org.optaplanner.examples.tsp.domain.location.RoadLocation Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of optaplanner-examples Show documentation

OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

There is a newer version: 9.44.0.Final

Show newest version

package org.optaplanner.examples.tsp.domain.location;

import java.util.Map;

import org.optaplanner.examples.common.persistence.jackson.KeySerializer;

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

/**
 * The cost between 2 locations was precalculated on a real road network route.
 * The cost itself might be the distance in km, the travel time, the fuel usage or a weighted function of any of those.
 * Used with {@link DistanceType#ROAD_DISTANCE}.
 */
public class RoadLocation extends Location {

    // Prefer Map over array or List because customers might be added and removed in real-time planning.
    protected Map travelDistanceMap;

    public RoadLocation() {
    }

    public RoadLocation(long id) {
        super(id);
    }

    public RoadLocation(long id, double latitude, double longitude) {
        super(id, latitude, longitude);
    }

    @JsonSerialize(keyUsing = KeySerializer.class)
    @JsonDeserialize(keyUsing = RoadLocationKeyDeserializer.class)
    public Map getTravelDistanceMap() {
        return travelDistanceMap;
    }

    public void setTravelDistanceMap(Map travelDistanceMap) {
        this.travelDistanceMap = travelDistanceMap;
    }

    @Override
    public long getDistanceTo(Location location) {
        if (this == location) {
            return 0L;
        }
        double distance = travelDistanceMap.get((RoadLocation) location);
        // Multiplied by 1000 to avoid floating point arithmetic rounding errors
        return (long) (distance * 1000.0 + 0.5);
    }

}