    001package org.cpsolver.coursett.criteria;
    002
    003import org.cpsolver.coursett.constraint.JenrlConstraint;
    004import org.cpsolver.coursett.model.Lecture;
    005import org.cpsolver.coursett.model.Placement;
    006import org.cpsolver.coursett.model.TimeLocation;
    007import org.cpsolver.ifs.util.DataProperties;
    008import org.cpsolver.ifs.util.DistanceMetric;
    009
    010/**
    011 * Student distance conflicts. This criterion counts student distance conflicts between classes.
    012 * A distance conflict occurs when two classes that are attended by the same student (or students)
    013 * are placed back-to-back in rooms that are too far a part. The combinations of classes
    014 * that share students are maintained by {@link JenrlConstraint}. The critical distance is measured
    015 * by {@link DistanceMetric#getDistanceInMinutes(Long, Double, Double, Long, Double, Double)} and compared
    016 * witch class break time {@link TimeLocation#getBreakTime()}.
    017 * <br>
    018 *
    019 * @author  Tomáš Müller
    020 * @version CourseTT 1.3 (University Course Timetabling)<br>
    021 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
    022 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    023 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    024 * <br>
    025 *          This library is free software; you can redistribute it and/or modify
    026 *          it under the terms of the GNU Lesser General Public License as
    027 *          published by the Free Software Foundation; either version 3 of the
    028 *          License, or (at your option) any later version. <br>
    029 * <br>
    030 *          This library is distributed in the hope that it will be useful, but
    031 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    032 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    033 *          Lesser General Public License for more details. <br>
    034 * <br>
    035 *          You should have received a copy of the GNU Lesser General Public
    036 *          License along with this library; if not see
    037 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    038 */
    039public class StudentDistanceConflict extends StudentConflict {
    040
    041    @Override
    042    public boolean inConflict(Placement p1, Placement p2) {
    043        return distance(getMetrics(), p1, p2);
    044    }
    045
    046    @Override
    047    public boolean isApplicable(Lecture l1, Lecture l2) {
    048        return l1 != null && l2 != null && !ignore(l1, l2) && applicable(l1, l2); // all student conflicts (including committed)
    049    }
    050
    051    @Override
    052    public double getWeightDefault(DataProperties config) {
    053        return config.getPropertyDouble("Comparator.DistStudentConflictWeight", 0.2);
    054    }
    055
    056    @Override
    057    public String getPlacementSelectionWeightName() {
    058        return "Placement.NrDistStudConfsWeight";
    059    }
    060
    061
    062}