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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.curriculumcourse.domain.solver;

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

import org.optaplanner.examples.curriculumcourse.domain.Course;

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

    private static final Comparator COURSE_COMPARATOR = Comparator.comparingLong(Course::getId);
    private static final Comparator COMPARATOR = Comparator
            .comparing(CourseConflict::getLeftCourse, COURSE_COMPARATOR)
            .thenComparing(CourseConflict::getRightCourse, COURSE_COMPARATOR);

    private final Course leftCourse;
    private final Course rightCourse;
    private final int conflictCount;

    public CourseConflict(Course leftCourse, Course rightCourse, int conflictCount) {
        this.leftCourse = leftCourse;
        this.rightCourse = rightCourse;
        this.conflictCount = conflictCount;
    }

    public Course getLeftCourse() {
        return leftCourse;
    }

    public Course getRightCourse() {
        return rightCourse;
    }

    public int getConflictCount() {
        return conflictCount;
    }

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

    @Override
    public int hashCode() {
        return Objects.hash(leftCourse, rightCourse);
    }

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

    @Override
    public String toString() {
        return leftCourse + " & " + rightCourse;
    }
}