MyEventAttendeesComparator.java

package MusicLandscape.util.comparators;

import MusicLandscape.entities.Event;

/**
 * This class represents the concept of comparison of two events by number of attendees.
 *
 * @author Jonas Altrock (ew20b126@technikum-wien.at)
 * @version 1
 * @since ExerciseSheet04
 */
public class MyEventAttendeesComparator extends MyEventComparator {
    /**
     * Compares two events by the number of attendees.
     * <p>
     * This comparator handles null arguments such that two null events are equal, and any null event is smaller
     * than any non-null event.
     *
     * @param e1 the one event to compare
     * @param e2 the other event to compare
     * @return a measure of the distance between e1 and e2 in the sense of the comparator
     */
    @Override
    public int compare(Event e1, Event e2) {
        if (e1 == null && e2 == null) {
            return 0;
        }
        if (e1 == null) {
            return -1;
        }
        if (e2 == null) {
            return 1;
        }
        return e1.getAttendees() - e2.getAttendees();
    }
}