Convert Iterator to Iterable in Java

gistfile1.txt

    private static <T> Iterable<T> once(final Iterator<T> source) {
        return new Iterable<T>() {
            private AtomicBoolean exhausted = new AtomicBoolean();
            @Override
            public Iterator<T> iterator() {
                Preconditions.checkState(!exhausted.getAndSet(true));
                return source;
            }
        };
    }