javaewah
Class BitCounter

java.lang.Object
  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

BitCounter()

Method Summary

int	add(long newdata) Virtually add words directly to the bitmap
long	addStreamOfDirtyWords(long[] data, long start, long number) virtually add several dirty words.
int	addStreamOfEmptyWords(boolean v, long number) virtually add many zeroes or ones.
long	addStreamOfNegatedDirtyWords(long[] data, long start, long number) virtually add several negated dirty words.
int	getCount() As you act on this class, it records the number of set (true) bits.
void	setSizeInBits(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

add

public int add(long newdata)

Virtually add words directly to the bitmap

Specified by:

add in interface BitmapStorage

Parameters:

newdata - the word

Returns:

the number of words added to the buffer

addStreamOfEmptyWords

public int 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

Returns:

the number of words added to the buffer

addStreamOfDirtyWords

public long addStreamOfDirtyWords(long[] data,
                                  long start,
                                  long number)

virtually add several dirty words.

Specified by:

addStreamOfDirtyWords in interface BitmapStorage

Parameters:

data - the dirty words

start - the starting point in the array

number - the number of dirty words to add

Returns:

how many (compressed) words were added to the bitmap

addStreamOfNegatedDirtyWords

public long addStreamOfNegatedDirtyWords(long[] data,
                                         long start,
                                         long number)

virtually add several negated dirty words.

Specified by:

addStreamOfNegatedDirtyWords in interface BitmapStorage

Parameters:

data - the dirty words

start - the starting point in the array

number - the number of dirty words to add

Returns:

how many (compressed) words were added to the bitmap

setSizeInBits

public void setSizeInBits(int bits)

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

Specified by:

setSizeInBits in interface BitmapStorage

Parameters:

bits - number of bits

getCount

public int getCount()

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

Returns:

number of set bits