1 /*
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2006 Daniel Le Berre
3 *
4 * Based on the original minisat specification from:
5 *
6 * An extensible SAT solver. Niklas E?n and Niklas S?rensson. Proceedings of the
7 * Sixth International Conference on Theory and Applications of Satisfiability
8 * Testing, LNCS 2919, pp 502-518, 2003.
9 *
10 * This library is free software; you can redistribute it and/or modify it under
11 * the terms of the GNU Lesser General Public License as published by the Free
12 * Software Foundation; either version 2.1 of the License, or (at your option)
13 * any later version.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
18 * details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 package org.sat4j.minisat.core;
27
28 /**
29 * This interface is to be implemented by the classes wanted to be notified of
30 * the falsification of a literal.
31 *
32 * @author leberre
33 */
34 public interface Propagatable {
35
36 /**
37 * Propagate the truth value of a literal in constraints in which that
38 * literal is falsified.
39 *
40 * @param s
41 * something able to perform unit propagation
42 * @param p
43 * the literal being propagated. Its negation must appear in the
44 * constraint.
45 * @return false iff an inconsistency (a contradiction) is detected.
46 */
47 boolean propagate(UnitPropagationListener s, int p);
48
49 }