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.reader.csp;
26
27 import java.util.Map;
28
29 import org.sat4j.core.VecInt;
30 import org.sat4j.specs.ContradictionException;
31 import org.sat4j.specs.ISolver;
32 import org.sat4j.specs.IVec;
33 import org.sat4j.specs.IVecInt;
34
35 public class DirectEncoding implements Encoding {
36
37 private final IVecInt clause = new VecInt();
38
39 private static final Encoding instance = new DirectEncoding();
40
41 private DirectEncoding() {
42 // nothing here
43 }
44
45 public static Encoding instance() {
46 return instance;
47 }
48
49 public void onFinish(ISolver solver, IVec<Var> scope) {
50 }
51
52 public void onInit(ISolver solver, IVec<Var> scope) {
53 }
54
55 public void onNogood(ISolver solver, IVec<Var> scope,
56 Map<Evaluable, Integer> tuple) throws ContradictionException {
57 clause.clear();
58 Var v;
59 for (int i = 0; i < scope.size(); i++) {
60 v = scope.get(i);
61 clause.push(-v.translate(tuple.get(v)));
62 }
63 solver.addClause(clause);
64
65 }
66
67 public void onSupport(ISolver solver, IVec<Var> scope,
68 Map<Evaluable, Integer> tuple) {
69 }
70
71 }