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