Package org.apache.datasketches.quantilescommon

Class DoublesSketchSortedView

java.lang.Object

org.apache.datasketches.quantilescommon.DoublesSketchSortedView

All Implemented Interfaces:

DoublesSortedView, SortedView

public final class DoublesSketchSortedView
extends Object
implements DoublesSortedView

The SortedView of the Quantiles Classic DoublesSketch and the KllDoublesSketch.

Author:

Alexander Saydakov, Lee Rhodes

Constructor Summary

Constructors

Constructor	Description
DoublesSketchSortedView(double[] quantiles, long[] cumWeights, QuantilesDoublesAPI sk)	Construct from elements, also used in testing.

Method Summary

Modifier and Type	Method	Description
long[]	getCumulativeWeights()	Returns the array of cumulative weights from the sketch.
double	getMaxItem()	Returns the maximum item of the stream.
double	getMinItem()	Returns the minimum item of the stream.
long	getN()	Returns the total number of items presented to the sourcing sketch.
int	getNumRetained()	Gets the number of quantiles retained by this sorted view.
double	getQuantile(double rank, QuantileSearchCriteria searchCrit)	Gets the approximate quantile of the given normalized rank and the given search criterion.
double[]	getQuantiles()	Returns an array of all retained quantiles by the sketch.
double	getRank(double quantile, QuantileSearchCriteria searchCrit)	Gets the normalized rank corresponding to the given a quantile.
boolean	isEmpty()	Returns true if this sorted view is empty.
DoublesSortedViewIterator	iterator()	Returns an iterator for this Sorted View.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.datasketches.quantilescommon.DoublesSortedView

getCDF, getPMF

Constructor Details

DoublesSketchSortedView

public DoublesSketchSortedView(double[] quantiles,
 long[] cumWeights,
 QuantilesDoublesAPI sk)

Construct from elements, also used in testing.

Parameters:

quantiles - sorted array of quantiles

cumWeights - sorted, monotonically increasing cumulative weights.

sk - the underlying quantile sketch.

Method Details

getCumulativeWeights

public long[] getCumulativeWeights()

Description copied from interface: SortedView

Returns the array of cumulative weights from the sketch. Also known as the natural ranks, which are the Natural Numbers on the interval [1, N].

Specified by:

getCumulativeWeights in interface SortedView

Returns:

the array of cumulative weights (or natural ranks).

getMaxItem

public double getMaxItem()

Description copied from interface: DoublesSortedView

Returns the maximum item of the stream. This may be distinct from the largest item retained by the sketch algorithm.

Specified by:

getMaxItem in interface DoublesSortedView

Returns:

the maximum item of the stream

getMinItem

public double getMinItem()

Description copied from interface: DoublesSortedView

Returns the minimum item of the stream. This may be distinct from the smallest item retained by the sketch algorithm.

Specified by:

getMinItem in interface DoublesSortedView

Returns:

the minimum item of the stream

getN

public long getN()

Description copied from interface: SortedView

Returns the total number of items presented to the sourcing sketch.

Specified by:

getN in interface SortedView

Returns:

the total number of items presented to the sourcing sketch.

getNumRetained

public int getNumRetained()

Description copied from interface: SortedView

Gets the number of quantiles retained by this sorted view. This may be slightly different from the function with the same name when called from the originating sketch.

Specified by:

getNumRetained in interface SortedView

Returns:

the number of quantiles retained by this sorted view

getQuantile

public double getQuantile(double rank,
 QuantileSearchCriteria searchCrit)

Description copied from interface: DoublesSortedView

Gets the approximate quantile of the given normalized rank and the given search criterion.

Specified by:

getQuantile in interface DoublesSortedView

Parameters:

rank - the given normalized rank, a double in the range [0.0, 1.0].

searchCrit - If INCLUSIVE, the given rank includes all quantiles ≤ the quantile directly corresponding to the given rank. If EXCLUSIVE, he given rank includes all quantiles < the quantile directly corresponding to the given rank.

Returns:

the approximate quantile given the normalized rank.

See Also:

• QuantileSearchCriteria

getQuantiles

public double[] getQuantiles()

Description copied from interface: DoublesSortedView

Returns an array of all retained quantiles by the sketch.

Specified by:

getQuantiles in interface DoublesSortedView

Returns:

an array of all retained quantiles by the sketch.

getRank

public double getRank(double quantile,
 QuantileSearchCriteria searchCrit)

Description copied from interface: DoublesSortedView

Gets the normalized rank corresponding to the given a quantile.

Specified by:

getRank in interface DoublesSortedView

Parameters:

quantile - the given quantile

searchCrit - if INCLUSIVE the given quantile is included into the rank.

Returns:

the normalized rank corresponding to the given quantile.

See Also:

• QuantileSearchCriteria

isEmpty

public boolean isEmpty()

Description copied from interface: SortedView

Returns true if this sorted view is empty.

Specified by:

isEmpty in interface SortedView

Returns:

true if this sorted view is empty.

iterator

public DoublesSortedViewIterator iterator()

Description copied from interface: SortedView

Returns an iterator for this Sorted View.

Specified by:

iterator in interface DoublesSortedView

Specified by:

iterator in interface SortedView

Returns:

an iterator for this Sorted View.