org.roaringbitmap.buffer

Class BufferParallelAggregation.ContainerCollector

java.lang.Object

org.roaringbitmap.buffer.BufferParallelAggregation.ContainerCollector

All Implemented Interfaces:

Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

Enclosing class:

BufferParallelAggregation

public static class BufferParallelAggregation.ContainerCollector
extends Object
implements Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.stream.Collector

of, of

Constructor Detail

ContainerCollector

public ContainerCollector(Function<List<MappeableContainer>,MappeableContainer> 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<MutableRoaringArray> supplier()

Specified by:

supplier in interface Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

accumulator

public BiConsumer<MutableRoaringArray,Map.Entry<Short,List<MappeableContainer>>> accumulator()

Specified by:

accumulator in interface Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

combiner

public BinaryOperator<MutableRoaringArray> combiner()

Specified by:

combiner in interface Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

finisher

public Function<MutableRoaringArray,MutableRoaringBitmap> finisher()

Specified by:

finisher in interface Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

characteristics

public Set<Collector.Characteristics> characteristics()

Specified by:

characteristics in interface Collector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>