Method isEmpty

base/src/main/java/net/time4j/Duration.java:3082–3094

(TimeSpan<U> timespan)

    // wildcard capture
    private static <U> boolean isEmpty(TimeSpan<U> timespan) {

        List<Item<U>> items = timespan.getTotalLength();

        for (int i = 0, n = items.size(); i < n; i++) {
            if (items.get(i).getAmount() > 0) {
                return false;
            }
        }

        return true;

    }

    private static <U extends IsoUnit> Duration<U> create(
        Map<U, Long> map,