com.googlecode.javaewah

Class BitCounter

java.lang.Object

com.googlecode.javaewah.BitCounter

All Implemented Interfaces:

BitmapStorage

public final class BitCounter
extends Object
implements BitmapStorage

BitCounter is a fake bitset data structure. Instead of storing the actual data, it only records the number of set bits.

Since:

0.4.0

Author:

David McIntosh

Constructor Summary

Constructors

Constructor and Description
BitCounter()

Method Summary

Modifier and Type	Method and Description
void	addLiteralWord(long newData) Virtually add literal words directly to the bitmap
void	addStreamOfEmptyWords(boolean v, long number) virtually add many zeroes or ones.
void	addStreamOfLiteralWords(com.googlecode.javaewah.Buffer buffer, int start, int number) virtually add several literal words.
void	addStreamOfNegatedLiteralWords(com.googlecode.javaewah.Buffer buffer, int start, int number) virtually add several negated literal words.
void	addWord(long newData) Virtually add words directly to the bitmap
void	clear() Empties the container.
int	getCount() As you act on this class, it records the number of set (true) bits.
void	setSizeInBitsWithinLastWord(int bits) should directly set the sizeInBits field, but is effectively ignored in this class.

Methods inherited from class java.lang.Object

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

Constructor Detail

BitCounter

public BitCounter()

Method Detail

addWord

public void addWord(long newData)

Virtually add words directly to the bitmap

Specified by:

addWord in interface BitmapStorage

Parameters:

newData - the word

addLiteralWord

public void addLiteralWord(long newData)

Virtually add literal words directly to the bitmap

Specified by:

addLiteralWord in interface BitmapStorage

Parameters:

newData - the word

addStreamOfLiteralWords

public void addStreamOfLiteralWords(com.googlecode.javaewah.Buffer buffer,
                                    int start,
                                    int number)

virtually add several literal words.

Specified by:

addStreamOfLiteralWords in interface BitmapStorage

Parameters:

buffer - the buffer wrapping the literal words

start - the starting point in the array

number - the number of literal words to add

addStreamOfEmptyWords

public void addStreamOfEmptyWords(boolean v,
                                  long number)

virtually add many zeroes or ones.

Specified by:

addStreamOfEmptyWords in interface BitmapStorage

Parameters:

v - zeros or ones

number - how many to words add

addStreamOfNegatedLiteralWords

public void addStreamOfNegatedLiteralWords(com.googlecode.javaewah.Buffer buffer,
                                           int start,
                                           int number)

virtually add several negated literal words.

Specified by:

addStreamOfNegatedLiteralWords in interface BitmapStorage

Parameters:

buffer - the buffer wrapping the literal words

start - the starting point in the array

number - the number of literal words to add

clear

public void clear()

Description copied from interface: BitmapStorage

Empties the container.

Specified by:

clear in interface BitmapStorage

getCount

public int getCount()

As you act on this class, it records the number of set (true) bits.

Returns:

number of set bits

setSizeInBitsWithinLastWord

public void setSizeInBitsWithinLastWord(int bits)

should directly set the sizeInBits field, but is effectively ignored in this class.

Specified by:

setSizeInBitsWithinLastWord in interface BitmapStorage

Parameters:

bits - number of bits