Package org.roaringbitmap.buffer

Class BufferParallelAggregation.ContainerCollector

java.lang.Object

org.roaringbitmap.buffer.BufferParallelAggregation.ContainerCollector

All Implemented Interfaces:

java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

Enclosing class:

BufferParallelAggregation

public static class BufferParallelAggregation.ContainerCollector
extends java.lang.Object
implements java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.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

java.util.stream.Collector.Characteristics

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ContainerCollector

public ContainerCollector(java.util.function.Function<java.util.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 java.util.function.Supplier<MutableRoaringArray> supplier()

Specified by:

supplier in interface java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

accumulator

public java.util.function.BiConsumer<MutableRoaringArray,java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>> accumulator()

Specified by:

accumulator in interface java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

combiner

public java.util.function.BinaryOperator<MutableRoaringArray> combiner()

Specified by:

combiner in interface java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

finisher

public java.util.function.Function<MutableRoaringArray,MutableRoaringBitmap> finisher()

Specified by:

finisher in interface java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>

characteristics

public java.util.Set<java.util.stream.Collector.Characteristics> characteristics()

Specified by:

characteristics in interface java.util.stream.Collector<java.util.Map.Entry<java.lang.Short,java.util.List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>