/** * Obtains an instance of {@code WeekFields} from the first day-of-week and minimal days. * <p> * The first day-of-week defines the ISO {@code DayOfWeek} that is day 1 of the week. * The minimal number of days in the first week defines how many days must be present * in a month or year, starting from the first day-of-week, before the week is counted * as the first week. A value of 1 will count the first day of the month or year as part * of the first week, whereas a value of 7 will require the whole seven days to be in * the new month or year. * <p> * WeekFields instances are singletons; for each unique combination * of {@code firstDayOfWeek} and {@code minimalDaysInFirstWeek} the * the same instance will be returned. * * @param firstDayOfWeek the first day of the week, not null * @param minimalDaysInFirstWeek the minimal number of days in the first week, from 1 to 7 * @return the week-definition, not null * @throws IllegalArgumentException if the minimal days value is less than one * or greater than 7 */ public static WeekFields of(DayOfWeek firstDayOfWeek, int minimalDaysInFirstWeek) { String key = firstDayOfWeek.toString() + minimalDaysInFirstWeek; WeekFields rules = CACHE.get(key); if (rules == null) { rules = new WeekFields(firstDayOfWeek, minimalDaysInFirstWeek); CACHE.putIfAbsent(key, rules); rules = CACHE.get(key); } return rules; }
/** * Obtains an instance of {@code WeekFields} from the first day-of-week and minimal days. * <p> * The first day-of-week defines the ISO {@code DayOfWeek} that is day 1 of the week. * The minimal number of days in the first week defines how many days must be present * in a month or year, starting from the first day-of-week, before the week is counted * as the first week. A value of 1 will count the first day of the month or year as part * of the first week, whereas a value of 7 will require the whole seven days to be in * the new month or year. * <p> * WeekFields instances are singletons; for each unique combination * of {@code firstDayOfWeek} and {@code minimalDaysInFirstWeek} the * the same instance will be returned. * * @param firstDayOfWeek the first day of the week, not null * @param minimalDaysInFirstWeek the minimal number of days in the first week, from 1 to 7 * @return the week-definition, not null * @throws IllegalArgumentException if the minimal days value is less than one * or greater than 7 */ public static WeekFields of(DayOfWeek firstDayOfWeek, int minimalDaysInFirstWeek) { String key = firstDayOfWeek.toString() + minimalDaysInFirstWeek; WeekFields rules = CACHE.get(key); if (rules == null) { rules = new WeekFields(firstDayOfWeek, minimalDaysInFirstWeek); CACHE.putIfAbsent(key, rules); rules = CACHE.get(key); } return rules; }