public Date getNextAppointment(Date start, Date now) {
Interval appointment =
getNextAppointment(new Interval(now.getTime() - start.getTime(), Moment.MILLISECOND));
Date result;
if (appointment != null)
result = new Date(start.getTime() + appointment.getDuration(Moment.MILLISECOND));
else result = null;
return result;
}
public Interval getNextAppointment(Interval interval) {
Interval appointment = null;
Interval iter = interval.plus(new Interval());
Interval elapsed = new Interval();
for (AppointmentBlock appointmentBlock : appointmentBlocks) {
// How long is this appointment block?
Interval duration = appointmentBlock.getDuration();
// Now, figure out if our next appointment is in this block.
if (duration != null) {
// This means this appointment block has a discrete duration.
if (duration.shorterThan(iter)) {
// We'll still have some time left over after we zoom
// past this guy, so hang out. Nothing to do here.
} else {
if (duration.longerThan(iter)) {
// Look in this interval for an appointment. If we
// find any at all after our remaining time left,
// that's our guy.
appointment = appointmentBlock.getNextAppointmentAfter(iter);
if (appointment != null) {
// Sweet. We got our appointment. We're done here,
// and we'll break out of the loop at the bottom.
} else {
// This is weird, but OK. This happens when there's
// a "blank space" at the end of an interval past
// all the appointments. Comes from saying something
// like "every 15 minutes for 40 minutes", which
// would have a 10 minute "gap" after the first 2
// meetings.
}
} else {
// It's exactly the same length. We need to pass this on to
// the next appointment block, so we just do nothing here.
}
}
} else {
// This means "Forever". Ask this guy for the next appointment,
// and then break out. If we don't find it here, it doesn't
// exist.
appointment = appointmentBlock.getNextAppointmentAfter(iter);
break;
}
// If we've found our next appointment we're done, so break out.
if (appointment != null) break;
// If we're not done, "fast forward" past this appointment block.
iter = iter.minus(duration);
elapsed = elapsed.plus(duration);
// If we have no time left in our iterator, set ourselves to 0.
if (iter.getDuration() <= 0) iter = new Interval();
}
Interval result;
if (appointment != null) result = elapsed.plus(appointment);
else result = null;
return result;
}
