/**
* Fetch upcoming vehicle arrivals at a stop. This is a rather convoluted process because all of
* the departure search functions currently assume the existence of a State and a routing context.
* It would be nice to have another function that gives all departures within a time window at a
* stop, being careful to get a mix of all patterns passing through that stop. In fact, such a
* function could replace the current boarding logic if we want to allow boarding more than one
* trip on the same route at once (return more than one state). The current implementation is a
* sketch and does not adequately
*/
public Collection<StopTimesInPattern> stopTimesForStop(Stop stop) {
List<StopTimesInPattern> ret = Lists.newArrayList();
RoutingRequest req = new RoutingRequest();
req.setRoutingContext(graph, (Vertex) null, (Vertex) null);
State state = new State(req);
for (TripPattern pattern : patternsForStop.get(stop)) {
StopTimesInPattern times = new StopTimesInPattern(pattern);
// Should actually be getUpdatedTimetable
Timetable table = pattern.scheduledTimetable;
// A Stop may occur more than once in a pattern, so iterate over all Stops.
int sidx = 0;
for (Stop currStop : table.pattern.stopPattern.stops) {
if (currStop != stop) continue;
for (ServiceDay sd : req.rctx.serviceDays) {
TripTimes tt = table.getNextTrip(state, sd, sidx, true);
if (tt != null) {
times.times.add(new TripTimeShort(tt, sidx, stop));
}
}
sidx++;
}
if (!times.times.isEmpty()) ret.add(times);
}
return ret;
}
/**
* Fetch upcoming vehicle departures from a stop. It goes though all patterns passing the stop for
* the previous, current and next service date. It uses a priority queue to keep track of the next
* departures. The queue is shared between all dates, as services from the previous service date
* can visit the stop later than the current service date's services. This happens eg. with
* sleeper trains.
*
* <p>TODO: Add frequency based trips
*
* @param stop Stop object to perform the search for
* @param startTime Start time for the search. Seconds from UNIX epoch
* @param timeRange Searches forward for timeRange seconds from startTime
* @param numberOfDepartures Number of departures to fetch per pattern
* @return
*/
public List<StopTimesInPattern> stopTimesForStop(
Stop stop, long startTime, int timeRange, int numberOfDepartures) {
if (startTime == 0) {
startTime = System.currentTimeMillis() / 1000;
}
List<StopTimesInPattern> ret = new ArrayList<>();
TimetableSnapshot snapshot = null;
if (graph.timetableSnapshotSource != null) {
snapshot = graph.timetableSnapshotSource.getTimetableSnapshot();
}
ServiceDate[] serviceDates = {
new ServiceDate().previous(), new ServiceDate(), new ServiceDate().next()
};
for (TripPattern pattern : patternsForStop.get(stop)) {
// Use the Lucene PriorityQueue, which has a fixed size
PriorityQueue<TripTimeShort> pq =
new PriorityQueue<TripTimeShort>(numberOfDepartures) {
@Override
protected boolean lessThan(TripTimeShort tripTimeShort, TripTimeShort t1) {
// Calculate exact timestamp
return (tripTimeShort.serviceDay + tripTimeShort.realtimeDeparture)
> (t1.serviceDay + t1.realtimeDeparture);
}
};
// Loop through all possible days
for (ServiceDate serviceDate : serviceDates) {
ServiceDay sd =
new ServiceDay(graph, serviceDate, calendarService, pattern.route.getAgency().getId());
Timetable tt;
if (snapshot != null) {
tt = snapshot.resolve(pattern, serviceDate);
} else {
tt = pattern.scheduledTimetable;
}
if (!tt.temporallyViable(sd, startTime, timeRange, true)) continue;
int secondsSinceMidnight = sd.secondsSinceMidnight(startTime);
int sidx = 0;
for (Stop currStop : pattern.stopPattern.stops) {
if (currStop == stop) {
for (TripTimes t : tt.tripTimes) {
if (!sd.serviceRunning(t.serviceCode)) continue;
if (t.getDepartureTime(sidx) != -1
&& t.getDepartureTime(sidx) >= secondsSinceMidnight) {
pq.insertWithOverflow(new TripTimeShort(t, sidx, stop, sd));
}
}
// TODO: This needs to be adapted after #1647 is merged
for (FrequencyEntry freq : tt.frequencyEntries) {
if (!sd.serviceRunning(freq.tripTimes.serviceCode)) continue;
int departureTime = freq.nextDepartureTime(sidx, secondsSinceMidnight);
if (departureTime == -1) continue;
int lastDeparture =
freq.endTime
+ freq.tripTimes.getArrivalTime(sidx)
- freq.tripTimes.getDepartureTime(0);
int i = 0;
while (departureTime <= lastDeparture && i < numberOfDepartures) {
pq.insertWithOverflow(
new TripTimeShort(freq.materialize(sidx, departureTime, true), sidx, stop, sd));
departureTime += freq.headway;
i++;
}
}
}
sidx++;
}
}
if (pq.size() != 0) {
StopTimesInPattern stopTimes = new StopTimesInPattern(pattern);
while (pq.size() != 0) {
stopTimes.times.add(0, pq.pop());
}
ret.add(stopTimes);
}
}
return ret;
}
