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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.examination.domain.solver;

import java.util.Comparator;
import java.util.Objects;

import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.examination.domain.Topic;

/**
 * Calculated during initialization, not modified during score calculation.
 */
public class TopicConflict extends AbstractPersistable implements Comparable {

    private static final Comparator TOPIC_COMPARATOR = Comparator.comparingLong(Topic::getId);
    private static final Comparator COMPARATOR = Comparator
            .comparing(TopicConflict::getLeftTopic, TOPIC_COMPARATOR)
            .thenComparing(TopicConflict::getRightTopic, TOPIC_COMPARATOR);
    private Topic leftTopic;
    private Topic rightTopic;
    private int studentSize;

    public TopicConflict() {
    }

    public TopicConflict(long id, Topic leftTopic, Topic rightTopic, int studentSize) {
        super(id);
        this.leftTopic = leftTopic;
        this.rightTopic = rightTopic;
        this.studentSize = studentSize;
    }

    public Topic getLeftTopic() {
        return leftTopic;
    }

    public void setLeftTopic(Topic leftTopic) {
        this.leftTopic = leftTopic;
    }

    public Topic getRightTopic() {
        return rightTopic;
    }

    public void setRightTopic(Topic rightTopic) {
        this.rightTopic = rightTopic;
    }

    public int getStudentSize() {
        return studentSize;
    }

    public void setStudentSize(int studentSize) {
        this.studentSize = studentSize;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final TopicConflict other = (TopicConflict) o;
        return Objects.equals(leftTopic, other.leftTopic) &&
                Objects.equals(rightTopic, other.rightTopic);
    }

    @Override
    public int hashCode() {
        return Objects.hash(leftTopic, rightTopic);
    }

    @Override
    public int compareTo(TopicConflict other) {
        return COMPARATOR.compare(this, other);
    }

    @Override
    public String toString() {
        return leftTopic + " & " + rightTopic + " = " + studentSize;
    }
}