org.apache.datasketches.tuple

Class Sketches

java.lang.Object

org.apache.datasketches.tuple.Sketches

public final class Sketches
extends Object

Convenient static methods to instantiate generic tuple sketches.

Constructor Summary

Constructors

Constructor and Description
Sketches()

Method Summary

Modifier and Type	Method and Description
static <S extends Summary> Sketch<S>	createEmptySketch()
static <S extends Summary> Sketch<S>	heapifySketch(org.apache.datasketches.memory.Memory mem, SummaryDeserializer<S> deserializer) Instantiate a Sketch from a given Memory.
static <U,S extends UpdatableSummary<U>> UpdatableSketch<U,S>	heapifyUpdatableSketch(org.apache.datasketches.memory.Memory mem, SummaryDeserializer<S> deserializer, SummaryFactory<S> summaryFactory) Deprecated. As of 3.0.0, heapifying an UpdatableSketch is deprecated. This capability will be removed in a future release. Heapifying a CompactSketch is not deprecated.

Methods inherited from class java.lang.Object

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

Constructor Detail

Sketches

public Sketches()

Method Detail

createEmptySketch

public static <S extends Summary> Sketch<S> createEmptySketch()

Type Parameters:

S - Type of Summary

Returns:

an empty instance of Sketch

heapifySketch

public static <S extends Summary> Sketch<S> heapifySketch(org.apache.datasketches.memory.Memory mem,
                                                          SummaryDeserializer<S> deserializer)

Instantiate a Sketch from a given Memory.

As of 3.0.0, heapifying an UpdatableSketch is deprecated. This capability will be removed in a future release. Heapifying a CompactSketch is not deprecated.

Type Parameters:

S - Type of Summary

Parameters:

mem - Memory object representing a Sketch

deserializer - instance of SummaryDeserializer

Returns:

Sketch created from its Memory representation

heapifyUpdatableSketch

@Deprecated
public static <U,S extends UpdatableSummary<U>> UpdatableSketch<U,S> heapifyUpdatableSketch(org.apache.datasketches.memory.Memory mem,
                                                                                                        SummaryDeserializer<S> deserializer,
                                                                                                        SummaryFactory<S> summaryFactory)

Deprecated. As of 3.0.0, heapifying an UpdatableSketch is deprecated. This capability will be removed in a future release. Heapifying a CompactSketch is not deprecated.

Instantiate UpdatableSketch from a given Memory

Type Parameters:

U - Type of update value

S - Type of Summary

Parameters:

mem - Memory object representing a Sketch

deserializer - instance of SummaryDeserializer

summaryFactory - instance of SummaryFactory

Returns:

Sketch created from its Memory representation