001package org.cpsolver.exam.criteria; 002 003import java.util.Collection; 004import java.util.Map; 005import java.util.Set; 006 007import org.cpsolver.exam.model.Exam; 008import org.cpsolver.exam.model.ExamPlacement; 009import org.cpsolver.exam.model.ExamStudent; 010import org.cpsolver.ifs.assignment.Assignment; 011 012 013/** 014 * Number of direct student conflicts caused by the fact that a student is 015 * not available. 016 * <br><br> 017 * Direct student conflict weight can be set by problem property 018 * Exams.DirectConflictWeight, or in the input xml file, property 019 * directConflictWeight. 020 * 021 * <br> 022 * 023 * @version ExamTT 1.3 (Examination Timetabling)<br> 024 * Copyright (C) 2008 - 2014 Tomáš Müller<br> 025 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br> 026 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br> 027 * <br> 028 * This library is free software; you can redistribute it and/or modify 029 * it under the terms of the GNU Lesser General Public License as 030 * published by the Free Software Foundation; either version 3 of the 031 * License, or (at your option) any later version. <br> 032 * <br> 033 * This library is distributed in the hope that it will be useful, but 034 * WITHOUT ANY WARRANTY; without even the implied warranty of 035 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 036 * Lesser General Public License for more details. <br> 037 * <br> 038 * You should have received a copy of the GNU Lesser General Public 039 * License along with this library; if not see 040 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>. 041 */ 042public class StudentNotAvailableConflicts extends StudentDirectConflicts { 043 044 @Override 045 public double getValue(Assignment<Exam, ExamPlacement> assignment, ExamPlacement value, Set<ExamPlacement> conflicts) { 046 Exam exam = value.variable(); 047 int penalty = 0; 048 for (ExamStudent s : exam.getStudents()) { 049 if (!s.isAvailable(value.getPeriod())) 050 penalty++; 051 } 052 return penalty; 053 } 054 055 @Override 056 public String getName() { 057 return "Not Available Conflicts"; 058 } 059 060 @Override 061 public void getInfo(Assignment<Exam, ExamPlacement> assignment, Map<String, String> info) { 062 } 063 064 @Override 065 public double getValue(Assignment<Exam, ExamPlacement> assignment, Collection<Exam> exams) { 066 double ret = 0; 067 for (Exam exam: exams) { 068 ExamPlacement placement = assignment.getValue(exam); 069 if (placement != null) ret += getValue(assignment, placement, null); 070 } 071 return ret; 072 } 073 074 @Override 075 public String toString(Assignment<Exam, ExamPlacement> assignment) { 076 return (getValue(assignment) <= 0.0 ? "" : "NA:" + sDoubleFormat.format(getValue(assignment))); 077 } 078 079}