    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 * @author  Tomáš Müller
    029 * @version ExamTT 1.3 (Examination Timetabling)<br>
    030 *          Copyright (C) 2008 - 2014 Tomáš Müller<br>
    031 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    032 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    033 * <br>
    034 *          This library is free software; you can redistribute it and/or modify
    035 *          it under the terms of the GNU Lesser General Public License as
    036 *          published by the Free Software Foundation; either version 3 of the
    037 *          License, or (at your option) any later version. <br>
    038 * <br>
    039 *          This library is distributed in the hope that it will be useful, but
    040 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    041 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    042 *          Lesser General Public License for more details. <br>
    043 * <br>
    044 *          You should have received a copy of the GNU Lesser General Public
    045 *          License along with this library; if not see
    046 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    047 */
    048public class InstructorMoreThan2ADayConflicts extends StudentMoreThan2ADayConflicts {
    049
    050    @Override
    051    public String getWeightName() {
    052        return "Exams.InstructorMoreThanTwoADayWeight";
    053    }
    054
    055    @Override
    056    public String getXmlWeightName() {
    057        return "instructorMoreThanTwoADayWeight";
    058    }
    059
    060    @Override
    061    public double getWeightDefault(DataProperties config) {
    062        return 100.0;
    063    }
    064
    065    @Override
    066    public double getValue(Assignment<Exam, ExamPlacement> assignment, ExamPlacement value, Set<ExamPlacement> conflicts) {
    067        Exam exam = value.variable();
    068        int penalty = 0;
    069        Map<ExamInstructor, Set<Exam>> instructors = ((ExamModel)getModel()).getInstructorsOfDay(assignment, value.getPeriod());
    070        for (ExamInstructor s : exam.getInstructors()) {
    071            Set<Exam> exams = instructors.get(s);
    072            if (exams == null || exams.size() < 2) continue;
    073            int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1);
    074            if (nrExams > 2)
    075                penalty++;
    076        }
    077        /*
    078        for (ExamInstructor s : exam.getInstructors()) {
    079            Set<Exam> exams = s.getExamsADay(assignment, value.getPeriod());
    080            int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1);
    081            if (nrExams > 2)
    082                penalty++;
    083        }
    084        */
    085        return penalty;
    086    }
    087
    088    @Override
    089    public double getValue(Assignment<Exam, ExamPlacement> assignment, Collection<Exam> variables) {
    090        int ret = 0;
    091        ExamModel m = (ExamModel)getModel();
    092        Set<Integer> days = new HashSet<Integer>();
    093        for (ExamPeriod p: m.getPeriods()) {
    094            if (days.add(p.getDay())) {
    095                Map<ExamInstructor, Set<Exam>> instructors = ((ExamModel)getModel()).getInstructorsOfDay(assignment, p);
    096                for (Set<Exam> exams: instructors.values()) {
    097                    int nrExams = exams.size();
    098                    if (nrExams > 2)
    099                        ret += nrExams - 2;
    100                }
    101            }
    102        }
    103        return ret;
    104    }
    105
    106    @Override
    107    public String getName() {
    108        return "Instructor More Than 2 A Day Conflicts";
    109    }
    110
    111    @Override
    112    public String toString(Assignment<Exam, ExamPlacement> assignment) {
    113        return "iM2D:" + sDoubleFormat.format(getValue(assignment));
    114    }
    115}