Method withValue

base/src/main/java/net/time4j/Weekmodel.java:1275–1299

(
            T context,
            Weekday value,
            boolean lenient
        )

        }

        @Override
        public T withValue(
            T context,
            Weekday value,
            boolean lenient
        ) {

            if (value == null) {
                throw new IllegalArgumentException("Missing weekday.");
            }

            PlainDate date = context.get(CALENDAR_DATE);
            long utcDays = date.getDaysSinceUTC();
            Weekday current = getDayOfWeek(utcDays);

            if (value == current) {
                return context;
            }

            int old = current.getValue(this.element.getModel());
            int neu = value.getValue(this.element.getModel());
            date = date.withDaysSinceUTC(utcDays + neu - old);
            return context.with(CALENDAR_DATE, date);

        }

        @Override
        public ChronoElement<?> getChildAtFloor(T context) {