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A Java library for transforming Google Transit Feed Spec feeds

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/**
 * Copyright (C) 2021 Cambridge Systematics, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onebusaway.gtfs_transformer.impl;

import org.onebusaway.gtfs.model.StopTime;
import org.onebusaway.gtfs.model.Trip;
import org.onebusaway.gtfs.services.GtfsMutableRelationalDao;
import org.onebusaway.gtfs_transformer.services.GtfsTransformStrategy;
import org.onebusaway.gtfs_transformer.services.TransformContext;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.List;
import java.util.TimeZone;

/**
 * Updates the trip headsign to follow "railroad convention", which is  to , e.g. 
 * "10:43a to New York Penn Station". 
 * 
 * We just add the time here--we assume the trip headsign is already present via the other transforms that manipulate this. 
 *
 *    **That means this transform should be run *after* those others**. 
 */
public class UpdateTripHeadsignRailRoadConvention implements GtfsTransformStrategy {

    @Override
    public String getName() {
        return this.getClass().getSimpleName();
    }

    @Override
    public void run(TransformContext context, GtfsMutableRelationalDao dao) {

        for (Trip trip : dao.getAllTrips()) {
            List stopTimes = dao.getStopTimesForTrip(trip);

            if (stopTimes != null && stopTimes.size() > 0) {
                String existingTripHeadsign = (trip.getTripHeadsign() != null) ? trip.getTripHeadsign() : trip.getRouteShortName();
            	
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(stopTimes.get(0).getDepartureTime() * 1000);
                calendar.setTimeZone(TimeZone.getTimeZone("UTC"));
                
                SimpleDateFormat sdf = new SimpleDateFormat("h:mm a");
                sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
                
                String newTripHeadsign = sdf.format(calendar.getTime()) + " to " + existingTripHeadsign;                   
                
                trip.setTripHeadsign(newTripHeadsign);                    
            }
        }
    }
}