CountRoadInDis.java

/* This program is free software: you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public License
 as published by the Free Software Foundation, either version 3 of
 the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

package org.opentripplanner.graph_builder.impl.stopsAlerts;

import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.operation.distance.DistanceOp;
import lombok.Setter;
import org.opentripplanner.common.geometry.DistanceLibrary;
import org.opentripplanner.common.geometry.SphericalDistanceLibrary;
import org.opentripplanner.routing.core.TraverseMode;
import org.opentripplanner.routing.edgetype.StreetEdge;
import org.opentripplanner.routing.edgetype.StreetTraversalPermission;
import org.opentripplanner.routing.graph.Graph;
import org.opentripplanner.routing.impl.StreetVertexIndexServiceImpl;
import org.opentripplanner.routing.services.StreetVertexIndexService;
import org.opentripplanner.routing.vertextype.TransitStop;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collection;



public class CountRoadInDis extends AbstractStopTester {

    Logger LOG = LoggerFactory.getLogger(CountRoadInDis.class);

    @Setter
    double distance; //distance in meters

    @Setter
    int numberOfStreets;

    @Setter
    StreetTraversalPermission allowedPermission;

    GeometryFactory geometryFactory = new GeometryFactory();


    /**
     * @retrun return true if the number of streets around a stop is equal or higher then numberOfStreets,
     * street consider to be around stop if the distance between then is less then distance.
     * please note that the distance calculation is big approximation, but it still good enough for the alerts need.
     */
    @Override
    public boolean fulfillDemands(TransitStop ts, Graph graph) {
        if(graph.streetIndex == null){
            graph.streetIndex = new StreetVertexIndexServiceImpl(graph);
            LOG.debug("street index built.");
        }
        StreetVertexIndexService streetIndexService = graph.streetIndex;
        DistanceLibrary distanceLibrary;
        if(streetIndexService instanceof  StreetVertexIndexServiceImpl) {
            distanceLibrary = ((StreetVertexIndexServiceImpl)streetIndexService).getDistanceLibrary();
        }else{
            distanceLibrary = SphericalDistanceLibrary.getInstance();
        }
        Envelope env = new Envelope(ts.getCoordinate());
        double rInMeters;
        if(distanceLibrary instanceof  SphericalDistanceLibrary){
            rInMeters = ((SphericalDistanceLibrary)distanceLibrary).RADIUS_OF_EARTH_IN_M;
        }else{
            rInMeters = 6371.01 * 1000;
        }
        double degForOneMeter = (Math.PI/(180*rInMeters));
        double disInDeg = degForOneMeter * distance;
        env.expandBy(disInDeg);
        Collection<StreetEdge> streetEdges = streetIndexService.getEdgesForEnvelope(env);

        int counter = 0;
        for(StreetEdge streetEdge: streetEdges){
            double dis = DistanceOp.distance(streetEdge.getGeometry(),geometryFactory.createPoint(ts.getCoordinate()));
            double disMeters =  (dis*Math.PI/180) * rInMeters;
            if (disMeters <= distance && streetEdge.getPermission().allows(allowedPermission)){
                counter++;
            }
        }

        if(counter >= numberOfStreets)
            return true;
        return false;
    }
}