private static long Compute(ScheduleSpec spec, long afterTimeInMillis, TimeZoneInfo timeZone)
{
while (true)
{
DateTimeEx after;
if (spec.OptionalTimeZone != null)
{
try
{
timeZone = TimeZoneHelper.GetTimeZoneInfo(spec.OptionalTimeZone);
}
catch (TimeZoneNotFoundException)
{
// this behavior ensures we are consistent with Java, but IMO, it's bad behavior...
// basically, if the timezone is not found, we default to UTC.
timeZone = TimeZoneInfo.Utc;
}
after = new DateTimeEx(
afterTimeInMillis.TimeFromMillis(timeZone),
timeZone);
}
else
{
after = new DateTimeEx(
afterTimeInMillis.TimeFromMillis(timeZone),
timeZone);
}
var result = new ScheduleCalendar {
Milliseconds = after.Millisecond
};
ICollection <int> minutesSet = spec.UnitValues.Get(ScheduleUnit.MINUTES);
ICollection <int> hoursSet = spec.UnitValues.Get(ScheduleUnit.HOURS);
ICollection <int> monthsSet = spec.UnitValues.Get(ScheduleUnit.MONTHS);
ICollection <int> secondsSet = null;
bool isSecondsSpecified = false;
if (spec.UnitValues.ContainsKey(ScheduleUnit.SECONDS))
{
isSecondsSpecified = true;
secondsSet = spec.UnitValues.Get(ScheduleUnit.SECONDS);
}
if (isSecondsSpecified)
{
result.Second = NextValue(secondsSet, after.Second);
if (result.Second == -1)
{
result.Second = NextValue(secondsSet, 0);
after.AddMinutes(1);
}
}
result.Minute = NextValue(minutesSet, after.Minute);
if (result.Minute != after.Minute)
{
result.Second = NextValue(secondsSet, 0);
}
if (result.Minute == -1)
{
result.Minute = NextValue(minutesSet, 0);
after.AddHours(1);
}
result.Hour = NextValue(hoursSet, after.Hour);
if (result.Hour != after.Hour)
{
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
}
if (result.Hour == -1)
{
result.Hour = NextValue(hoursSet, 0);
after.AddDays(1, DateTimeMathStyle.Java);
}
// This call may change second, minute and/or hour parameters
// They may be reset to minimum values if the day rolled
result.DayOfMonth = DetermineDayOfMonth(spec, after, result);
bool dayMatchRealDate = false;
while (!dayMatchRealDate)
{
if (CheckDayValidInMonth(timeZone, result.DayOfMonth, after.Month, after.Year))
{
dayMatchRealDate = true;
}
else
{
after.AddMonths(1, DateTimeMathStyle.Java);
}
}
int currentMonth = after.Month;
result.Month = NextValue(monthsSet, currentMonth);
if (result.Month != currentMonth)
{
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
result.Hour = NextValue(hoursSet, 0);
result.DayOfMonth = DetermineDayOfMonth(spec, after, result);
}
if (result.Month == -1)
{
result.Month = NextValue(monthsSet, 0);
after.AddYears(1);
}
// Perform a last valid date check, if failing, try to compute a new date based on this altered after date
int year = after.Year;
if (!CheckDayValidInMonth(timeZone, result.DayOfMonth, result.Month, year))
{
afterTimeInMillis = after.TimeInMillis;
continue;
}
return(GetTime(result, after.Year, spec.OptionalTimeZone, timeZone));
}
}
/// <summary>
/// Determine the next valid day of month based on the given specification of valid days in month and
/// valid days in week. If both days in week and days in month are supplied, the days are OR-ed.
/// </summary>
/// <param name="spec"></param>
/// <param name="after"></param>
/// <param name="result"></param>
/// <returns></returns>
private static int DetermineDayOfMonth(ScheduleSpec spec, DateTimeEx after, ScheduleCalendar result)
{
ICollection <Int32> daysOfMonthSet = spec.UnitValues.Get(ScheduleUnit.DAYS_OF_MONTH);
ICollection <Int32> daysOfWeekSet = spec.UnitValues.Get(ScheduleUnit.DAYS_OF_WEEK);
ICollection <Int32> secondsSet = spec.UnitValues.Get(ScheduleUnit.SECONDS);
ICollection <Int32> minutesSet = spec.UnitValues.Get(ScheduleUnit.MINUTES);
ICollection <Int32> hoursSet = spec.UnitValues.Get(ScheduleUnit.HOURS);
int dayOfMonth;
// If days of week is a wildcard, just go by days of month
if (spec.OptionalDayOfMonthOperator != null || spec.OptionalDayOfWeekOperator != null)
{
var isWeek = false;
var op = spec.OptionalDayOfMonthOperator;
if (spec.OptionalDayOfMonthOperator == null)
{
op = spec.OptionalDayOfWeekOperator;
isWeek = true;
}
// may return the current day or a future day in the same month,
// and may advance the "after" date to the next month
int currentYYMMDD = GetTimeYYYYMMDD(after);
IncreaseAfterDayOfMonthSpecialOp(op.Operator, op.Day, op.Month, isWeek, after);
int rolledYYMMDD = GetTimeYYYYMMDD(after);
// if rolled then reset time portion
if (rolledYYMMDD > currentYYMMDD)
{
result.Second = (NextValue(secondsSet, 0));
result.Minute = (NextValue(minutesSet, 0));
result.Hour = (NextValue(hoursSet, 0));
return(after.GetFieldValue(DateTimeFieldEnum.DAY_OF_MONTH));
}
// rolling backwards is not allowed
else if (rolledYYMMDD < currentYYMMDD)
{
throw new IllegalStateException("Failed to evaluate special date op, rolled date less then current date");
}
else
{
var work = new DateTimeEx(after);
work.SetFieldValue(DateTimeFieldEnum.SECOND, result.Second);
work.SetFieldValue(DateTimeFieldEnum.MINUTE, result.Minute);
work.SetFieldValue(DateTimeFieldEnum.HOUR_OF_DAY, result.Hour);
if (work <= after)
{ // new date is not after current date, so bump
after.AddUsingField(DateTimeFieldEnum.DAY_OF_MONTH, 1);
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
result.Hour = NextValue(hoursSet, 0);
IncreaseAfterDayOfMonthSpecialOp(op.Operator, op.Day, op.Month, isWeek, after);
}
return(after.GetFieldValue(DateTimeFieldEnum.DAY_OF_MONTH));
}
}
else if (daysOfWeekSet == null)
{
dayOfMonth = NextValue(daysOfMonthSet, after.Day);
if (dayOfMonth != after.Day)
{
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
result.Hour = NextValue(hoursSet, 0);
}
if (dayOfMonth == -1)
{
dayOfMonth = NextValue(daysOfMonthSet, 0);
after.AddMonths(1, DateTimeMathStyle.Java);
}
}
// If days of weeks is not a wildcard and days of month is a wildcard, go by days of week only
else if (daysOfMonthSet == null)
{
// Loop to find the next day of month that works for the specified day of week values
while (true)
{
dayOfMonth = after.Day;
int dayOfWeek = (int)after.DayOfWeek;
// TODO
//
// Check the DayOfWeek logic in this section. The former code reads something
// like the following:
//
// Calendar.Get(after, SupportClass.CalendarManager.DAY_OF_WEEK) - 1;
//
// Java calendars are one based which means that subtracting one makes them
// zero-based. CLR DateTimes are zero-based so there should be no need to
// tweak the dates to make this work.
// If the day matches neither the day of month nor the day of week
if (!daysOfWeekSet.Contains(dayOfWeek))
{
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
result.Hour = NextValue(hoursSet, 0);
after.AddDays(1, DateTimeMathStyle.Java);
}
else
{
break;
}
}
}
// Both days of weeks and days of month are not a wildcard
else
{
// Loop to find the next day of month that works for either day of month OR day of week
while (true)
{
dayOfMonth = after.Day;
int dayOfWeek = (int)after.DayOfWeek;
// TODO
//
// See my discussion above about day of week conversion
// If the day matches neither the day of month nor the day of week
if ((!daysOfWeekSet.Contains(dayOfWeek)) && (!daysOfMonthSet.Contains(dayOfMonth)))
{
result.Second = NextValue(secondsSet, 0);
result.Minute = NextValue(minutesSet, 0);
result.Hour = NextValue(hoursSet, 0);
after.AddDays(1, DateTimeMathStyle.Java);
}
else
{
break;
}
}
}
return(dayOfMonth);
}