField(int capacity)

Method Detail

nextClearBit

public int nextClearBit(int fromIndex)

Get the index of the next bit that is not set.

Parameters:

fromIndex - where to start searching

Returns:

the index of the next disabled bit

get

public boolean get(int i)

Get the bit at the given index.

Parameters:

i - the index

Returns:

true if the bit is enabled

getByte

public int getByte(int i)

Get the next 8 bits at the given index. The index must be a multiple of 8.

Parameters:

i - the index

Returns:

the next 8 bits

setByte

public void setByte(int i,
                    int x)

Combine the next 8 bits at the given index with OR. The index must be a multiple of 8.

Parameters:

i - the index

x - the next 8 bits (0 - 255)

set

public void set(int i)

Set bit at the given index to 'true'.

Parameters:

i - the index

clear

public void clear(int i)

Set bit at the given index to 'false'.

Parameters:

i - the index

set

public void set(int fromIndex,
                int toIndex,
                boolean value)

Enable or disable a number of bits.

Parameters:

fromIndex - the index of the first bit to enable or disable

toIndex - one plus the index of the last bit to enable or disable

value - the new value

length

public int length()

Get the index of the highest set bit plus one, or 0 if no bits are set.

Returns:

the length of the bit field