001package net.sf.cpsolver.coursett.criteria.additional; 002 003import java.util.Collection; 004import java.util.Map; 005 006import net.sf.cpsolver.coursett.constraint.JenrlConstraint; 007import net.sf.cpsolver.coursett.model.Lecture; 008import net.sf.cpsolver.coursett.model.Student; 009import net.sf.cpsolver.ifs.util.DataProperties; 010 011/** 012 * Instructor student conflicts. This criterion penalizes cases when an instructor (of a class) is attending some 013 * other class as a student and there is a conflict between the two classes. Also, there is no alternative for the 014 * student class (the conflict cannot be sectioned away). 015 * <br> 016 * To enable instructor student conflicts, set solver parameter Global.LoadStudentInstructorConflicts to true. Also 017 * student course requests should be used in this case (to be able to match an instructor external id to a student 018 * external id). 019 * <br> 020 * Hard instructor student conflicts are weighted by Comparator.InstructorHardStudentConflictWeight. 021 * <br> 022 * 023 * @version CourseTT 1.2 (University Course Timetabling)<br> 024 * Copyright (C) 2006 - 2011 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 InstructorStudentHardConflict extends InstructorStudentConflict { 043 044 @Override 045 public boolean isApplicable(Lecture l1, Lecture l2) { 046 return super.isApplicable(l1, l2) && oneInstructorOtherHard(l1, l2); 047 } 048 049 /** 050 * One of the lectures is hard, there is a joint enrollment constraint between them, and 051 * there is at least one student that is instructor for one lecture and the other lecture 052 * is singleton. 053 */ 054 public static boolean oneInstructorOtherHard(Lecture l1, Lecture l2) { 055 if (!hard(l1, l2)) return false; 056 JenrlConstraint jenrl = l1.jenrlConstraint(l2); 057 if (jenrl == null) return false; 058 for (Student student: jenrl.getInstructors()) { 059 if ((l1.isSingleSection() || student.getInstructor().variables().contains(jenrl.second())) && 060 (l2.isSingleSection() || student.getInstructor().variables().contains(jenrl.first()))) 061 return true; 062 } 063 return false; 064 } 065 066 @Override 067 public double getWeightDefault(DataProperties config) { 068 return config.getPropertyDouble("Comparator.InstructorHardStudentConflictWeight", 10.0 * config.getPropertyDouble("Comparator.HardStudentConflictWeight", 5.0)); 069 } 070 071 @Override 072 public String getPlacementSelectionWeightName() { 073 return "Placement.NrInstructorHardStudConfsWeight"; 074 } 075 076 @Override 077 public void getInfo(Map<String, String> info) { 078 } 079 080 @Override 081 public void getInfo(Map<String, String> info, Collection<Lecture> variables) { 082 } 083 084}