Package one.util.streamex
Interface MergingCollector<T,A,R>
- Type Parameters:
T
- the type of input elements to the reduction operationA
- the mutable accumulation type of the reduction operation (often hidden as an implementation detail)R
- the result type of the reduction operation
- All Superinterfaces:
Collector<T,
A, R>
- All Known Subinterfaces:
DoubleCollector<A,
,R> IntCollector<A,
,R> LongCollector<A,
R>
- All Known Implementing Classes:
Internals.BaseCollector
,Internals.DoubleCollectorImpl
,Internals.IntCollectorImpl
,Internals.LongCollectorImpl
,Internals.PartialCollector
A
MergingCollector
is a Collector
with more specific
combining algorithm. Instead of providing a combiner which can create new
partial result the MergingCollector
must provide a merger which
merges the second partial result into the first one.-
Nested Class Summary
Nested classes/interfaces inherited from interface java.util.stream.Collector
Collector.Characteristics
-
Method Summary
Modifier and TypeMethodDescriptiondefault BinaryOperator<A>
combiner()
A function that accepts two partial results and combines them returning either existing partial result or new one.BiConsumer<A,
A> merger()
A function that merges the second partial result into the first partial result.Methods inherited from interface java.util.stream.Collector
accumulator, characteristics, finisher, supplier
-
Method Details
-
merger
BiConsumer<A,A> merger()A function that merges the second partial result into the first partial result.- Returns:
- a function that merges the second partial result into the first partial result.
-
combiner
A function that accepts two partial results and combines them returning either existing partial result or new one.The default implementation calls the
merger()
and returns the first partial result.
-