001package org.cpsolver.studentsct.filter;
002
003import org.cpsolver.studentsct.model.Student;
004
005/**
006 * This student filter combines two given student filters with logical operation
007 * AND or OR.
008 * 
009 * @author  Tomáš Müller
010 * @version StudentSct 1.3 (Student Sectioning)<br>
011 *          Copyright (C) 2007 - 2014 Tomáš Müller<br>
012 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
013 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
014 * <br>
015 *          This library is free software; you can redistribute it and/or modify
016 *          it under the terms of the GNU Lesser General Public License as
017 *          published by the Free Software Foundation; either version 3 of the
018 *          License, or (at your option) any later version. <br>
019 * <br>
020 *          This library is distributed in the hope that it will be useful, but
021 *          WITHOUT ANY WARRANTY; without even the implied warranty of
022 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
023 *          Lesser General Public License for more details. <br>
024 * <br>
025 *          You should have received a copy of the GNU Lesser General Public
026 *          License along with this library; if not see
027 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
028 */
029public class CombinedStudentFilter implements StudentFilter {
030    /** AND */
031    public static final int OP_AND = 0;
032    /** OR */
033    public static final int OP_OR = 1;
034    private StudentFilter iFirst, iSecond;
035    private int iOp;
036
037    /**
038     * Constructor
039     * 
040     * @param first
041     *            first filter
042     * @param second
043     *            second filter
044     * @param op
045     *            logical operation (either {@link CombinedStudentFilter#OP_AND}
046     *            or {@link CombinedStudentFilter#OP_OR} )
047     */
048    public CombinedStudentFilter(StudentFilter first, StudentFilter second, int op) {
049        iFirst = first;
050        iSecond = second;
051        iOp = op;
052    }
053
054    /**
055     * A student is accepted if it is accepted by the first and/or the second
056     * filter
057     */
058    @Override
059    public boolean accept(Student student) {
060        switch (iOp) {
061            case OP_OR:
062                return iFirst.accept(student) || iSecond.accept(student);
063            case OP_AND:
064            default:
065                return iFirst.accept(student) && iSecond.accept(student);
066        }
067    }
068
069    @Override
070    public String getName() {
071        switch (iOp) {
072            case OP_OR:
073                return iFirst.getName() + " OR " + iSecond.getName();
074            case OP_AND:
075            default:
076                return iFirst.getName() + " AND " + iSecond.getName();
077        }
078    }
079}