Package nl.tue.storage.compressor

Class BitMask

java.lang.Object

nl.tue.storage.compressor.BitMask

All Implemented Interfaces:

java.lang.Cloneable

public class BitMask
extends java.lang.Object
implements java.lang.Cloneable

Constructor Summary

Constructors

Constructor	Description
BitMask(byte[] bytes, int numberOfBits)
BitMask(byte[] bytes, int ones, int numberOfBits)
BitMask(int numberOfBits)

Method Summary

Modifier and Type	Method	Description
BitMask	clone()
boolean	equals(java.lang.Object o)
byte[]	getBytes()
static int[]	getIndices(BitMask bitmask)	return the indices flagged by this bitmask
int	getNumBits()
static int	getNumBytes(int size)	returns the number of bytes in a bitmask for a list containing precisely size elements.
int	getOnes()
int	hashCode()	The hashcode of BitMask is defined as the hashcode of its bytes.
TBooleanIterator	iterator()
static BitMask	makeBitMask(int size, int... indices)	Flag the bits at the given indices
static BitMask	makeBitMask(int size, short... indices)	Flag the bits at the given indices
static BitMask	makeBitMask(int size, gnu.trove.set.TIntSet indices)	Flag the bits at the given indices
static BitMask	makeBitMask(int size, java.util.Collection<java.lang.Integer> indices)	Flag the bits at the given indices
void	set(int index, boolean value)
boolean[]	toBooleanArray()
java.lang.String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BitMask

public BitMask(byte[] bytes,
               int ones,
               int numberOfBits)

BitMask

public BitMask(byte[] bytes,
               int numberOfBits)

BitMask

public BitMask(int numberOfBits)

Method Detail

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

The hashcode of BitMask is defined as the hashcode of its bytes.

Overrides:

hashCode in class java.lang.Object

set

public void set(int index,
                boolean value)

getNumBytes

public static int getNumBytes(int size)

returns the number of bytes in a bitmask for a list containing precisely size elements.

Parameters:

size -

Returns:

makeBitMask

public static BitMask makeBitMask(int size,
                                  int... indices)

Flag the bits at the given indices

Parameters:

indices -

makeBitMask

public static BitMask makeBitMask(int size,
                                  short... indices)

Flag the bits at the given indices

Parameters:

indices -

makeBitMask

public static BitMask makeBitMask(int size,
                                  gnu.trove.set.TIntSet indices)

Flag the bits at the given indices

Parameters:

indices -

makeBitMask

public static BitMask makeBitMask(int size,
                                  java.util.Collection<java.lang.Integer> indices)

Flag the bits at the given indices

Parameters:

indices -

getIndices

public static int[] getIndices(BitMask bitmask)

return the indices flagged by this bitmask

Returns:

iterator

public TBooleanIterator iterator()

getOnes

public int getOnes()

getBytes

public byte[] getBytes()

getNumBits

public int getNumBits()

toBooleanArray

public boolean[] toBooleanArray()

clone

public BitMask clone()

Overrides:

clone in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object