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