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.learning;
27
28 import org.sat4j.minisat.core.Constr;
29 import org.sat4j.minisat.core.DataStructureFactory;
30 import org.sat4j.minisat.core.ILits;
31 import org.sat4j.minisat.core.Solver;
32
33 /**
34 * MiniSAT learning scheme.
35 *
36 * The Data Structure Factory is expected to be set thanks to the
37 * appropriate setter method before using it.
38 *
39 * It was not possible to set it in the constructor.
40 *
41 * @author leberre
42 */
43 public class MiniSATLearning<L extends ILits> extends AbstractLearning<L> {
44 private static final long serialVersionUID = 1L;
45
46 private DataStructureFactory<L> dsf;
47
48 public void setDataStructureFactory(DataStructureFactory<L> dsf) {
49 this.dsf = dsf;
50 }
51
52 @Override
53 public void setSolver(Solver<L> s) {
54 super.setSolver(s);
55 this.dsf = s.getDSFactory();
56 }
57
58 public void learns(Constr constr) {
59 // va contenir une nouvelle clause ou null si la clause est unitaire
60 claBumpActivity(constr);
61 dsf.learnConstraint(constr);
62 }
63
64 /* (non-Javadoc)
65 * @see java.lang.Object#toString()
66 */
67 @Override
68 public String toString() {
69 return "Learn all clauses as in MiniSAT";
70 }
71
72 }