001 package net.sf.cpsolver.exam.criteria;
002
003 import java.util.Map;
004 import java.util.Set;
005
006 import net.sf.cpsolver.exam.model.Exam;
007 import net.sf.cpsolver.exam.model.ExamPlacement;
008 import net.sf.cpsolver.exam.model.ExamStudent;
009 import net.sf.cpsolver.ifs.util.DataProperties;
010
011 /**
012 * Number of more than two exams a day student conflicts. I.e., when an
013 * exam is attended by a student student that attends two or more other
014 * exams at the same day.
015 * <br><br>
016 * More than two exams a day student conflict weight can be set by
017 * problem property Exams.MoreThanTwoADayWeight, or in the input
018 * xml file, property moreThanTwoADayWeight.
019 *
020 * <br>
021 *
022 * @version ExamTT 1.2 (Examination Timetabling)<br>
023 * Copyright (C) 2008 - 2012 Tomas Muller<br>
024 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
025 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
026 * <br>
027 * This library is free software; you can redistribute it and/or modify
028 * it under the terms of the GNU Lesser General Public License as
029 * published by the Free Software Foundation; either version 3 of the
030 * License, or (at your option) any later version. <br>
031 * <br>
032 * This library is distributed in the hope that it will be useful, but
033 * WITHOUT ANY WARRANTY; without even the implied warranty of
034 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
035 * Lesser General Public License for more details. <br>
036 * <br>
037 * You should have received a copy of the GNU Lesser General Public
038 * License along with this library; if not see
039 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
040 */
041 public class StudentMoreThan2ADayConflicts extends ExamCriterion {
042
043 @Override
044 public String getWeightName() {
045 return "Exams.MoreThanTwoADayWeight";
046 }
047
048 @Override
049 public double getWeightDefault(DataProperties config) {
050 return 100.0;
051 }
052
053 @Override
054 public double getValue(ExamPlacement value, Set<ExamPlacement> conflicts) {
055 Exam exam = value.variable();
056 int penalty = 0;
057 for (ExamStudent s : exam.getStudents()) {
058 Set<Exam> exams = s.getExamsADay(value.getPeriod());
059 int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1);
060 if (nrExams > 2)
061 penalty++;
062 }
063 return penalty;
064 }
065
066 @Override
067 public String getName() {
068 return "More Than 2 A Day Conflicts";
069 }
070
071 @Override
072 public String getXmlWeightName() {
073 return "moreThanTwoADayWeight";
074 }
075
076 @Override
077 public void getInfo(Map<String, String> info) {
078 if (getValue() != 0.0)
079 info.put(getName(), sDoubleFormat.format(getValue()));
080 }
081
082 @Override
083 public String toString() {
084 return "M2D:" + sDoubleFormat.format(getValue());
085 }
086 }