001    package net.sf.cpsolver.coursett.criteria;
002    
003    import net.sf.cpsolver.coursett.model.Lecture;
004    import net.sf.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 1.2 (University Course Timetabling)<br>
013     *          Copyright (C) 2006 - 2011 Tomas Muller<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     */
031    public class StudentHardConflict extends StudentConflict {
032            
033        @Override
034        public boolean isApplicable(Lecture l1, Lecture l2) {
035            return !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    }