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A Java library for transforming Google Transit Feed Spec feeds
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/**
 * Copyright (C) 2018 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.csv_entities.schema.annotations.CsvField;
import org.onebusaway.gtfs.model.AgencyAndId;
import org.onebusaway.gtfs.model.Stop;
import org.onebusaway.gtfs.services.GtfsMutableRelationalDao;
import org.onebusaway.gtfs_transformer.services.GtfsTransformStrategy;
import org.onebusaway.gtfs_transformer.services.TransformContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * using reference file add missing parent stops
 */
public class UpdateStopIdFromReferenceStrategy implements GtfsTransformStrategy {

    private final Logger _log = LoggerFactory.getLogger(UpdateStopIdFromReferenceStrategy.class);

    private static final int LOCATION_NAME_INDEX = 0;
    private static final int DIRECTION = 3;
    private static final int ATIS_ID_INDEX = 6;

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

    @Override
    public void run(TransformContext context, GtfsMutableRelationalDao dao) {
        GtfsMutableRelationalDao reference = (GtfsMutableRelationalDao) context.getReferenceReader().getEntityStore();

        //list of ids added to prevent duplicates
        ArrayList stopsAdded = new ArrayList();
        //list of stops to add
        ArrayList stopsToAdd = new ArrayList<>();

        HashMap referenceStops = new HashMap<>();
        for (Stop stop : reference.getAllStops()) {
            referenceStops.put(stop.getId().getId(), stop);
        }

        AgencyAndId agencyAndId = dao.getAllStops().iterator().next().getId();

        for (Stop stop: dao.getAllStops()) {
            String parentStation = stop.getParentStation();
            if (parentStation != null) {
                Stop existingStop = dao.getStopForId(new AgencyAndId(agencyAndId.getAgencyId(), parentStation));
                if (existingStop == null && !stopsAdded.contains(referenceStops.get(parentStation).getId())) {
                    Stop stopToAdd = new Stop();
                    stopToAdd.setId(referenceStops.get(parentStation).getId());
                    stopToAdd.setName(referenceStops.get(parentStation).getName());
                    stopToAdd.setLat(referenceStops.get(parentStation).getLat());
                    stopToAdd.setLon(referenceStops.get(parentStation).getLon());
                    stopToAdd.setLocationType(referenceStops.get(parentStation).getLocationType());
                    stopsAdded.add(referenceStops.get(parentStation).getId());
                    stopsToAdd.add(stopToAdd);
                }
            }
        }
        for (Stop stop : stopsToAdd) {
            dao.saveOrUpdateEntity(stop);
            _log.info("updating stops {}", stop.getId());
        }
    }
}