    001package org.cpsolver.coursett.criteria;
    002
    003import org.cpsolver.coursett.model.Lecture;
    004import org.cpsolver.coursett.model.Placement;
    005import org.cpsolver.coursett.model.TimeLocation;
    006import org.cpsolver.ifs.util.DataProperties;
    007
    008/**
    009 * Student overlapping conflicts. This criterion counts student overlapping conflicts between classes.
    010 * An overlapping conflict occurs when two classes that are attended by the same student (or students)
    011 * are overlapping in time (i.e., {@link TimeLocation#hasIntersection(TimeLocation)} is true).
    012 * <br>
    013 *
    014 * @version CourseTT 1.3 (University Course Timetabling)<br>
    015 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
    016 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    017 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    018 * <br>
    019 *          This library is free software; you can redistribute it and/or modify
    020 *          it under the terms of the GNU Lesser General Public License as
    021 *          published by the Free Software Foundation; either version 3 of the
    022 *          License, or (at your option) any later version. <br>
    023 * <br>
    024 *          This library is distributed in the hope that it will be useful, but
    025 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    026 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    027 *          Lesser General Public License for more details. <br>
    028 * <br>
    029 *          You should have received a copy of the GNU Lesser General Public
    030 *          License along with this library; if not see
    031 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    032 */
    033public class StudentOverlapConflict extends StudentConflict {
    034
    035    @Override
    036    public boolean inConflict(Placement p1, Placement p2) {
    037        return overlaps(p1, p2);
    038    }
    039
    040    @Override
    041    public boolean isApplicable(Lecture l1, Lecture l2) {
    042        return l1 != null && l2 != null && !ignore(l1, l2) && applicable(l1, l2); // all student conflicts (including committed)
    043    }
    044
    045    @Override
    046    public double getWeightDefault(DataProperties config) {
    047        return config.getPropertyDouble("Comparator.StudentConflictWeight", 1.0);
    048    }
    049
    050    @Override
    051    public String getPlacementSelectionWeightName() {
    052        return "Placement.NrStudConfsWeight";
    053    }
    054}