1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
3 *
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
8 *
9 * Alternatively, the contents of this file may be used under the terms of
10 * either the GNU Lesser General Public License Version 2.1 or later (the
11 * "LGPL"), in which case the provisions of the LGPL are applicable instead
12 * of those above. If you wish to allow use of your version of this file only
13 * under the terms of the LGPL, and not to allow others to use your version of
14 * this file under the terms of the EPL, indicate your decision by deleting
15 * the provisions above and replace them with the notice and other provisions
16 * required by the LGPL. If you do not delete the provisions above, a recipient
17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *
19 * Based on the original MiniSat specification from:
20 *
21 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22 * Sixth International Conference on Theory and Applications of Satisfiability
23 * Testing, LNCS 2919, pp 502-518, 2003.
24 *
25 * See www.minisat.se for the original solver in C++.
26 *
27 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30 package org.sat4j.pb.constraints.pb;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.minisat.core.VarActivityListener;
35
36 public interface IConflict extends IDataStructurePB {
37
38 /**
39 * Effectue une resolution avec une contrainte PB. Met a jour le Conflict.
40 *
41 * @param cpb
42 * contrainte avec laquelle on va faire la resolution
43 * @param litImplied
44 * litteral devant etre resolu
45 * @param val
46 * TODO
47 * @return la mise a jour du degre
48 */
49 BigInteger resolve(PBConstr cpb, int litImplied, VarActivityListener val);
50
51 BigInteger slackConflict();
52
53 boolean isAssertive(int dl);
54
55 /**
56 * Reduction d'une contrainte On supprime un litteral non assigne
57 * prioritairement, vrai sinon. En aucun cas on ne supprime litImplied.
58 *
59 * @return mise a jour du degre
60 */
61 BigInteger reduceInConstraint(IWatchPb wpb, final BigInteger[] coefsBis,
62 final int indLitImplied, final BigInteger degreeBis);
63
64 /**
65 * retourne le niveau de backtrack : c'est-?-dire le niveau le plus haut
66 * pour lequel la contrainte est assertive
67 *
68 * @param maxLevel
69 * le plus bas niveau pour lequel la contrainte est assertive
70 * @return the highest level (smaller int) for which the constraint is
71 * assertive.
72 */
73 int getBacktrackLevel(int maxLevel);
74
75 void updateSlack(int level);
76
77 boolean slackIsCorrect(int decisionLevel);
78 }