com.googlecode.javaewah32

Class IteratorAggregation32

java.lang.Object

com.googlecode.javaewah32.IteratorAggregation32

public final class IteratorAggregation32
extends Object

Set of helper functions to aggregate bitmaps.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_MAX_BUF_SIZE An optimization option.

Method Summary

Modifier and Type	Method and Description
static IteratingRLW32	bufferedand(int bufSize, IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
static IteratingRLW32	bufferedand(IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
static IteratingRLW32	bufferedor(int bufSize, IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
static IteratingRLW32	bufferedor(IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
static IteratingRLW32	bufferedxor(int bufSize, IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
static IteratingRLW32	bufferedxor(IteratingRLW32... al) Aggregate the iterators using a bitmap buffer.
protected static int	discharge(BitmapStorage32 container, IteratingRLW32 i, int max) Write out up to max words, returns how many were written
protected static void	dischargeAsEmpty(BitmapStorage32 container, IteratingRLW32 i) Write out the content of the iterator, but as if it were all zeros.
protected static int	dischargeNegated(BitmapStorage32 container, IteratingRLW32 i, int max) Write out up to max negated words, returns how many were written
protected static int	inplaceand(int[] bitmap, IteratingRLW32 i)
protected static int	inplaceor(int[] bitmap, IteratingRLW32 i)
protected static int	inplacexor(int[] bitmap, IteratingRLW32 i)
static IteratingRLW32	not(IteratingRLW32 x)
static void	xorToContainer(BitmapStorage32 container, int desiredrlwcount, IteratingRLW32 rlwi, IteratingRLW32 rlwj) Compute the first few words of the XOR aggregate between two iterators.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAX_BUF_SIZE

public static final int DEFAULT_MAX_BUF_SIZE

An optimization option. Larger values may improve speed, but at the expense of memory.

See Also:

Constant Field Values

Method Detail

not

public static IteratingRLW32 not(IteratingRLW32 x)

Parameters:

x - iterator to negate

Returns:

negated version of the iterator

bufferedand

public static IteratingRLW32 bufferedand(IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

Returns:

and aggregate

bufferedand

public static IteratingRLW32 bufferedand(int bufSize,
                                         IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

bufSize - size of the internal buffer used by the iterator in 64-bit words

Returns:

and aggregate

bufferedor

public static IteratingRLW32 bufferedor(IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

Returns:

or aggregate

bufferedor

public static IteratingRLW32 bufferedor(int bufSize,
                                        IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

bufSize - size of the internal buffer used by the iterator in 64-bit words

Returns:

or aggregate

bufferedxor

public static IteratingRLW32 bufferedxor(IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

Returns:

xor aggregate

bufferedxor

public static IteratingRLW32 bufferedxor(int bufSize,
                                         IteratingRLW32... al)

Aggregate the iterators using a bitmap buffer.

Parameters:

al - iterators to aggregate

bufSize - size of the internal buffer used by the iterator in 64-bit words

Returns:

xor aggregate

dischargeAsEmpty

protected static void dischargeAsEmpty(BitmapStorage32 container,
                                       IteratingRLW32 i)

Write out the content of the iterator, but as if it were all zeros.

Parameters:

container - where we write

i - the iterator

discharge

protected static int discharge(BitmapStorage32 container,
                               IteratingRLW32 i,
                               int max)

Write out up to max words, returns how many were written

Parameters:

container - target for writes

i - source of data

max - maximal number of writes

Returns:

how many written

dischargeNegated

protected static int dischargeNegated(BitmapStorage32 container,
                                      IteratingRLW32 i,
                                      int max)

Write out up to max negated words, returns how many were written

Parameters:

container - target for writes

i - source of data

max - maximal number of writes

Returns:

how many written

xorToContainer

public static void xorToContainer(BitmapStorage32 container,
                                  int desiredrlwcount,
                                  IteratingRLW32 rlwi,
                                  IteratingRLW32 rlwj)

Compute the first few words of the XOR aggregate between two iterators.

Parameters:

container - where to write

desiredrlwcount - number of words to be written (max)

rlwi - first iterator to aggregate

rlwj - second iterator to aggregate

inplaceor

protected static int inplaceor(int[] bitmap,
                               IteratingRLW32 i)

inplacexor

protected static int inplacexor(int[] bitmap,
                                IteratingRLW32 i)

inplaceand

protected static int inplaceand(int[] bitmap,
                                IteratingRLW32 i)