001package org.cpsolver.exam.criteria; 002 003import java.util.Map; 004import java.util.Set; 005 006import org.cpsolver.exam.model.Exam; 007import org.cpsolver.exam.model.ExamModel; 008import org.cpsolver.exam.model.ExamPeriod; 009import org.cpsolver.exam.model.ExamPlacement; 010import org.cpsolver.exam.model.ExamStudent; 011import org.cpsolver.ifs.assignment.Assignment; 012import org.cpsolver.ifs.util.DataProperties; 013 014 015/** 016 * Number of more than two exams a day student conflicts. I.e., when an 017 * exam is attended by a student student that attends two or more other 018 * exams at the same day. 019 * <br><br> 020 * More than two exams a day student conflict weight can be set by 021 * problem property Exams.MoreThanTwoADayWeight, or in the input 022 * xml file, property moreThanTwoADayWeight. 023 * 024 * <br> 025 * 026 * @version ExamTT 1.3 (Examination Timetabling)<br> 027 * Copyright (C) 2008 - 2014 Tomas Muller<br> 028 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br> 029 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br> 030 * <br> 031 * This library is free software; you can redistribute it and/or modify 032 * it under the terms of the GNU Lesser General Public License as 033 * published by the Free Software Foundation; either version 3 of the 034 * License, or (at your option) any later version. <br> 035 * <br> 036 * This library is distributed in the hope that it will be useful, but 037 * WITHOUT ANY WARRANTY; without even the implied warranty of 038 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 039 * Lesser General Public License for more details. <br> 040 * <br> 041 * You should have received a copy of the GNU Lesser General Public 042 * License along with this library; if not see 043 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>. 044 */ 045public class StudentMoreThan2ADayConflicts extends ExamCriterion { 046 047 @Override 048 public String getWeightName() { 049 return "Exams.MoreThanTwoADayWeight"; 050 } 051 052 @Override 053 public double getWeightDefault(DataProperties config) { 054 return 100.0; 055 } 056 057 @Override 058 public double getValue(Assignment<Exam, ExamPlacement> assignment, ExamPlacement value, Set<ExamPlacement> conflicts) { 059 Exam exam = value.variable(); 060 int penalty = 0; 061 ExamPeriod period = value.getPeriod(); 062 Map<ExamStudent, Set<Exam>> students = ((ExamModel)getModel()).getStudentsOfDay(assignment, period); 063 for (ExamStudent s : exam.getStudents()) { 064 Set<Exam> exams = students.get(s); 065 if (exams == null || exams.size() < 2) continue; 066 int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1); 067 if (nrExams > 2) 068 penalty++; 069 } 070 /* 071 for (ExamStudent s : exam.getStudents()) { 072 Set<Exam> exams = s.getExamsADay(assignment, period); 073 int nrExams = exams.size() + (exams.contains(exam) ? 0 : 1); 074 if (nrExams > 2) 075 penalty++; 076 } 077 */ 078 return penalty; 079 } 080 081 @Override 082 public String getName() { 083 return "More Than 2 A Day Conflicts"; 084 } 085 086 @Override 087 public String getXmlWeightName() { 088 return "moreThanTwoADayWeight"; 089 } 090 091 @Override 092 public void getInfo(Assignment<Exam, ExamPlacement> assignment, Map<String, String> info) { 093 if (getValue(assignment) != 0.0) 094 info.put(getName(), sDoubleFormat.format(getValue(assignment))); 095 } 096 097 @Override 098 public String toString(Assignment<Exam, ExamPlacement> assignment) { 099 return "M2D:" + sDoubleFormat.format(getValue(assignment)); 100 } 101}