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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.

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package org.optaplanner.examples.flightcrewscheduling.domain;

import java.util.Map;

import org.optaplanner.examples.common.domain.AbstractPersistable;

public class Airport extends AbstractPersistable implements Comparable {

    private String code; // IATA 3-letter code
    private String name;

    private double latitude;
    private double longitude;

    private Map taxiTimeInMinutesMap;

    public Airport() {
    }

    public Airport(long id, String code, String name, double latitude, double longitude) {
        super(id);
        this.code = code;
        this.name = name;
        this.latitude = latitude;
        this.longitude = longitude;
    }

    /**
     * @param other never null
     * @return null if no taxi connection
     */
    public Long getTaxiTimeInMinutesTo(Airport other) {
        return taxiTimeInMinutesMap.get(other);
    }

    public double getHaversineDistanceInKmTo(Airport other) {
        if (this == other) {
            return 0.0;
        }
        final int EARTH_RADIUS_IN_KM = 6371;
        final int TWICE_EARTH_RADIUS_IN_KM = 2 * EARTH_RADIUS_IN_KM;

        double latitudeInRads = Math.toRadians(latitude);
        double longitudeInRads = Math.toRadians(longitude);
        // Cartesian coordinates, normalized for a sphere of diameter 1.0
        double cartesianX = 0.5 * Math.cos(latitudeInRads) * Math.sin(longitudeInRads);
        double cartesianY = 0.5 * Math.cos(latitudeInRads) * Math.cos(longitudeInRads);
        double cartesianZ = 0.5 * Math.sin(latitudeInRads);

        double otherLatitudeInRads = Math.toRadians(other.latitude);
        double otherLongitudeInRads = Math.toRadians(other.longitude);
        // Cartesian coordinates, normalized for a sphere of diameter 1.0
        double otherCartesianX = 0.5 * Math.cos(otherLatitudeInRads) * Math.sin(otherLongitudeInRads);
        double otherCartesianY = 0.5 * Math.cos(otherLatitudeInRads) * Math.cos(otherLongitudeInRads);
        double otherCartesianZ = 0.5 * Math.sin(otherLatitudeInRads);

        // TODO cache the part above
        double dX = cartesianX - otherCartesianX;
        double dY = cartesianY - otherCartesianY;
        double dZ = cartesianZ - otherCartesianZ;
        double r = Math.sqrt((dX * dX) + (dY * dY) + (dZ * dZ));
        return TWICE_EARTH_RADIUS_IN_KM * Math.asin(r);
    }

    @Override
    public String toString() {
        return name;
    }

    // ************************************************************************
    // Simple getters and setters
    // ************************************************************************

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getLatitude() {
        return latitude;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }

    public double getLongitude() {
        return longitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    public Map getTaxiTimeInMinutesMap() {
        return taxiTimeInMinutesMap;
    }

    public void setTaxiTimeInMinutesMap(Map taxiTimeInMinutesMap) {
        this.taxiTimeInMinutesMap = taxiTimeInMinutesMap;
    }

    @Override
    public int compareTo(Airport o) {
        return code.compareTo(o.code);
    }
}