    001package net.sf.cpsolver.coursett.constraint;
    002
    003import java.util.Set;
    004
    005import net.sf.cpsolver.coursett.criteria.StudentConflict;
    006import net.sf.cpsolver.coursett.model.Lecture;
    007import net.sf.cpsolver.coursett.model.Placement;
    008import net.sf.cpsolver.ifs.model.Constraint;
    009
    010/**
    011 * Ignore student conflicts constraint. <br>
    012 * This constraint keeps track of classes between which student conflicts of any kind are to be ignored.
    013 * This constraint is used by {@link Lecture#isToIgnoreStudentConflictsWith(Lecture)} and translates to
    014 * {@link StudentConflict#ignore(Lecture, Lecture)} that is true when the two classes are connected by
    015 * this constraint.
    016 *
    017 * <br>
    018 *
    019 * @version CourseTT 1.2 (University Course Timetabling)<br>
    020 *          Copyright (C) 2013 Tomáš Müller<br>
    021 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    022 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    023 * <br>
    024 *          This library is free software; you can redistribute it and/or modify
    025 *          it under the terms of the GNU Lesser General Public License as
    026 *          published by the Free Software Foundation; either version 3 of the
    027 *          License, or (at your option) any later version. <br>
    028 * <br>
    029 *          This library is distributed in the hope that it will be useful, but
    030 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    031 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    032 *          Lesser General Public License for more details. <br>
    033 * <br>
    034 *          You should have received a copy of the GNU Lesser General Public
    035 *          License along with this library; if not see
    036 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    037 */
    038public class IgnoreStudentConflictsConstraint extends Constraint<Lecture, Placement> {
    039
    040    public static final String REFERENCE = "NO_CONFLICT";
    041
    042    @Override
    043    public void addVariable(Lecture variable) {
    044        super.addVariable(variable);
    045        variable.clearIgnoreStudentConflictsWithCache();
    046    }
    047
    048    @Override
    049    public void computeConflicts(Placement value, Set<Placement> conflicts) {
    050    }
    051
    052    @Override
    053    public boolean isHard() {
    054        return false;
    055    }
    056
    057}