org.apache.sysds.runtime.compress.utils

Class Bitmap

java.lang.Object

org.apache.sysds.runtime.compress.utils.ABitmap

org.apache.sysds.runtime.compress.utils.Bitmap

public final class Bitmap
extends ABitmap

Uncompressed representation of one or more columns in bitmap format.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.utils.ABitmap

ABitmap.BitmapType

Constructor Summary

Constructors

Constructor and Description
Bitmap(int numCols, IntArrayList[] offsetsLists, int numZeroGroups, double[] values)

Method Summary

Modifier and Type	Method and Description
int	getNumValues() Obtain number of distinct value groups in the column.
ABitmap.BitmapType	getType()
double[]	getValues() Get all values without unnecessary allocations and copies.
double[]	getValues(int ix) Obtain tuple of column values associated with index.
void	sortValuesByFrequency()
String	toString()

Methods inherited from class org.apache.sysds.runtime.compress.utils.ABitmap

containsZero, getNumColumns, getNumOffsets, getNumOffsets, getOffsetList, getOffsetsList, getZeroCounts

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Bitmap

public Bitmap(int numCols,
              IntArrayList[] offsetsLists,
              int numZeroGroups,
              double[] values)

Method Detail

getValues

public double[] getValues()

Get all values without unnecessary allocations and copies.

Returns:

dictionary of value tuples

getValues

public double[] getValues(int ix)

Obtain tuple of column values associated with index.

Parameters:

ix - index of a particular distinct value

Returns:

the tuple of column values associated with the specified index

getNumValues

public int getNumValues()

Description copied from class: ABitmap

Obtain number of distinct value groups in the column. this number is also the number of bitmaps, since there is one bitmap per value

Specified by:

getNumValues in class ABitmap

Returns:

number of distinct value groups in the column;

sortValuesByFrequency

public void sortValuesByFrequency()

Specified by:

sortValuesByFrequency in class ABitmap

toString

public String toString()

Overrides:

toString in class ABitmap

getType

public ABitmap.BitmapType getType()

Specified by:

getType in class ABitmap