001package net.sf.cpsolver.coursett.criteria.additional; 002 003import net.sf.cpsolver.coursett.constraint.JenrlConstraint; 004import net.sf.cpsolver.coursett.criteria.StudentConflict; 005import net.sf.cpsolver.coursett.model.Lecture; 006import net.sf.cpsolver.coursett.model.Student; 007import net.sf.cpsolver.ifs.util.DataProperties; 008 009/** 010 * Quadratic student conflicts. Same as {@link StudentConflict}, however, 011 * student joint enrollments are squared (1 conflict counts as 1, 2 as 4, 3 as 9, etc.). 012 * 013 * <br> 014 * 015 * @version CourseTT 1.2 (University Course Timetabling)<br> 016 * Copyright (C) 2006 - 2011 Tomáš Müller<br> 017 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br> 018 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br> 019 * <br> 020 * This library is free software; you can redistribute it and/or modify 021 * it under the terms of the GNU Lesser General Public License as 022 * published by the Free Software Foundation; either version 3 of the 023 * License, or (at your option) any later version. <br> 024 * <br> 025 * This library is distributed in the hope that it will be useful, but 026 * WITHOUT ANY WARRANTY; without even the implied warranty of 027 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 028 * Lesser General Public License for more details. <br> 029 * <br> 030 * You should have received a copy of the GNU Lesser General Public 031 * License along with this library; if not see 032 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>. 033 */ 034 035public class QuadraticStudentConflict extends StudentConflict { 036 037 @Override 038 public boolean isApplicable(Lecture l1, Lecture l2) { 039 return applicable(l1, l2); 040 } 041 042 @Override 043 public double getWeightDefault(DataProperties config) { 044 return config.getPropertyDouble("Comparator.StudentConflictWeight", 1.0); 045 } 046 047 @Override 048 public String getPlacementSelectionWeightName() { 049 return "Placement.NrStudConfsWeight"; 050 } 051 052 @Override 053 protected double jointEnrollment(JenrlConstraint jenrl) { 054 return jenrl.jenrl() * jenrl.jenrl(); 055 } 056 057 @Override 058 public void incJenrl(JenrlConstraint jenrl, double studentWeight, Double conflictPriority, Student student) { 059 if (inConflict(jenrl.first().getAssignment(), jenrl.second().getAssignment())) { 060 iValue += (jenrl.jenrl() * jenrl.jenrl()) - (jenrl.jenrl() - studentWeight) * (jenrl.jenrl() - studentWeight); 061 } 062 } 063 064}