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}