    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}