001package net.sf.cpsolver.coursett.criteria.placement;
002
003import java.util.Set;
004
005import net.sf.cpsolver.coursett.model.Placement;
006
007/**
008 * Count number of past assignments of a value. Avoid repetition by penalizing
009 * values that have been assigned too many times already. 
010 * <br>
011 * 
012 * @version CourseTT 1.2 (University Course Timetabling)<br>
013 *          Copyright (C) 2006 - 2011 Tomáš Müller<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 */
031public class AssignmentCount extends PlacementSelectionCriterion {
032    
033    @Override
034    public String getPlacementSelectionWeightName() {
035        return "Placement.NrAssignmentsWeight";
036    }
037
038    @Override
039    public double getValue(Placement value, Set<Placement> conflicts) {
040        return value.countAssignments();
041    }
042}