001package org.cpsolver.coursett.preference;
002
003/**
004 * Min-max preference combination. <br>
005 * <ul>
006 * <li>If at least one preference is required &rarr; required
007 * <li>If at least one preference is prohibited &rarr; prohibited
008 * <li>If max&gt;-min &rarr; max
009 * <li>If -min&gt;max &rarr; min
010 * <li>Otherwise &rarr; 0
011 * </ul>
012 * 
013 * @author  Tomáš Müller
014 * @version CourseTT 1.3 (University Course Timetabling)<br>
015 *          Copyright (C) 2006 - 2014 Tomáš Müller<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 */
033public class MinMaxPreferenceCombination extends PreferenceCombination {
034    int iPreferenceMin = 0;
035    int iPreferenceMax = 0;
036    
037    public MinMaxPreferenceCombination() {}
038    
039    public MinMaxPreferenceCombination(MinMaxPreferenceCombination c) {
040        super(c);
041        iPreferenceMin = c.iPreferenceMin;
042        iPreferenceMax = c.iPreferenceMax;
043    }
044
045    @Override
046    public void addPreferenceInt(int intPref) {
047        super.addPreferenceInt(intPref);
048        iPreferenceMax = Math.max(iPreferenceMax, intPref);
049        iPreferenceMin = Math.min(iPreferenceMin, intPref);
050    }
051
052    @Override
053    public int getPreferenceInt() {
054        return (iPreferenceMax > -iPreferenceMin ? iPreferenceMax : -iPreferenceMin > iPreferenceMax ? iPreferenceMin
055                : iPreferenceMax);
056    }
057    
058    @Override
059    public PreferenceCombination clonePreferenceCombination() { return new MinMaxPreferenceCombination(this); }
060}