001 package net.sf.cpsolver.exam.criteria.additional;
002
003 import java.util.Collection;
004 import java.util.Set;
005
006 import net.sf.cpsolver.exam.criteria.ExamCriterion;
007 import net.sf.cpsolver.exam.model.Exam;
008 import net.sf.cpsolver.exam.model.ExamPeriodPlacement;
009 import net.sf.cpsolver.exam.model.ExamPlacement;
010
011 /**
012 * Experimental criterion counting violations of periods assignments. If this
013 * criterion is enabled, any period can be assigned to an exam (not only those that are
014 * in the domain of the exam).
015 * <br><br>
016 * To enable assignment of prohibited periods, set parameter Exam.SoftPeriods to
017 * a weight that should be inferred by a prohibited period assignment.
018 *
019 * <br>
020 *
021 * @version ExamTT 1.2 (Examination Timetabling)<br>
022 * Copyright (C) 2008 - 2012 Tomas Muller<br>
023 * <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
024 * <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
025 * <br>
026 * This library is free software; you can redistribute it and/or modify
027 * it under the terms of the GNU Lesser General Public License as
028 * published by the Free Software Foundation; either version 3 of the
029 * License, or (at your option) any later version. <br>
030 * <br>
031 * This library is distributed in the hope that it will be useful, but
032 * WITHOUT ANY WARRANTY; without even the implied warranty of
033 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
034 * Lesser General Public License for more details. <br>
035 * <br>
036 * You should have received a copy of the GNU Lesser General Public
037 * License along with this library; if not see
038 * <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
039 */
040 public class PeriodViolation extends ExamCriterion {
041
042 @Override
043 public String getWeightName() {
044 return "Exam.SoftPeriods";
045 }
046
047 @Override
048 public String getXmlWeightName() {
049 return "softPeriods";
050 }
051
052 @Override
053 public double getValue(ExamPlacement value, Set<ExamPlacement> conflicts) {
054 return (value.getPeriodPlacement().getExamPenalty() == getWeight() || value.getPeriodPlacement().getPeriod().getPenalty() == getWeight() ? 1.0 : 0.0);
055 }
056
057 @Override
058 public double[] getBounds(Collection<Exam> variables) {
059 double[] bounds = new double[] { 0.0, 0.0 };
060 for (Exam exam : variables) {
061 if (!exam.getPeriodPlacements().isEmpty()) {
062 for (ExamPeriodPlacement periodPlacement : exam.getPeriodPlacements()) {
063 if (periodPlacement.getExamPenalty() == getWeight() || periodPlacement.getPeriod().getPenalty() == getWeight()) {
064 bounds[1] ++; break;
065 }
066 }
067 }
068 }
069 return bounds;
070 }
071
072 @Override
073 public String toString() {
074 return (getValue() <= 0.0 ? "" : "!P:" + sDoubleFormat.format(getValue()));
075 }
076
077 }