add processing to java iterator

IteratorInterceptor.java

public static <I,O> Iterable<O> iteratorInterceptor(final Iterable<I> iterable, final Function<I, O> processor) {
    return () -> {
         final Iterator<I> iterator = iterable.iterator();
         return new Iterator<>() {
            @Override
            public boolean hasNext() { return iterator.hasNext(); }

            @Override
            public O next() { return processor.apply(iterator.next()); }
        };
    };
}