Package org.aksw.commons.util.stream

Interface StreamFunction<I,O>

Type Parameters:

I -

O -

All Superinterfaces:

Function<Stream<I>,Stream<O>>, Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface StreamFunction<I,O>
extends Function<Stream<I>,Stream<O>>, Serializable

Helper interface to make transformations on streams less verbose Inherits from Function for out of the box chaining with Function.andThen(Function).

Author:

Claus Stadler 11/09/2020

Method Summary

Modifier and Type	Method	Description
default <X> StreamFunction<I,X>	andThen(StreamFunction<O,X> next)	Generic chaining: StreamFunction<I, O> fn = StreamFunction.identity() .andThen(a -> fn(a))...andThen(o -> fn(o));...
default <X> StreamFunction<I,X>	andThenFlatMap(SerializableFunction<O,? extends Stream<X>> mapper)
default <X> StreamFunction<I,X>	andThenFlatMapIterable(SerializableFunction<O,? extends Iterable<X>> mapper)
default <X> StreamFunction<I,X>	andThenMap(SerializableFunction<O,X> mapper)	{@code andThenMap(x -> y) is a short hand for {@code andThen(flowable -> flowable.map(x -> y))} @param <X> @param mapper @return
static <I, O> StreamFunction<I,O>	from(StreamFunction<I,O> rxfn)
static <X> StreamFunction<X,X>	identity()
static <X> StreamFunction<X,X>	identity(Class<X> cls)	Identity function that is more natural to use than the no-arg version:

Methods inherited from interface java.util.function.Function

andThen, apply, compose

Method Details

andThen

default <X> StreamFunction<I,X> andThen(StreamFunction<O,X> next)

Generic chaining: StreamFunction<I, O> fn = StreamFunction.identity() .andThen(a -> fn(a))...andThen(o -> fn(o));...

Type Parameters:

X -

Parameters:

next -

Returns:

andThenMap

default <X> StreamFunction<I,X> andThenMap(SerializableFunction<O,X> mapper)

{@code andThenMap(x -> y) is a short hand for {@code andThen(flowable -> flowable.map(x -> y))} @param <X> @param mapper @return

andThenFlatMap

default <X> StreamFunction<I,X> andThenFlatMap(SerializableFunction<O,? extends Stream<X>> mapper)

andThenFlatMapIterable

default <X> StreamFunction<I,X> andThenFlatMapIterable(SerializableFunction<O,? extends Iterable<X>> mapper)

from

static <I,
O> StreamFunction<I,O> from(StreamFunction<I,O> rxfn)

identity

static <X> StreamFunction<X,X> identity()

identity

static <X> StreamFunction<X,X> identity(Class<X> cls)

Identity function that is more natural to use than the no-arg version:

StreamFunction.identity(MyClass.class).andThen(rest)