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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 2011 Red Hat, Inc. and/or its affiliates.
 *
 * 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.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.thoughtworks.xstream.annotations.XStreamAlias;

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

    private Location location;

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

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

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

    @PlanningVariable(valueRangeProviderRefs = { "domicileRange", "visitRange" },
            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
     */
    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
     */
    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();
    }

}