org.apache.sysds.runtime.compress.bitmap

Class ABitmap

java.lang.Object

org.apache.sysds.runtime.compress.bitmap.ABitmap

Direct Known Subclasses:

Bitmap, MultiColBitmap

public abstract class ABitmap
extends Object

Method Summary

Modifier and Type	Method and Description
boolean	containsZero()
abstract int	getNumColumns()
abstract int	getNumNonZerosInOffset(int idx)
long	getNumOffsets()
int	getNumOffsets(int ix) Get the number of offsets for a specific unique offset.
abstract int	getNumValues() Obtain number of distinct value groups in the column.
int	getNumZeros()
IntArrayList[]	getOffsetList()
IntArrayList	getOffsetsList(int idx)
boolean	isEmpty()
abstract void	sortValuesByFrequency()
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

isEmpty

public final boolean isEmpty()

getOffsetList

public final IntArrayList[] getOffsetList()

getOffsetsList

public final IntArrayList getOffsetsList(int idx)

getNumOffsets

public final long getNumOffsets()

getNumOffsets

public final int getNumOffsets(int ix)

Get the number of offsets for a specific unique offset.

Parameters:

ix - The offset index.

Returns:

The number of offsets for this unique value.

getNumZeros

public final int getNumZeros()

containsZero

public final boolean containsZero()

getNumValues

public abstract int getNumValues()

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

Returns:

number of distinct value groups in the column;

sortValuesByFrequency

public abstract void sortValuesByFrequency()

getNumNonZerosInOffset

public abstract int getNumNonZerosInOffset(int idx)

getNumColumns

public abstract int getNumColumns()

toString

public String toString()

Overrides:

toString in class Object