Method addTo

base/src/main/java/net/time4j/YOWElement.java:286–316

(
            T entity,
            long amount
        )

        //~ Methoden ------------------------------------------------------

        @Override
        public T addTo(
            T entity,
            long amount
        ) {

            if (amount == 0) {
                return entity;
            }

            int yow =
                MathUtils.safeCast(
                    MathUtils.safeAdd(
                        entity.get(YOWElement.INSTANCE).intValue(),
                        amount)
                    );

            PlainDate date = entity.get(CALENDAR_DATE);
            int woy = date.getWeekOfYear();
            Weekday dow = date.getDayOfWeek();

            if (woy == 53) {
                PlainDate test = PlainDate.of(yow, 26, dow);
                woy = test.getMaximum(Weekmodel.ISO.weekOfYear());
            }

            return entity.with(
                CALENDAR_DATE,
                PlainDate.of(yow, woy, dow));

        }

        @Override
        public long between(