    001package org.cpsolver.coursett.criteria.additional;
    002
    003
    004import org.cpsolver.coursett.criteria.StudentHardConflict;
    005import org.cpsolver.coursett.model.Lecture;
    006import org.cpsolver.ifs.util.DataProperties;
    007
    008/**
    009 * Quadratic student conflicts. Same as {@link StudentHardConflict}, however,
    010 * student joint enrollments are squared (1 conflict counts as 1, 2 as 4, 3 as 9, etc.).
    011 *
    012 * <br>
    013 *
    014 * @author  Tomáš Müller
    015 * @version CourseTT 1.3 (University Course Timetabling)<br>
    016 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
    017 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    018 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    019 * <br>
    020 *          This library is free software; you can redistribute it and/or modify
    021 *          it under the terms of the GNU Lesser General Public License as
    022 *          published by the Free Software Foundation; either version 3 of the
    023 *          License, or (at your option) any later version. <br>
    024 * <br>
    025 *          This library is distributed in the hope that it will be useful, but
    026 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    027 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    028 *          Lesser General Public License for more details. <br>
    029 * <br>
    030 *          You should have received a copy of the GNU Lesser General Public
    031 *          License along with this library; if not see
    032 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    033 */
    034public class QuadraticStudentHardConflict extends QuadraticStudentConflict {
    035
    036    @Override
    037    public boolean isApplicable(Lecture l1, Lecture l2) {
    038        return l1 != null && l2 != null && !ignore(l1, l2) && hard(l1, l2);
    039    }
    040
    041    @Override
    042    public double getWeightDefault(DataProperties config) {
    043        return config.getPropertyDouble("Comparator.HardStudentConflictWeight", 5.0);
    044    }
    045
    046    @Override
    047    public String getPlacementSelectionWeightName() {
    048        return "Placement.NrHardStudConfsWeight";
    049    }
    050
    051}