T
- the type of the stream itemA
- the type of the accumulatorR
- the type of the aggregation resultpublic interface AggregateOperation1<T,A,R> extends AggregateOperation<A,R>
AggregateOperation
(refer to its extensive documentation) to the "arity-1" case with
a single data stream being aggregated over. AggregateOperations
contains factories for the built-in implementations and you can create
your own using the aggregate
operation builder.
All the functions must be stateless and cooperative.
Modifier and Type | Method and Description |
---|---|
BiConsumerEx<? super A,? super T> |
accumulateFn()
A primitive that updates the accumulator state to account for a new
item.
|
<R_NEW> AggregateOperation1<T,A,R_NEW> |
andThen(FunctionEx<? super R,? extends R_NEW> thenFn)
Returns a copy of this aggregate operation, but with the
export
and finish primitives composed with the supplied thenFn . |
default Collector<T,A,R> |
toCollector()
Deprecated.
|
<NEW_T> AggregateOperation1<NEW_T,A,R> |
withAccumulateFn(BiConsumerEx<? super A,? super NEW_T> accumulateFn)
Returns a copy of this aggregate operation, but with the
accumulate primitive replaced with the one supplied here. |
AggregateOperation1<T,A,A> |
withIdentityFinish()
Returns a copy of this aggregate operation, but with the
finish
primitive replaced with the identity function. |
accumulateFn, accumulateFn, arity, combineFn, createFn, deductFn, exportFn, finishFn, withAccumulateFns, withCombiningAccumulateFn, withCreate
@Nonnull BiConsumerEx<? super A,? super T> accumulateFn()
The consumer must be stateless and cooperative.
@Nonnull <NEW_T> AggregateOperation1<NEW_T,A,R> withAccumulateFn(BiConsumerEx<? super A,? super NEW_T> accumulateFn)
accumulate
primitive replaced with the one supplied here.
The consumer must be stateless and cooperative.
@Nonnull AggregateOperation1<T,A,A> withIdentityFinish()
AggregateOperation
finish
primitive replaced with the identity function. It will return the
accumulator object as-is. The returned aggregate operation does not
support the export
primitive.withIdentityFinish
in interface AggregateOperation<A,R>
@Nonnull <R_NEW> AggregateOperation1<T,A,R_NEW> andThen(FunctionEx<? super R,? extends R_NEW> thenFn)
AggregateOperation
export
and finish
primitives composed with the supplied thenFn
.
This replaces exportFn
with exportFn.andThen(thenFn)
,
same for finishFn
. The main use case is to transform the result
of an existing (library-provided) aggregate operation.
The given function must be stateless and cooperative.
andThen
in interface AggregateOperation<A,R>
R_NEW
- the type of the returned aggregate operation's resultthenFn
- the function to apply to the results of export
and finish
primitives@Nonnull @Deprecated default Collector<T,A,R> toCollector()
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