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