private static boolean keepCurrent(Calendar asOfDate) {
boolean keepCurrent = false;
int monthNow = asOfDate.get(Calendar.MONTH);
// March, June, September, and December are expiration months
boolean isExpirationMonth = ((monthNow + 1) % 3 == 0);
if (isExpirationMonth) {
Calendar volumeShiftDate = (Calendar) asOfDate.clone();
// Find first Friday
volumeShiftDate.set(Calendar.DAY_OF_MONTH, 1);
while (volumeShiftDate.get(Calendar.DAY_OF_WEEK) != Calendar.FRIDAY) {
volumeShiftDate.add(Calendar.DAY_OF_MONTH, 1);
}
// Shift to third Friday
volumeShiftDate.add(Calendar.WEEK_OF_MONTH, 2);
// Finally, find the day before second Friday
volumeShiftDate.add(Calendar.DAY_OF_MONTH, -8);
if (asOfDate.before(volumeShiftDate)) {
keepCurrent = true;
}
}
return keepCurrent;
}
/**
* Finds the next occurrence for monthly Nth recurrence.
*
* @param startDate the start date of the previous calendar item.
* @param endDate the end date of the previous calendar item.
* @return the next item
*/
public CalendarItemTimerTask nextMonthN(Date startDate, Date endDate) {
int dayOfWeekInMonth = (patternSpecific2 == 5 ? -1 : patternSpecific2);
long duration = sourceTask.getEndDate().getTime() - sourceTask.getStartDate().getTime();
Calendar cal = Calendar.getInstance();
cal.setTime(startDate);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.MONTH, period);
cal.setTime(getMonthNStartDate(cal.getTime(), dayOfWeekInMonth));
Date currentDate = new Date();
if (cal.getTimeInMillis() + duration < currentDate.getTime()) {
Calendar cal2 = Calendar.getInstance();
cal2.setTime(currentDate);
int years = cal2.get(Calendar.YEAR) - cal.get(Calendar.YEAR);
int months = (years * 12) + (cal2.get(Calendar.MONTH) - cal.get(Calendar.MONTH));
int monthsToAdd = months;
monthsToAdd -= months % period;
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.MONTH, monthsToAdd);
cal.setTime(getMonthNStartDate(cal.getTime(), dayOfWeekInMonth));
if (cal.getTimeInMillis() + duration < currentDate.getTime()) {
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.MONTH, monthsToAdd);
cal.setTime(getMonthNStartDate(cal.getTime(), dayOfWeekInMonth));
}
}
Calendar cal2 = (Calendar) cal.clone();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
while (deletedInstances.contains(cal.getTime())) {
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.MONTH, period);
startDate = null;
for (int dayOfWeek : allowedDaysOfWeek) {
cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);
cal.set(Calendar.DAY_OF_WEEK_IN_MONTH, dayOfWeekInMonth);
if ((cal.after(startDate) && dayOfWeekInMonth == -1)
|| (cal.before(startDate) && dayOfWeekInMonth != -1)
|| startDate == null) {
startDate = cal.getTime();
cal2.set(Calendar.YEAR, cal.get(Calendar.YEAR));
cal2.set(Calendar.MONTH, cal.get(Calendar.MONTH));
cal2.set(Calendar.DATE, cal.get(Calendar.DATE));
}
}
}
startDate = cal2.getTime();
endDate = new Date(startDate.getTime() + duration);
if (dateOutOfRange(endDate)) return null;
boolean executeNow = false;
if (startDate.before(currentDate)) {
executeNow = true;
}
return new CalendarItemTimerTask(
sourceTask.getStatus(), startDate, endDate, sourceTask.getId(), executeNow, this);
}