Hi Remi,
That was also the first failed lookup try after starting with Lambdas,
specially because we got a lot of own implementation implementing Iterable. It
would have been more natural from me to find some according methods on the
Stream interface. Especially as a beginner.
Cheers Patrick
Am 16.11.2013 um 15:00 schrieb Remi Forax <fo...@univ-mlv.fr>:
> During Devoxx Belgium, after the talk of Brian and Jose Paumard, there was an
> interesting discussion among some Java8 early adopters about the fact that in
> the API there no xommon way to get a Stream for anything that is conceptually
> a collection.
>
> I propose to introduce the following new methods on Stream:
>
> /**
> * Returns a sequential|Stream| with the iterable as its source.
> *
> * @param T the type of stream elements.
> * @param iterable the iterable used as source of the stream.
> * @return a sequential stream.
> */
> public static <T> Stream<T> from(Iterable<T> iterable) {
> return StreamSupport.stream(iterable.spliterator(), false);
> }
>
> /**
> * Returns a sequential|Stream| with the collection as its source.
> *
> * @param T the type of stream elements.
> * @param collection the collection used as source of the stream.
> * @return a sequential stream.
> */
> public static <T> Stream<T> from(Collection<T> collection) {
> return collection.stream();
> }
>
> /**
> * Returns a sequential|Stream| with the array as its source.
> *
> * @param T the type of stream elements.
> * @param array the array used as source of the stream.
> * @return a sequential stream.
> */
> public static <T> Stream<T> from(T[] array) {
> return Stream.of(array);
> }
>
> These methods are like the of() methods but of() overloads deal with values
> while from() deal with collections.
>
> This also re-introduce a way to get a stream from an unknown Iterable that
> was removed from Iterable
> because we want implementation of Iterable to be able to return Stream of
> primitives.
> I know that this is late in the game, but I think that given these methods
> just delegates to existing methods,
> it will be better to introduce them in Java8 than in Java9.
>
> cheers,
> Rémi
>
