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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.tsp.domain;

import org.optaplanner.core.api.domain.entity.PlanningEntity;
import org.optaplanner.core.api.domain.variable.PlanningVariable;
import org.optaplanner.core.api.domain.variable.PlanningVariableGraphType;
import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.tsp.domain.location.Location;
import org.optaplanner.examples.tsp.domain.solver.DomicileAngleVisitDifficultyWeightFactory;
import org.optaplanner.examples.tsp.domain.solver.DomicileDistanceStandstillStrengthWeightFactory;

import com.fasterxml.jackson.annotation.JsonIgnore;

@PlanningEntity(difficultyWeightFactoryClass = DomicileAngleVisitDifficultyWeightFactory.class)
public class Visit extends AbstractPersistable implements Standstill {

    private Location location;

    // Planning variables: changes during planning, between score calculations.
    private Standstill previousStandstill;

    public Visit() {
    }

    public Visit(long id, Location location) {
        super(id);
        this.location = location;
    }

    @Override
    public Location getLocation() {
        return location;
    }

    public void setLocation(Location location) {
        this.location = location;
    }

    @PlanningVariable(graphType = PlanningVariableGraphType.CHAINED,
            strengthWeightFactoryClass = DomicileDistanceStandstillStrengthWeightFactory.class)
    public Standstill getPreviousStandstill() {
        return previousStandstill;
    }

    public void setPreviousStandstill(Standstill previousStandstill) {
        this.previousStandstill = previousStandstill;
    }

    // ************************************************************************
    // Complex methods
    // ************************************************************************

    /**
     * @return a positive number, the distance multiplied by 1000 to avoid floating point arithmetic rounding errors
     */
    @JsonIgnore
    public long getDistanceFromPreviousStandstill() {
        if (previousStandstill == null) {
            return 0L;
        }
        return getDistanceFrom(previousStandstill);
    }

    /**
     * @param standstill never null
     * @return a positive number, the distance multiplied by 1000 to avoid floating point arithmetic rounding errors
     */
    @JsonIgnore
    public long getDistanceFrom(Standstill standstill) {
        return standstill.getLocation().getDistanceTo(location);
    }

    /**
     * @param standstill never null
     * @return a positive number, the distance multiplied by 1000 to avoid floating point arithmetic rounding errors
     */
    @Override
    public long getDistanceTo(Standstill standstill) {
        return location.getDistanceTo(standstill.getLocation());
    }

    @Override
    public String toString() {
        if (location.getName() == null) {
            return super.toString();
        }
        return location.getName();
    }

}