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The OpenTripPlanner multimodal journey planning system

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package org.opentripplanner.ext.legacygraphqlapi.datafetchers;

import graphql.relay.Relay;
import graphql.schema.DataFetcher;
import graphql.schema.DataFetchingEnvironment;
import org.locationtech.jts.geom.LineString;
import org.opentripplanner.ext.legacygraphqlapi.LegacyGraphQLRequestContext;
import org.opentripplanner.ext.legacygraphqlapi.generated.LegacyGraphQLDataFetchers;
import org.opentripplanner.ext.legacygraphqlapi.generated.LegacyGraphQLTypes;
import org.opentripplanner.model.Route;
import org.opentripplanner.model.Stop;
import org.opentripplanner.model.Timetable;
import org.opentripplanner.model.Trip;
import org.opentripplanner.model.TripPattern;
import org.opentripplanner.model.TripTimeShort;
import org.opentripplanner.model.calendar.ServiceDate;
import org.opentripplanner.routing.RoutingService;
import org.opentripplanner.routing.alertpatch.TransitAlert;
import org.opentripplanner.routing.core.ServiceDay;
import org.opentripplanner.routing.trippattern.TripTimes;
import org.opentripplanner.util.PolylineEncoder;
import org.opentripplanner.util.model.EncodedPolylineBean;

import java.text.ParseException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class LegacyGraphQLTripImpl implements LegacyGraphQLDataFetchers.LegacyGraphQLTrip {

  @Override
  public DataFetcher id() {
    return environment -> new Relay.ResolvedGlobalId("Trip",
        getSource(environment).getId().toString());
  }

  @Override
  public DataFetcher gtfsId() {
    return environment -> getSource(environment).getId().toString();
  }

  @Override
  public DataFetcher route() {
    return environment -> getSource(environment).getRoute();
  }

  @Override
  public DataFetcher serviceId() {
    return environment -> getSource(environment).getServiceId().toString();
  }

  @Override
  public DataFetcher> activeDates() {
    return environment -> getRoutingService(environment).getCalendarService()
        .getServiceDatesForServiceId(getSource(environment).getServiceId())
        .stream()
        .map(ServiceDate::asCompactString)
        .collect(Collectors.toList());
  }

  @Override
  public DataFetcher tripShortName() {
    return environment -> getSource(environment).getTripShortName();
  }

  @Override
  public DataFetcher tripHeadsign() {
    return environment -> getSource(environment).getTripHeadsign();
  }

  @Override
  public DataFetcher routeShortName() {
    return environment -> {
      Trip trip = getSource(environment);

      return trip.getRouteShortName() != null ? trip.getRouteShortName() : trip.getRoute().getShortName();
    };
  }

  @Override
  public DataFetcher directionId() {
    return environment -> getSource(environment).getDirectionId();
  }

  @Override
  public DataFetcher blockId() {
    return environment -> getSource(environment).getBlockId();
  }

  @Override
  public DataFetcher shapeId() {
    return environment -> getSource(environment).getShapeId().toString();
  }

  @Override
  public DataFetcher wheelchairAccessible() {
    return environment -> {
      switch (getSource(environment).getWheelchairAccessible()) {
        case 0: return "NO_INFORMATION";
        case 1: return "POSSIBLE";
        case 2: return "NOT_POSSIBLE";
        default: return null;
      }
    };
  }

  @Override
  public DataFetcher bikesAllowed() {
    return environment -> {
      switch (getSource(environment).getBikesAllowed()) {
        case 0: return "NO_INFORMATION";
        case 1: return "POSSIBLE";
        case 2: return "NOT_POSSIBLE";
        default: return null;
      }
    };
  }

  @Override
  public DataFetcher pattern() {
    return environment -> getRoutingService(environment)
        .getPatternForTrip()
        .get(getSource(environment));
  }

  @Override
  public DataFetcher> stops() {
    return environment -> getRoutingService(environment)
        .getPatternForTrip().get(getSource(environment))
        .getStops().stream()
        .map(Object.class::cast)
        .collect(Collectors.toList());
  }

  @Override
  public DataFetcher semanticHash() {
    return environment -> getRoutingService(environment)
        .getPatternForTrip()
        .get(getSource(environment))
        .semanticHashString(getSource(environment));
  }

  @Override
  public DataFetcher> stoptimes() {
    return environment -> TripTimeShort.fromTripTimes(
        getRoutingService(environment)
            .getPatternForTrip()
            .get(getSource(environment))
            .scheduledTimetable,
        getSource(environment));
  }

  @Override
  public DataFetcher departureStoptime() {
    return environment -> {
      try {
        RoutingService routingService = getRoutingService(environment);
        Trip trip = getSource(environment);
        Timetable timetable = getRoutingService(environment)
            .getPatternForTrip()
            .get(trip)
            .scheduledTimetable;

        TripTimes triptimes = timetable.getTripTimes(trip);
        ServiceDay serviceDate = null;

        var args = new LegacyGraphQLTypes.LegacyGraphQLTripDepartureStoptimeArgs(environment.getArguments());
        if (args.getLegacyGraphQLServiceDate() != null)
        new ServiceDay(
            routingService.getServiceCodes(),
            ServiceDate.parseString(args.getLegacyGraphQLServiceDate()),
            routingService.getCalendarService(),
            ((Trip) environment.getSource()).getRoute().getAgency().getId()
        );

        Stop stop = timetable.pattern.getStop(0);
        return new TripTimeShort(triptimes, 0, stop, serviceDate
        );
      } catch (ParseException e) {
        //Invalid date format
        return null;
      }
    };
  }

  @Override
  public DataFetcher arrivalStoptime() {
    return environment -> {
      try {
        RoutingService routingService = getRoutingService(environment);
        Trip trip = getSource(environment);
        Timetable timetable = getRoutingService(environment)
            .getPatternForTrip()
            .get(trip)
            .scheduledTimetable;

        TripTimes triptimes = timetable.getTripTimes(trip);
        ServiceDay serviceDate = null;

        var args = new LegacyGraphQLTypes.LegacyGraphQLTripArrivalStoptimeArgs(environment.getArguments());
        if (args.getLegacyGraphQLServiceDate() != null)
          new ServiceDay(
              routingService.getServiceCodes(),
              ServiceDate.parseString(args.getLegacyGraphQLServiceDate()),
              routingService.getCalendarService(),
              trip.getRoute().getAgency().getId()
          );

        Stop stop = timetable.pattern.getStop(triptimes.getNumStops() - 1);
        return new TripTimeShort(triptimes, triptimes.getNumStops() - 1, stop, serviceDate
        );
      } catch (ParseException e) {
        //Invalid date format
        return null;
      }
    };
  }

  @Override
  public DataFetcher> stoptimesForDate() {
    return environment -> {
      try {
        RoutingService routingService = getRoutingService(environment);
        Trip trip = getSource(environment);
        var args = new LegacyGraphQLTypes.LegacyGraphQLTripStoptimesForDateArgs(environment.getArguments());


        ServiceDate serviceDate = args.getLegacyGraphQLServiceDate() != null
            ? ServiceDate.parseString(args.getLegacyGraphQLServiceDate()) : new ServiceDate();

        ServiceDay serviceDay = new ServiceDay(
            routingService.getServiceCodes(),
            serviceDate,
            routingService.getCalendarService(),
            trip.getRoute().getAgency().getId()
        );

        //TODO: Pass serviceDate
        Timetable timetable = routingService.getTimetableForTripPattern(routingService.getPatternForTrip().get(trip));
        return TripTimeShort.fromTripTimes(timetable, trip, serviceDay);
      } catch (ParseException e) {
        return null; // Invalid date format
      }
    };
  }

  @Override
  public DataFetcher>> geometry() {
    return environment -> {
      LineString geometry = getRoutingService(environment).getPatternForTrip()
          .get(getSource(environment))
          .getGeometry();
      if (geometry == null) {
        return null;
      }
      return Arrays.stream(geometry.getCoordinateSequence().toCoordinateArray())
          .map(coordinate -> Arrays.asList(coordinate.x, coordinate.y))
          .collect(Collectors.toList());
    };
  }

  @Override
  public DataFetcher tripGeometry() {
    return environment -> {
      LineString geometry = getRoutingService(environment).getPatternForTrip()
          .get(getSource(environment))
          .getGeometry();
      if (geometry == null) {
        return null;
      }
      return PolylineEncoder.createEncodings(Arrays.asList(geometry.getCoordinates()));
    };
  }

  //TODO
  @Override
  public DataFetcher> alerts() {
    return environment -> List.of();
  }

  private RoutingService getRoutingService(DataFetchingEnvironment environment) {
    return environment.getContext().getRoutingService();
  }

  private Trip getSource(DataFetchingEnvironment environment) {
    return environment.getSource();
  }
}
 















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