IntPerfectHash.BitArray

java.lang.Object

org.h2.dev.hash.IntPerfectHash.BitArray

Enclosing class:: IntPerfectHash

public static class IntPerfectHash.BitArray extends Object

A helper class for bit arrays.

Constructor Summary

Constructors

Constructor

Description

BitArray()
Method Summary

Modifier and Type

Method

Description

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 Details
- BitArray
  
  public BitArray()
Method Details
- 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