    001package org.cpsolver.coursett.criteria.placement;
    002
    003import java.util.HashMap;
    004import java.util.Map;
    005import java.util.Set;
    006
    007import org.cpsolver.coursett.model.Lecture;
    008import org.cpsolver.coursett.model.Placement;
    009import org.cpsolver.ifs.assignment.Assignment;
    010import org.cpsolver.ifs.util.Counter;
    011
    012
    013/**
    014 * Count number of past assignments of a value. Avoid repetition by penalizing
    015 * values that have been assigned too many times already.
    016 * <br>
    017 *
    018 * @version CourseTT 1.3 (University Course Timetabling)<br>
    019 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
    020 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    021 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    022 * <br>
    023 *          This library is free software; you can redistribute it and/or modify
    024 *          it under the terms of the GNU Lesser General Public License as
    025 *          published by the Free Software Foundation; either version 3 of the
    026 *          License, or (at your option) any later version. <br>
    027 * <br>
    028 *          This library is distributed in the hope that it will be useful, but
    029 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    030 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    031 *          Lesser General Public License for more details. <br>
    032 * <br>
    033 *          You should have received a copy of the GNU Lesser General Public
    034 *          License along with this library; if not see
    035 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    036 */
    037@Deprecated
    038public class AssignmentCount extends PlacementSelectionCriterion {
    039
    040    public AssignmentCount() {
    041        setValueUpdateType(ValueUpdateType.BeforeUnassignedAfterAssigned);
    042    }
    043
    044    @Override
    045    public String getPlacementSelectionWeightName() {
    046        return "Placement.NrAssignmentsWeight";
    047    }
    048
    049    @Override
    050    public double getValue(Assignment<Lecture, Placement> assignment, Placement value, Set<Placement> conflicts) {
    051        return ((AssignmentCountContext)getContext(assignment)).countAssignments(value);
    052    }
    053
    054    @Override
    055    public ValueContext createAssignmentContext(Assignment<Lecture, Placement> assignment) {
    056        return new AssignmentCountContext(assignment);
    057    }
    058
    059    public class AssignmentCountContext extends ValueContext {
    060        Map<Placement, Counter> iCounter = new HashMap<Placement, Counter>();
    061
    062        protected AssignmentCountContext(Assignment<Lecture, Placement> assignment) {
    063            super(assignment);
    064        }
    065
    066        @Override
    067        protected void assigned(Assignment<Lecture, Placement> assignment, Placement value) {
    068            Counter c = iCounter.get(value);
    069            if (c == null) {
    070                c = new Counter();
    071                iCounter.put(value, c);
    072            }
    073            c.inc(1);
    074        }
    075
    076        @Override
    077        protected void unassigned(Assignment<Lecture, Placement> assignment, Placement value) {
    078        }
    079
    080        public long countAssignments(Placement value) {
    081            Counter c = iCounter.get(value);
    082            return c == null ? 0 : c.get();
    083        }
    084    }
    085}