Grouping stream elements by their position - how to handle tail of stream ?

[Boaz Nahum]

Hi.

I looking in Stream interface for a way to convert a stream of
   {  t1, t2, .. Tn }
to
   { {t1,t2}, ... {Tn-1, Tn} }
or
   { {t1,t2}, ... {Tn, null}}

Lets assume {t1, t2} are aggeraget by Pair<T,T>



So I tried to use explode:

*        Stream<Integer> si = Arrays.asList(1, 2, 3, 4, 5).stream();

        Stream<Pair<Integer, Integer>> spi = si.sequential().explode(new
BiConsumer<Stream.Downstream<Pair<Integer, Integer>>, Integer>() {

            Integer firstValue;

            @Override
            public void accept(Stream.Downstream<Pair<Integer, Integer>>
pairDownstream, Integer v) {

                if (firstValue == null) {
                    firstValue = v;
                } else {

                    pairDownstream.send(new Pair<>(firstValue, v));
                    firstValue = null;

                }
            }

        });
*

But I didn't find a way to add the tail of input stream {.., 5} to the new
stream { ,,, {5, null}}.

Of-course this only simplified example of more general problem I have.

Thanks
Boaz