    001package net.sf.cpsolver.coursett.criteria;
    002
    003import java.util.Collection;
    004import java.util.Set;
    005
    006import net.sf.cpsolver.coursett.Constants;
    007import net.sf.cpsolver.coursett.model.Lecture;
    008import net.sf.cpsolver.coursett.model.Placement;
    009
    010/**
    011 * Room violations. This criterion counts how many times a prohibited room is assigned
    012 * to a class in interactive timetabling.
    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 */
    034public class RoomViolations extends TimetablingCriterion {
    035
    036    protected boolean violation(Placement value) {
    037        int pref = value.getRoomPreference();
    038        return pref > Constants.sPreferenceLevelProhibited / 2;
    039    }
    040
    041    @Override
    042    public double getValue(Placement value, Set<Placement> conflicts) {
    043        if (value.variable().isCommitted()) return 0.0;
    044        double ret = (violation(value) ? 1.0 : 0.0);
    045        if (conflicts != null)
    046            for (Placement conflict: conflicts)
    047                ret -= (violation(conflict) ? 1.0 : 0.0);
    048        return ret;
    049    }
    050
    051    @Override
    052    public double[] getBounds() {
    053        return new double[] { getModel().variables().size(), 0.0 };
    054    }
    055
    056    @Override
    057    public double[] getBounds(Collection<Lecture> variables) {
    058        return new double[] { variables.size(), 0.0 };
    059    }
    060
    061}