001package org.cpsolver.coursett.criteria; 002 003import org.cpsolver.coursett.model.Lecture; 004import org.cpsolver.ifs.util.DataProperties; 005 006/** 007 * Student hard conflicts. This criterion counts student conflicts (either overlapping or 008 * distance) between classes. A hard conflict is a student conflict that happens between 009 * two classes that do not have alternatives (see {@link Lecture#isSingleSection()}). 010 * <br> 011 * 012 * @version CourseTT 1.3 (University Course Timetabling)<br> 013 * Copyright (C) 2006 - 2014 Tomáš Müller<br> 014 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br> 015 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br> 016 * <br> 017 * This library is free software; you can redistribute it and/or modify 018 * it under the terms of the GNU Lesser General Public License as 019 * published by the Free Software Foundation; either version 3 of the 020 * License, or (at your option) any later version. <br> 021 * <br> 022 * This library is distributed in the hope that it will be useful, but 023 * WITHOUT ANY WARRANTY; without even the implied warranty of 024 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 025 * Lesser General Public License for more details. <br> 026 * <br> 027 * You should have received a copy of the GNU Lesser General Public 028 * License along with this library; if not see 029 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>. 030 */ 031public class StudentHardConflict extends StudentConflict { 032 033 @Override 034 public boolean isApplicable(Lecture l1, Lecture l2) { 035 return l1 != null && l2 != null && !ignore(l1, l2) && hard(l1, l2); // only hard student conflicts, but including committed 036 } 037 038 @Override 039 public double getWeightDefault(DataProperties config) { 040 return config.getPropertyDouble("Comparator.HardStudentConflictWeight", 5.0); 041 } 042 043 @Override 044 public String getPlacementSelectionWeightName() { 045 return "Placement.NrHardStudConfsWeight"; 046 } 047}