Method isValid

base/src/main/java/net/time4j/Weekmodel.java:1851–1869

(
            T context,
            Integer value
        )

        }

        @Override
        public boolean isValid(
            T context,
            Integer value
        ) {

            if (value == null) {
                return false;
            }

            int v = value.intValue();
            PlainDate date = context.get(CALENDAR_DATE);

            return (
                (v >= this.getMinWeek(date))
                && (v <= this.getMaxWeek(date))
            );

        }

        @Override
        public T withValue(