JDK-8071597: close original Stream in default implementation?

[Tagir F. Valeev]

Hello,

I was looking at default implementation of new Stream
takeWhile/dropWhile methods:

http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8071597-take-drop-while/webrev/src/java.base/share/classes/java/util/stream/Stream.java.cdiff.html

I think in order to make this default behavior more consistent, the
original Stream must be closed when the returned one is closed. Thus,
takeWhile return statement should look like this:

return StreamSupport.stream(
     new WhileOps.UnorderedWhileSpliterator.OfRef.Taking<>
     (spliterator(), true, predicate),
     isParallel()).onClose(this::close);

The same for dropWhile method.

What do you think?

Regards,
Tagir Valeev.