001package org.cpsolver.studentsct.heuristics.studentord;
002
003import org.cpsolver.ifs.util.DataProperties;
004import org.cpsolver.studentsct.model.Student;
005
006/**
007 * Return the given set of students in an order of average number of choices of
008 * each student (students with more choices first), however, real student are
009 * before last-like students. By default, the order is reversed (students with
010 * less choices first).
011 * 
012 * @author  Tomáš Müller
013 * @version StudentSct 1.3 (Student Sectioning)<br>
014 *          Copyright (C) 2007 - 2014 Tomáš Müller<br>
015 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
016 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
017 * <br>
018 *          This library is free software; you can redistribute it and/or modify
019 *          it under the terms of the GNU Lesser General Public License as
020 *          published by the Free Software Foundation; either version 3 of the
021 *          License, or (at your option) any later version. <br>
022 * <br>
023 *          This library is distributed in the hope that it will be useful, but
024 *          WITHOUT ANY WARRANTY; without even the implied warranty of
025 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
026 *          Lesser General Public License for more details. <br>
027 * <br>
028 *          You should have received a copy of the GNU Lesser General Public
029 *          License along with this library; if not see
030 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
031 */
032public class StudentChoiceRealFirstOrder extends StudentChoiceOrder {
033
034    public StudentChoiceRealFirstOrder(DataProperties config) {
035        super(config);
036    }
037
038    public StudentChoiceRealFirstOrder() {
039        super(new DataProperties());
040        setReverse(true);
041    }
042
043    @Override
044    public int compare(Student s1, Student s2) {
045        if (s1.isDummy()) {
046            if (!s2.isDummy())
047                return 1;
048        } else if (s2.isDummy())
049            return -1;
050        return super.compare(s1, s2);
051    }
052
053}