/** Initialize RRule instance */
private static RRule initRRule(String recurrence) throws ParseException {
RRule rrule = new RRule(recurrence);
// handle the iCalendar "byDay" field differently depending on if
// we are weekly or otherwise
if (rrule.getFreq() != Frequency.WEEKLY) rrule.setByDay(Collections.EMPTY_LIST);
return rrule;
}
private void setRRuleDays(RRule rrule, Weekday... weekdays) {
ArrayList<WeekdayNum> days = new ArrayList<WeekdayNum>();
for (Weekday wd : weekdays) days.add(new WeekdayNum(0, wd));
rrule.setByDay(days);
}