1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
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 pseudo boolean algorithms described in:
20 * A fast pseudo-Boolean constraint solver Chai, D.; Kuehlmann, A.
21 * Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
22 * Volume 24, Issue 3, March 2005 Page(s): 305 - 317
23 *
24 * and
25 * Heidi E. Dixon, 2004. Automating Pseudo-Boolean Inference within a DPLL
26 * Framework. Ph.D. Dissertation, University of Oregon.
27 *******************************************************************************/
28 package org.sat4j.pb.constraints.pb;
29
30 import java.math.BigInteger;
31
32 import org.sat4j.minisat.core.VarActivityListener;
33
34 public interface IConflict extends IDataStructurePB {
35
36 /**
37 * Effectue une resolution avec une contrainte PB. Met a jour le Conflict.
38 *
39 * @param cpb
40 * contrainte avec laquelle on va faire la resolution
41 * @param litImplied
42 * litteral devant etre resolu
43 * @param val
44 * TODO
45 * @return la mise a jour du degre
46 */
47 BigInteger resolve(PBConstr cpb, int litImplied, VarActivityListener val);
48
49 BigInteger slackConflict();
50
51 boolean isAssertive(int dl);
52
53 /**
54 * Reduction d'une contrainte On supprime un litteral non assigne
55 * prioritairement, vrai sinon. En aucun cas on ne supprime litImplied.
56 *
57 * @return mise a jour du degre
58 */
59 public BigInteger reduceInConstraint(WatchPb wpb,
60 final BigInteger[] coefsBis, final int indLitImplied,
61 final BigInteger degreeBis);
62
63 /**
64 * retourne le niveau de backtrack : c'est-?-dire le niveau le plus haut
65 * pour lequel la contrainte est assertive
66 *
67 * @param maxLevel
68 * le plus bas niveau pour lequel la contrainte est assertive
69 * @return the highest level (smaller int) for which the constraint is
70 * assertive.
71 */
72 public int getBacktrackLevel(int maxLevel);
73
74 public void updateSlack(int level);
75 public boolean slackIsCorrect(int decisionLevel);
76
77 }