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 package org.sat4j.minisat.learning;
26
27 import org.sat4j.minisat.core.Constr;
28 import org.sat4j.minisat.core.ILits;
29 import org.sat4j.minisat.core.LearningStrategy;
30 import org.sat4j.minisat.core.Solver;
31 import org.sat4j.minisat.core.VarActivityListener;
32
33 /**
34 * An abstract learning strategy.
35 *
36 * The Variable Activity Listener 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 daniel
42 *
43 * @param <L>
44 */
45 abstract class AbstractLearning<L extends ILits> implements LearningStrategy<L> {
46
47 private VarActivityListener val;
48
49 public void setVarActivityListener(VarActivityListener s) {
50 this.val = s;
51 }
52
53 public void setSolver(Solver<L> s) {
54 this.val = s;
55 }
56
57 public final void claBumpActivity(Constr reason) {
58 for (int i = 0; i < reason.size(); i++) {
59 int q = reason.get(i);
60 assert q > 1;
61 val.varBumpActivity(q);
62 }
63 }
64
65 public void init() {
66 }
67
68 }