Examples with ExamModel org.cpsolver.exam.model.ExamModel used on opensource projects

Example 21 with ExamModel

use of org.cpsolver.exam.model.ExamModel in project cpsolver by UniTime.

the class ExamRandomMove method selectNeighbour.

/**
     * Select an exam randomly, select an available period randomly (from
     * {@link Exam#getPeriodPlacements()}), select rooms using
     * {@link Exam#findBestAvailableRooms(Assignment, ExamPeriodPlacement)}.
     */
@Override
public Neighbour<Exam, ExamPlacement> selectNeighbour(Solution<Exam, ExamPlacement> solution) {
    ExamModel model = (ExamModel) solution.getModel();
    Assignment<Exam, ExamPlacement> assignment = solution.getAssignment();
    Exam exam = ToolBox.random(model.variables());
    int px = ToolBox.random(exam.getPeriodPlacements().size());
    for (int p = 0; p < exam.getPeriodPlacements().size(); p++) {
        ExamPeriodPlacement period = exam.getPeriodPlacements().get((p + px) % exam.getPeriodPlacements().size());
        if (iCheckStudentConflicts && exam.countStudentConflicts(assignment, period) > 0)
            continue;
        if (iCheckDistributionConstraints && !exam.checkDistributionConstraints(assignment, period))
            continue;
        Set<ExamRoomPlacement> rooms = exam.findBestAvailableRooms(assignment, period);
        if (rooms == null)
            continue;
        return new ExamSimpleNeighbour(assignment, new ExamPlacement(exam, period, rooms));
    }
    return null;
}