Package org.apache.datasketches.tuple.arrayofdoubles

Class ArrayOfDoublesIntersection

java.lang.Object

org.apache.datasketches.tuple.arrayofdoubles.ArrayOfDoublesIntersection

public abstract class ArrayOfDoublesIntersection
extends Object

Computes the intersection of two or more tuple sketches of type ArrayOfDoubles. A new instance represents the Universal Set. Every update() computes an intersection with the internal set and can only reduce the internal set.

Method Summary

Modifier and Type	Method	Description
protected abstract org.apache.datasketches.tuple.arrayofdoubles.ArrayOfDoublesQuickSelectSketch	createSketch(int nomEntries, int numValues, long seed)
ArrayOfDoublesCompactSketch	getResult()	Gets the internal set as an on-heap compact sketch.
ArrayOfDoublesCompactSketch	getResult(org.apache.datasketches.memory.WritableMemory dstMem)	Gets the result of stateful intersections so far.
void	intersect(ArrayOfDoublesSketch tupleSketch, ArrayOfDoublesCombiner combiner)	Performs a stateful intersection of the internal set with the given tupleSketch.
void	reset()	Resets the internal set to the initial state, which represents the Universal Set

Methods inherited from class java.lang.Object

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

Method Detail

intersect

public void intersect(ArrayOfDoublesSketch tupleSketch,
                      ArrayOfDoublesCombiner combiner)

Performs a stateful intersection of the internal set with the given tupleSketch. The given tupleSketch and the internal state must have the same numValues.

Parameters:

tupleSketch - Input sketch to intersect with the internal set.

combiner - Method of combining two arrays of double values

getResult

public ArrayOfDoublesCompactSketch getResult()

Gets the internal set as an on-heap compact sketch.

Returns:

Result of the intersections so far as a compact sketch.

getResult

public ArrayOfDoublesCompactSketch getResult(org.apache.datasketches.memory.WritableMemory dstMem)

Gets the result of stateful intersections so far.

Parameters:

dstMem - Memory for the compact sketch (can be null).

Returns:

Result of the intersections so far as a compact sketch.

reset

public void reset()

Resets the internal set to the initial state, which represents the Universal Set

createSketch

protected abstract org.apache.datasketches.tuple.arrayofdoubles.ArrayOfDoublesQuickSelectSketch createSketch(int nomEntries,
                                                                                                             int numValues,
                                                                                                             long seed)