    001package net.sf.cpsolver.coursett.criteria.additional;
    002
    003import net.sf.cpsolver.coursett.constraint.JenrlConstraint;
    004import net.sf.cpsolver.coursett.criteria.StudentConflict;
    005import net.sf.cpsolver.coursett.model.Lecture;
    006import net.sf.cpsolver.coursett.model.Student;
    007import net.sf.cpsolver.ifs.util.DataProperties;
    008
    009/**
    010 * Quadratic student conflicts. Same as {@link StudentConflict}, however,
    011 * student joint enrollments are squared (1 conflict counts as 1, 2 as 4, 3 as 9, etc.).
    012 *
    013 * <br>
    014 *
    015 * @version CourseTT 1.2 (University Course Timetabling)<br>
    016 *          Copyright (C) 2006 - 2011 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 */
    034
    035public class QuadraticStudentConflict extends StudentConflict {
    036
    037    @Override
    038    public boolean isApplicable(Lecture l1, Lecture l2) {
    039        return applicable(l1, l2);
    040    }
    041
    042    @Override
    043    public double getWeightDefault(DataProperties config) {
    044        return config.getPropertyDouble("Comparator.StudentConflictWeight", 1.0);
    045    }
    046
    047    @Override
    048    public String getPlacementSelectionWeightName() {
    049        return "Placement.NrStudConfsWeight";
    050    }
    051
    052    @Override
    053    protected double jointEnrollment(JenrlConstraint jenrl) {
    054        return jenrl.jenrl() * jenrl.jenrl();
    055    }
    056
    057    @Override
    058    public void incJenrl(JenrlConstraint jenrl, double studentWeight, Double conflictPriority, Student student) {
    059        if (inConflict(jenrl.first().getAssignment(), jenrl.second().getAssignment())) {
    060            iValue += (jenrl.jenrl() * jenrl.jenrl()) - (jenrl.jenrl() - studentWeight) * (jenrl.jenrl() - studentWeight);
    061        }
    062    }
    063
    064}