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
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17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *******************************************************************************/
19 package org.sat4j.csp.encodings;
20
21 import java.util.Map;
22
23 import org.sat4j.core.VecInt;
24 import org.sat4j.csp.Encoding;
25 import org.sat4j.csp.Evaluable;
26 import org.sat4j.csp.Var;
27 import org.sat4j.specs.ContradictionException;
28 import org.sat4j.specs.ISolver;
29 import org.sat4j.specs.IVec;
30 import org.sat4j.specs.IVecInt;
31
32 public class DirectEncoding implements Encoding {
33
34 private final IVecInt clause = new VecInt();
35
36 private static final Encoding instance = new DirectEncoding();
37
38 private DirectEncoding() {
39 // nothing here
40 }
41
42 public static Encoding instance() {
43 return instance;
44 }
45
46 public void onFinish(ISolver solver, IVec<Var> scope) {
47 }
48
49 public void onInit(ISolver solver, IVec<Var> scope) {
50 }
51
52 public void onNogood(ISolver solver, IVec<Var> scope,
53 Map<Evaluable, Integer> tuple) throws ContradictionException {
54 clause.clear();
55 Var v;
56 for (int i = 0; i < scope.size(); i++) {
57 v = scope.get(i);
58 clause.push(-v.translate(tuple.get(v).intValue()));
59 }
60 solver.addClause(clause);
61
62 }
63
64 public void onSupport(ISolver solver, IVec<Var> scope,
65 Map<Evaluable, Integer> tuple) {
66 }
67
68 }