001    package net.sf.cpsolver.coursett.preference;
002    
003    /**
004     * Min-max preference combination. <br>
005     * <ul>
006     * <li>If at least one preference is required -> required
007     * <li>If at least one preference is prohibited -> prohibited
008     * <li>If max>-min -> max
009     * <li>If -min>max -> min
010     * <li>Otherwise -> 0
011     * </ul>
012     * 
013     * @version CourseTT 1.2 (University Course Timetabling)<br>
014     *          Copyright (C) 2006 - 2010 Tomas Muller<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     */
032    public class MinMaxPreferenceCombination extends PreferenceCombination {
033        int iPreferenceMin = 0;
034        int iPreferenceMax = 0;
035    
036        @Override
037        public void addPreferenceInt(int intPref) {
038            super.addPreferenceInt(intPref);
039            iPreferenceMax = Math.max(iPreferenceMax, intPref);
040            iPreferenceMin = Math.min(iPreferenceMin, intPref);
041        }
042    
043        @Override
044        public int getPreferenceInt() {
045            return (iPreferenceMax > -iPreferenceMin ? iPreferenceMax : -iPreferenceMin > iPreferenceMax ? iPreferenceMin
046                    : iPreferenceMax);
047        }
048    }