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A Java library for transforming Google Transit Feed Spec feeds
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/**
 * Copyright (C) 2011 Brian Ferris 
 *
 * 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.updates;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.onebusaway.collections.FactoryMap;
import org.onebusaway.gtfs.model.AgencyAndId;
import org.onebusaway.gtfs.model.Route;
import org.onebusaway.gtfs.model.Trip;
import org.onebusaway.gtfs.services.GtfsMutableRelationalDao;
import org.onebusaway.gtfs_transformer.services.EntityTransformStrategy;
import org.onebusaway.gtfs_transformer.services.GtfsTransformStrategy;
import org.onebusaway.gtfs_transformer.services.TransformContext;
import org.onebusaway.gtfs_transformer.updates.UpdateLibrary;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DeduplicateRoutesStrategy implements GtfsTransformStrategy {

    private static Logger _log = LoggerFactory.getLogger(org.onebusaway.gtfs_transformer.updates.DeduplicateServiceIdsStrategy.class);

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

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


        Map> routesById = new FactoryMap>(
                new ArrayList());

        for (Route route : dao.getAllRoutes()) {

            AgencyAndId aid = route.getId();
            String id = aid.getId();

            int index = id.indexOf('_');
            if (index == -1)
                continue;

            String commonId = id.substring(index + 1);
            AgencyAndId commonIdFull = new AgencyAndId(aid.getAgencyId(), commonId);
            routesById.get(commonIdFull).add(route);
        }

        for (Map.Entry> entry : routesById.entrySet()) {

            AgencyAndId routeId = entry.getKey();
            List routes = entry.getValue();

            if (routes.size() == 1)
                continue;

            // Remove the route with the old id
            Route route = routes.get(0);
            dao.removeEntity(route);

            // Add the route with the new id
            route.setId(routeId);
            dao.saveEntity(route);

            for (int i = 1; i < routes.size(); i++) {
                Route duplicateRoute = routes.get(i);
                dao.removeEntity(duplicateRoute);
                List trips = dao.getTripsForRoute(duplicateRoute);
                for (Trip trip : trips)
                    trip.setRoute(route);
            }
        }

        UpdateLibrary.clearDaoCache(dao);
    }
}