    001package org.cpsolver.exam.criteria;
    002
    003import java.util.Collection;
    004import java.util.HashSet;
    005import java.util.Map;
    006import java.util.Set;
    007
    008import org.cpsolver.exam.model.Exam;
    009import org.cpsolver.exam.model.ExamInstructor;
    010import org.cpsolver.exam.model.ExamModel;
    011import org.cpsolver.exam.model.ExamPeriod;
    012import org.cpsolver.exam.model.ExamPlacement;
    013import org.cpsolver.ifs.assignment.Assignment;
    014import org.cpsolver.ifs.util.DataProperties;
    015
    016
    017/**
    018 * Number of more than two exams a day instructor conflicts. I.e., when an
    019 * exam is attended by an instructor student that attends two or more other
    020 * exams at the same day.
    021 * <br><br>
    022 * More than two exams a day instructor conflict weight can be set by
    023 * problem property Exams.InstructorMoreThanTwoADayWeight, or in the input
    024 * xml file, property instructorMoreThanTwoADayWeight.
    025 *
    026 * <br>
    027 *
    028 * @version ExamTT 1.3 (Examination Timetabling)<br>
    029 *          Copyright (C) 2008 - 2014 Tomáš Müller<br>
    030 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    031 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    032 * <br>
    033 *          This library is free software; you can redistribute it and/or modify
    034 *          it under the terms of the GNU Lesser General Public License as
    035 *          published by the Free Software Foundation; either version 3 of the
    036 *          License, or (at your option) any later version. <br>
    037 * <br>
    038 *          This library is distributed in the hope that it will be useful, but
    039 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    040 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    041 *          Lesser General Public License for more details. <br>
    042 * <br>
    043 *          You should have received a copy of the GNU Lesser General Public
    044 *          License along with this library; if not see
    045 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    046 */
    047public class InstructorMoreThan2ADayConflicts extends StudentMoreThan2ADayConflicts {
    048
    049    @Override
    050    public String getWeightName() {
    051        return "Exams.InstructorMoreThanTwoADayWeight";
    052    }
    053
    054    @Override
    055    public String getXmlWeightName() {
    056        return "instructorMoreThanTwoADayWeight";
    057    }
    058
    059    @Override
    060    public double getWeightDefault(DataProperties config) {
    061        return 100.0;
    062    }
    063
    064    @Override
    065    public double getValue(Assignment<Exam, ExamPlacement> assignment, ExamPlacement value, Set<ExamPlacement> conflicts) {
    066        Exam exam = value.variable();
    067        int penalty = 0;
    068        Map<ExamInstructor, Set<Exam>> instructors = ((ExamModel)getModel()).getInstructorsOfDay(assignment, value.getPeriod());
    069        for (ExamInstructor s : exam.getInstructors()) {
    070            Set<Exam> exams = instructors.get(s);
    071            if (exams == null || exams.size() < 2) continue;
    072            int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1);
    073            if (nrExams > 2)
    074                penalty++;
    075        }
    076        /*
    077        for (ExamInstructor s : exam.getInstructors()) {
    078            Set<Exam> exams = s.getExamsADay(assignment, value.getPeriod());
    079            int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1);
    080            if (nrExams > 2)
    081                penalty++;
    082        }
    083        */
    084        return penalty;
    085    }
    086
    087    @Override
    088    public double getValue(Assignment<Exam, ExamPlacement> assignment, Collection<Exam> variables) {
    089        int ret = 0;
    090        ExamModel m = (ExamModel)getModel();
    091        Set<Integer> days = new HashSet<Integer>();
    092        for (ExamPeriod p: m.getPeriods()) {
    093            if (days.add(p.getDay())) {
    094                Map<ExamInstructor, Set<Exam>> instructors = ((ExamModel)getModel()).getInstructorsOfDay(assignment, p);
    095                for (Set<Exam> exams: instructors.values()) {
    096                    int nrExams = exams.size();
    097                    if (nrExams > 2)
    098                        ret += nrExams - 2;
    099                }
    100            }
    101        }
    102        return ret;
    103    }
    104
    105    @Override
    106    public String getName() {
    107        return "Instructor More Than 2 A Day Conflicts";
    108    }
    109
    110    @Override
    111    public String toString(Assignment<Exam, ExamPlacement> assignment) {
    112        return "iM2D:" + sDoubleFormat.format(getValue(assignment));
    113    }
    114}