org.h2.dev.hash
Class IntPerfectHash.BitArray

java.lang.Object
  org.h2.dev.hash.IntPerfectHash.BitArray

Enclosing class:

IntPerfectHash

public static class IntPerfectHash.BitArray
extends java.lang.Object

A helper class for bit arrays.

Constructor Summary

IntPerfectHash.BitArray()

Method Summary

static int	countBits(byte[] data) Count the number of set bits.
static boolean	getBit(byte[] data, int x) Get a bit in a bit array.
static byte[]	setBit(byte[] data, int x, boolean value) Set a bit in the array.

Methods inherited from class java.lang.Object

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

Constructor Detail

IntPerfectHash.BitArray

public IntPerfectHash.BitArray()

Method Detail

setBit

public static byte[] setBit(byte[] data,
                            int x,
                            boolean value)

Set a bit in the array.

Parameters:

data - the array

x - the bit index

value - the new value

Returns:

the bit array (if the passed one was too small)

getBit

public static boolean getBit(byte[] data,
                             int x)

Get a bit in a bit array.

Parameters:

data - the array

x - the bit index

Returns:

the value

countBits

public static int countBits(byte[] data)

Count the number of set bits.

Parameters:

data - the array

Returns:

the number of set bits