Create stream of streams from one long stream

Question

I want to split a single Stream into a Stream of Streams based on the contents of the Streams. The resulting the St

Answer 1

You may want to implement your own aggregating spliterator to do this. There's already something similar in the proton-pack library (the first link redirects to the one implemented in proton-pack).

Note that you get a Stream> (you may try to modify the implementation to have a Stream> directly, but you always need to buffer a small amount elements; depending on the window's size; to test whether you should create a new window or not). So for example:

StreamUtils.aggregate(Stream.of(1, 1, 1, 2, 2, 2, 3, 6, 7, 7, 1, 1), 
                      Objects::equals)
           .forEach(System.out::println);

outputs:

[1, 1, 1]
[2, 2, 2]
[3]
[6]
[7, 7]
[1, 1]