Package org.roaringbitmap.buffer
Class BufferParallelAggregation.ContainerCollector
- java.lang.Object
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- org.roaringbitmap.buffer.BufferParallelAggregation.ContainerCollector
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- 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.
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Nested Class Summary
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Nested classes/interfaces inherited from interface java.util.stream.Collector
Collector.Characteristics
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Constructor Summary
Constructors Constructor Description ContainerCollector(Function<List<MappeableContainer>,MappeableContainer> reducer)
Creates a collector with the reducer function.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description BiConsumer<MutableRoaringArray,Map.Entry<Short,List<MappeableContainer>>>
accumulator()
Set<Collector.Characteristics>
characteristics()
BinaryOperator<MutableRoaringArray>
combiner()
Function<MutableRoaringArray,MutableRoaringBitmap>
finisher()
Supplier<MutableRoaringArray>
supplier()
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Constructor Detail
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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.
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Method Detail
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supplier
public Supplier<MutableRoaringArray> supplier()
- Specified by:
supplier
in interfaceCollector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>
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accumulator
public BiConsumer<MutableRoaringArray,Map.Entry<Short,List<MappeableContainer>>> accumulator()
- Specified by:
accumulator
in interfaceCollector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>
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combiner
public BinaryOperator<MutableRoaringArray> combiner()
- Specified by:
combiner
in interfaceCollector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>
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finisher
public Function<MutableRoaringArray,MutableRoaringBitmap> finisher()
- Specified by:
finisher
in interfaceCollector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>
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characteristics
public Set<Collector.Characteristics> characteristics()
- Specified by:
characteristics
in interfaceCollector<Map.Entry<Short,List<MappeableContainer>>,MutableRoaringArray,MutableRoaringBitmap>
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