001    package net.sf.cpsolver.coursett.criteria.additional;
002    
003    
004    import net.sf.cpsolver.coursett.criteria.StudentHardConflict;
005    import net.sf.cpsolver.coursett.model.Lecture;
006    import net.sf.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     * @version CourseTT 1.2 (University Course Timetabling)<br>
015     *          Copyright (C) 2006 - 2011 Tomas Muller<br>
016     *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
017     *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
018     * <br>
019     *          This library is free software; you can redistribute it and/or modify
020     *          it under the terms of the GNU Lesser General Public License as
021     *          published by the Free Software Foundation; either version 3 of the
022     *          License, or (at your option) any later version. <br>
023     * <br>
024     *          This library is distributed in the hope that it will be useful, but
025     *          WITHOUT ANY WARRANTY; without even the implied warranty of
026     *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
027     *          Lesser General Public License for more details. <br>
028     * <br>
029     *          You should have received a copy of the GNU Lesser General Public
030     *          License along with this library; if not see
031     *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
032     */
033    public class QuadraticStudentHardConflict extends QuadraticStudentConflict {
034    
035        @Override
036        public boolean isApplicable(Lecture l1, Lecture l2) {
037            return hard(l1, l2);
038        }
039    
040        @Override
041        public double getWeightDefault(DataProperties config) {
042            return config.getPropertyDouble("Comparator.HardStudentConflictWeight", 5.0);
043        }
044        
045        @Override
046        public String getPlacementSelectionWeightName() {
047            return "Placement.NrHardStudConfsWeight";
048        }
049    
050    }