    001package org.cpsolver.studentsct.check;
    002
    003import java.util.HashMap;
    004
    005import org.cpsolver.coursett.model.TimeLocation;
    006import org.cpsolver.ifs.assignment.Assignment;
    007import org.cpsolver.studentsct.StudentSectioningModel;
    008import org.cpsolver.studentsct.model.Enrollment;
    009import org.cpsolver.studentsct.model.Request;
    010import org.cpsolver.studentsct.model.SctAssignment;
    011import org.cpsolver.studentsct.model.Student;
    012
    013
    014/**
    015 * This class looks and reports cases when a student is enrolled into two
    016 * sections that are overlapping in time.
    017 *
    018 * <br>
    019 * <br>
    020 *
    021 * Usage: if (new OverlapCheck(model).check()) ...
    022 *
    023 * <br>
    024 * <br>
    025 *
    026 * @version StudentSct 1.3 (Student Sectioning)<br>
    027 *          Copyright (C) 2007 - 2014 Tomáš Müller<br>
    028 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    029 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    030 * <br>
    031 *          This library is free software; you can redistribute it and/or modify
    032 *          it under the terms of the GNU Lesser General Public License as
    033 *          published by the Free Software Foundation; either version 3 of the
    034 *          License, or (at your option) any later version. <br>
    035 * <br>
    036 *          This library is distributed in the hope that it will be useful, but
    037 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    038 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    039 *          Lesser General Public License for more details. <br>
    040 * <br>
    041 *          You should have received a copy of the GNU Lesser General Public
    042 *          License along with this library; if not see
    043 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    044 */
    045public class OverlapCheck {
    046    private static org.apache.log4j.Logger sLog = org.apache.log4j.Logger.getLogger(OverlapCheck.class);
    047    private StudentSectioningModel iModel;
    048
    049    /**
    050     * Constructor
    051     *
    052     * @param model
    053     *            student sectioning model
    054     */
    055    public OverlapCheck(StudentSectioningModel model) {
    056        iModel = model;
    057    }
    058
    059    /** Return student sectioning model
    060     * @return problem model
    061     **/
    062    public StudentSectioningModel getModel() {
    063        return iModel;
    064    }
    065
    066    /**
    067     * Check for overlapping sections that are attended by the same student
    068     * @param a current assignment
    069     * @return false, if there is such a case
    070     */
    071    public boolean check(Assignment<Request, Enrollment> a) {
    072        sLog.info("Checking for overlaps...");
    073        boolean ret = true;
    074        for (Student student : getModel().getStudents()) {
    075            HashMap<TimeLocation, SctAssignment> times = new HashMap<TimeLocation, SctAssignment>();
    076            for (Request request : student.getRequests()) {
    077                Enrollment enrollment = a.getValue(request);
    078                if (enrollment == null)
    079                    continue;
    080                for (SctAssignment assignment : enrollment.getAssignments()) {
    081                    if (assignment.getTime() == null)
    082                        continue;
    083                    for (TimeLocation time: times.keySet()) {
    084                        if (time.hasIntersection(assignment.getTime())) {
    085                            sLog.error("Student " + student + " assignment " + assignment + " overlaps with "
    086                                    + times.get(time));
    087                            ret = false;
    088                        }
    089                    }
    090                    times.put(assignment.getTime(), assignment);
    091                }
    092            }
    093        }
    094        return ret;
    095    }
    096
    097}