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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule engine powered score calculation. This is the drools-planner-examples module which contains examples on how to use Drools Planner.
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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.drools.planner.examples.examination.domain;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import org.apache.commons.lang.builder.CompareToBuilder;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.drools.planner.api.domain.entity.PlanningEntity;
import org.drools.planner.api.domain.variable.PlanningVariable;
import org.drools.planner.api.domain.variable.ValueRangeFromSolutionProperty;
import org.drools.planner.examples.common.domain.AbstractPersistable;
import org.drools.planner.examples.examination.domain.solver.ExamBefore;
import org.drools.planner.examples.examination.domain.solver.ExamCoincidence;

@PlanningEntity
@XStreamAlias("Exam")
public class Exam extends AbstractPersistable implements Comparable {

    private Topic topic;

    // Calculated during initialization, not used for score calculation, used for move creation.
    private ExamCoincidence examCoincidence = null;
    private ExamBefore examBefore = null;

    // Changed by moves, between score calculations.
    private Period period;
    private Room room;

    public Topic getTopic() {
        return topic;
    }

    public void setTopic(Topic topic) {
        this.topic = topic;
    }

    public ExamCoincidence getExamCoincidence() {
        return examCoincidence;
    }

    public void setExamCoincidence(ExamCoincidence examCoincidence) {
        this.examCoincidence = examCoincidence;
    }

    public ExamBefore getExamBefore() {
        return examBefore;
    }

    public void setExamBefore(ExamBefore examBefore) {
        this.examBefore = examBefore;
    }

    @PlanningVariable
    @ValueRangeFromSolutionProperty(propertyName = "periodList")
    public Period getPeriod() {
        return period;
    }

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

    @PlanningVariable
    @ValueRangeFromSolutionProperty(propertyName = "roomList")
    public Room getRoom() {
        return room;
    }

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

    public boolean isCoincidenceLeader() {
        return examCoincidence == null
                || examCoincidence.getFirstExam() == this;
    }

    public int compareTo(Exam other) {
        return new CompareToBuilder()
                .append(period, other.period)
                .append(room, other.room)
                .append(topic, other.topic)
                .toComparison();
    }

    public Exam clone() {
        Exam clone = new Exam();
        clone.id = id;
        clone.topic = topic;
        clone.period = period;
        clone.room = room;
        return clone;
    }

    /**
     * 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 Exam) {
            Exam other = (Exam) o;
            return new EqualsBuilder()
                    .append(id, other.id)
                    .append(topic, other.topic)
                    .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(topic)
                .append(period)
                .append(room)
                .toHashCode();
    }

    @Override
    public String toString() {
        return topic + " @ " + period + " + " + room;
    }

    public int getTopicDuration() {
        return getTopic().getDuration();
    }

    public int getTopicStudentSize() {
        return getTopic().getStudentSize();
    }

    public int getPeriodDuration() {
        return getPeriod().getDuration();
    }

}