Package org.roaringbitmap

Class ParallelAggregation.ContainerCollector

java.lang.Object

org.roaringbitmap.ParallelAggregation.ContainerCollector

All Implemented Interfaces:

Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

Enclosing class:

ParallelAggregation

public static class ParallelAggregation.ContainerCollector
extends Object
implements Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

Collects containers grouped by their key into a RoaringBitmap, applying the supplied aggregation function to each group.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.stream.Collector

Collector.Characteristics

Constructor Summary

Constructors

Constructor	Description
ContainerCollector(Function<List<Container>,Container> reducer)	Creates a collector with the reducer function.

Method Summary

Modifier and Type	Method	Description
BiConsumer<RoaringArray,Map.Entry<Short,List<Container>>>	accumulator()
Set<Collector.Characteristics>	characteristics()
BinaryOperator<RoaringArray>	combiner()
Function<RoaringArray,RoaringBitmap>	finisher()
Supplier<RoaringArray>	supplier()

Methods inherited from class java.lang.Object

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

Constructor Detail

ContainerCollector

public ContainerCollector(Function<List<Container>,Container> reducer)

Creates a collector with the reducer function.

Parameters:

reducer - a function to apply to containers with the same key.

Method Detail

supplier

public Supplier<RoaringArray> supplier()

Specified by:

supplier in interface Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

accumulator

public BiConsumer<RoaringArray,Map.Entry<Short,List<Container>>> accumulator()

Specified by:

accumulator in interface Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

combiner

public BinaryOperator<RoaringArray> combiner()

Specified by:

combiner in interface Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

finisher

public Function<RoaringArray,RoaringBitmap> finisher()

Specified by:

finisher in interface Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>

characteristics

public Set<Collector.Characteristics> characteristics()

Specified by:

characteristics in interface Collector<Map.Entry<Short,List<Container>>,RoaringArray,RoaringBitmap>