org.apache.sysml.runtime.compress

Class UncompressedBitmap

java.lang.Object

org.apache.sysml.runtime.compress.UncompressedBitmap

public final class UncompressedBitmap
extends Object

Uncompressed representation of one or more columns in bitmap format.

Constructor Summary

Constructors

Constructor and Description
UncompressedBitmap(DblArrayIntListHashMap distinctVals, int numColumns)
UncompressedBitmap(DoubleIntListHashMap distinctVals)

Method Summary

Modifier and Type	Method and Description
int	getNumColumns()
int	getNumOffsets()
int	getNumValues() Obtain number of distinct values in the column.
int[]	getOffsetsList(int ix) Obtain array of offsets of the rows containing index value
double[]	getValues(int ix) Obtain tuple of column values associated with index.

Methods inherited from class java.lang.Object

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

Constructor Detail

UncompressedBitmap

public UncompressedBitmap(DblArrayIntListHashMap distinctVals,
                          int numColumns)

UncompressedBitmap

public UncompressedBitmap(DoubleIntListHashMap distinctVals)

Method Detail

getNumColumns

public int getNumColumns()

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()

Obtain number of distinct values in the column.

Returns:

number of distinct values in the column; this number is also the number of bitmaps, since there is one bitmap per value

getOffsetsList

public int[] getOffsetsList(int ix)

Obtain array of offsets of the rows containing index value

Parameters:

ix - index of a particular distinct value

Returns:

IMMUTABLE array of the offsets of the rows containing the value with the indicated index

getNumOffsets

public int getNumOffsets()