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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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/*
 * Copyright 2012 JBoss Inc
 *
 * 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.optaplanner.examples.vehiclerouting.domain;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamInclude;
import org.optaplanner.core.api.domain.entity.PlanningEntity;
import org.optaplanner.core.api.domain.variable.CustomShadowVariable;
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.vehiclerouting.domain.solver.VehicleUpdatingVariableListener;
import org.optaplanner.examples.vehiclerouting.domain.solver.VrpCustomerDifficultyComparator;
import org.optaplanner.examples.vehiclerouting.domain.timewindowed.TimeWindowedCustomer;

@PlanningEntity(difficultyComparatorClass = VrpCustomerDifficultyComparator.class)
@XStreamAlias("VrpCustomer")
@XStreamInclude({
        TimeWindowedCustomer.class
})
public class Customer extends AbstractPersistable implements Standstill {

    protected Location location;
    protected int demand;

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

    // Shadow variables
    protected Customer nextCustomer;
    protected Vehicle vehicle;

    public Location getLocation() {
        return location;
    }

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

    public int getDemand() {
        return demand;
    }

    public void setDemand(int demand) {
        this.demand = demand;
    }

    @PlanningVariable(valueRangeProviderRefs = {"vehicleRange", "customerRange"},
            graphType = PlanningVariableGraphType.CHAINED)
    public Standstill getPreviousStandstill() {
        return previousStandstill;
    }

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

    public Customer getNextCustomer() {
        return nextCustomer;
    }

    public void setNextCustomer(Customer nextCustomer) {
        this.nextCustomer = nextCustomer;
    }

    @CustomShadowVariable(variableListenerClass = VehicleUpdatingVariableListener.class,
            sources = {@CustomShadowVariable.Source(variableName = "previousStandstill")})
    public Vehicle getVehicle() {
        return vehicle;
    }

    public void setVehicle(Vehicle vehicle) {
        this.vehicle = vehicle;
    }

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

    /**
     * @return a positive number, the distance multiplied by 1000 to avoid floating point arithmetic rounding errors
     */
    public int getDistanceToPreviousStandstill() {
        if (previousStandstill == null) {
            return 0;
        }
        return getDistanceTo(previousStandstill);
    }

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

    @Override
    public String toString() {
        return location + "(after " + (previousStandstill == null ? "null" : previousStandstill.getLocation()) + ")";
    }

}