com.googlecode.javaewah32

Class IteratorUtil32

java.lang.Object

com.googlecode.javaewah32.IteratorUtil32

public final class IteratorUtil32
extends java.lang.Object

Convenience functions for working over iterators

Constructor Summary

Constructors

Modifier	Constructor and Description
private	IteratorUtil32() Private constructor to prevent instantiation

Method Summary

Modifier and Type	Method and Description
static int	cardinality(IteratingRLW32 i)
static EWAHCompressedBitmap32	materialize(IteratingRLW32 i) Turn an iterator into a bitmap This can be used to effectively clone a bitmap in the following manner: EWAHCompressedBitmap32 n = IteratorUtil32.materialize(bitmap.getIteratingRLW())); n.setSizeInBitsWithinLastWord(bitmap.sizeInBits());
static void	materialize(IteratingRLW32 i, BitmapStorage32 c) Turn an iterator into a bitmap
static long	materialize(IteratingRLW32 i, BitmapStorage32 c, int max) Turn an iterator into a bitmap
static IteratingRLW32[]	toIterators(EWAHCompressedBitmap32... x)
static IntIterator	toSetBitsIntIterator(IteratingRLW32 i)
static java.util.Iterator<java.lang.Integer>	toSetBitsIterator(IteratingRLW32 i)

Methods inherited from class java.lang.Object

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

Constructor Detail

IteratorUtil32

private IteratorUtil32()

Private constructor to prevent instantiation

Method Detail

toSetBitsIntIterator

public static IntIterator toSetBitsIntIterator(IteratingRLW32 i)

Parameters:

i - iterator we wish to iterate over

Returns:

an iterator over the set bits corresponding to the iterator

toSetBitsIterator

public static java.util.Iterator<java.lang.Integer> toSetBitsIterator(IteratingRLW32 i)

Parameters:

i - iterator we wish to iterate over

Returns:

an iterator over the set bits corresponding to the iterator

materialize

public static void materialize(IteratingRLW32 i,
                               BitmapStorage32 c)

Turn an iterator into a bitmap

Parameters:

i - iterator we wish to materialize

c - where we write

cardinality

public static int cardinality(IteratingRLW32 i)

Parameters:

i - iterator we wish to iterate over

Returns:

the cardinality (number of set bits) corresponding to the iterator

toIterators

public static IteratingRLW32[] toIterators(EWAHCompressedBitmap32... x)

Parameters:

x - set of bitmaps we wish to iterate over

Returns:

an array of iterators corresponding to the array of bitmaps

materialize

public static long materialize(IteratingRLW32 i,
                               BitmapStorage32 c,
                               int max)

Turn an iterator into a bitmap

Parameters:

i - iterator we wish to materialize

c - where we write

max - maximum number of words to materialize

Returns:

how many words were actually materialized

materialize

public static EWAHCompressedBitmap32 materialize(IteratingRLW32 i)

Turn an iterator into a bitmap This can be used to effectively clone a bitmap in the following manner: EWAHCompressedBitmap32 n = IteratorUtil32.materialize(bitmap.getIteratingRLW())); n.setSizeInBitsWithinLastWord(bitmap.sizeInBits());

Parameters:

i - iterator we wish to materialize

Returns:

materialized version of the iterator