private void addTransitions(VComponent timeRule, long from, long to) throws Exception {
int offset;
int previousOffset;
String start;
long startTime;
long time;
String transitionName;
Property tzName = timeRule.getProperty("TZNAME");
Property tzOffsetFrom = timeRule.getProperty("TZOFFSETFROM");
Property tzOffsetTo = timeRule.getProperty("TZOFFSETTO");
Property tzDtStart = timeRule.getProperty("DTSTART");
Property tzRRule = timeRule.getProperty("RRULE");
Property tzRDate = timeRule.getProperty("RDATE");
if (tzDtStart != null) {
start = tzDtStart.getValue();
startTime = parseDateTime(start);
} else {
throw new Exception("Required property DTSTART (of a time zone) is missing");
}
if (tzOffsetTo != null) {
offset = parseOffset(tzOffsetTo.getValue());
} else {
throw new Exception("Required property TZOFFSETTO is missing");
}
if (tzOffsetFrom != null) {
previousOffset = parseOffset(tzOffsetFrom.getValue());
} else {
throw new Exception("Required property TZOFFSETFROM is missing");
}
if (tzName != null) {
transitionName = tzName.getValue();
} else {
transitionName = "";
}
if (tzRDate != null) {
String[] rDates = tzRDate.getValue().split(",");
for (String rDate : rDates) {
time = parseDateTime(rDate);
transitions.add(new TimeZoneTransition(offset, time, transitionName));
}
}
if (tzRRule != null) {
RecurrencePattern rrule =
VCalendarContentConverter.getRecurrencePattern(
start,
null,
tzRRule.getValue(),
null, // as of specs
false); // iCalendar
if (((rrule.getTypeId() == RecurrencePattern.TYPE_MONTH_NTH) && (rrule.getInterval() == 12))
|| ((rrule.getTypeId() == RecurrencePattern.TYPE_YEAR_NTH)
&& (rrule.getInterval() == 1))) { // yearly
int dayOfWeek = getDayOfWeekFromMask(rrule.getDayOfWeekMask());
if (dayOfWeek > 0) { // one day
TimeZone fixed = TimeZone.getTimeZone("UTC");
fixed.setRawOffset(previousOffset);
Calendar finder = new GregorianCalendar(fixed);
finder.setTimeInMillis(startTime); // Sets hour and minutes
int hh = finder.get(Calendar.HOUR_OF_DAY);
int mm = finder.get(Calendar.MINUTE);
int m = rrule.getMonthOfYear() - 1; // Yes, it works
int yearStart = year(startTime);
int yearFrom = (startTime > from) ? yearStart : year(from);
int yearTo = year(to);
if (rrule.isNoEndDate()) {
int count = rrule.getOccurrences();
int yearRecurrenceEnd;
if (count != -1) {
yearRecurrenceEnd = yearStart + count - 1;
if (yearRecurrenceEnd < yearTo) {
yearTo = yearRecurrenceEnd;
}
}
} else {
try {
int yearRecurrenceEnd = year(rrule.getEndDatePattern());
if (yearRecurrenceEnd < yearTo) {
yearTo = yearRecurrenceEnd;
}
} catch (ParseException e) {
// Ignores the UNTIL part
}
}
for (int y = yearFrom; y <= yearTo; y++) {
finder.clear();
finder.set(Calendar.YEAR, y);
finder.set(Calendar.MONTH, m);
finder.set(Calendar.DAY_OF_WEEK, dayOfWeek);
finder.set(Calendar.DAY_OF_WEEK_IN_MONTH, rrule.getInstance());
finder.set(Calendar.HOUR_OF_DAY, hh);
finder.set(Calendar.MINUTE, mm);
long transitionTime = finder.getTimeInMillis() - (previousOffset - getBasicOffset());
transitions.add(new TimeZoneTransition(offset, transitionTime, transitionName));
}
}
}
}
}