001package org.cpsolver.studentsct.heuristics;
002
003import org.cpsolver.ifs.assignment.Assignment;
004import org.cpsolver.ifs.model.Value;
005import org.cpsolver.ifs.model.Variable;
006
007/**
008 * Simple interface providing an assignment check for the {@link EnrollmentSelection}.
009 * 
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 interface AssignmentCheck<V extends Variable<V, T>, T extends Value<V, T>> {
030    
031    /**
032     * Check whether the given conflict can be unassigned
033     * @param value value to be assigned
034     * @param conflict conflicting value
035     * @param assignment current assignment
036     * @return true if the conflict can be unassigned due to the given value
037     */
038    public boolean canUnassign(T value, T conflict, Assignment<V, T> assignment);
039
040}