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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 2010 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.curriculumcourse.domain;

import java.util.List;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.optaplanner.core.api.domain.entity.PlanningEntity;
import org.optaplanner.core.api.domain.variable.PlanningVariable;
import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.curriculumcourse.domain.solver.LectureDifficultyWeightFactory;
import org.optaplanner.examples.curriculumcourse.domain.solver.PeriodStrengthWeightFactory;
import org.optaplanner.examples.curriculumcourse.domain.solver.RoomStrengthWeightFactory;

@PlanningEntity(difficultyWeightFactoryClass = LectureDifficultyWeightFactory.class)
@XStreamAlias("Lecture")
public class Lecture extends AbstractPersistable {

    private Course course;
    private int lectureIndexInCourse;

    // Planning variables: changes during planning, between score calculations.
    private Period period;
    private Room room;

    public Course getCourse() {
        return course;
    }

    public void setCourse(Course course) {
        this.course = course;
    }

    public int getLectureIndexInCourse() {
        return lectureIndexInCourse;
    }

    public void setLectureIndexInCourse(int lectureIndexInCourse) {
        this.lectureIndexInCourse = lectureIndexInCourse;
    }

    @PlanningVariable(valueRangeProviderRefs = {"periodRange"},
            strengthWeightFactoryClass = PeriodStrengthWeightFactory.class)
    public Period getPeriod() {
        return period;
    }

    public void setPeriod(Period period) {
        this.period = period;
    }

    @PlanningVariable(valueRangeProviderRefs = {"roomRange"},
            strengthWeightFactoryClass = RoomStrengthWeightFactory.class)
    public Room getRoom() {
        return room;
    }

    public void setRoom(Room room) {
        this.room = room;
    }

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

    public int getStudentSize() {
        return course.getStudentSize();
    }

    public List getCurriculumList() {
        return course.getCurriculumList();
    }

    public Day getDay() {
        if (period == null) {
            return null;
        }
        return period.getDay();
    }

    public int getTimeslotIndex() {
        if (period == null) {
            return Integer.MIN_VALUE;
        }
        return period.getTimeslot().getTimeslotIndex();
    }

    public String getLabel() {
        return course + "-" + lectureIndexInCourse;
    }

    /**
     * The normal methods {@link #equals(Object)} and {@link #hashCode()} cannot be used because the rule engine already
     * requires them (for performance in their original state).
     * @see #solutionHashCode()
     */
    public boolean solutionEquals(Object o) {
        if (this == o) {
            return true;
        } else if (o instanceof Lecture) {
            Lecture other = (Lecture) o;
            return new EqualsBuilder()
                    .append(id, other.id)
                    .append(course, other.course)
                    .append(period, other.period)
                    .append(room, other.room)
                    .isEquals();
        } else {
            return false;
        }
    }

    /**
     * The normal methods {@link #equals(Object)} and {@link #hashCode()} cannot be used because the rule engine already
     * requires them (for performance in their original state).
     * @see #solutionEquals(Object)
     */
    public int solutionHashCode() {
        return new HashCodeBuilder()
                .append(id)
                .append(course)
                .append(period)
                .append(room)
                .toHashCode();
    }

    @Override
    public String toString() {
        return course + "-" + lectureIndexInCourse + " @ " + period + " + " + room;
    }

}