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
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13 * under the terms of the LGPL, and not to allow others to use your version of
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18 *******************************************************************************/
19 package org.sat4j.csp.constraints;
20
21 import org.sat4j.core.VecInt;
22 import org.sat4j.csp.Evaluable;
23 import org.sat4j.csp.Var;
24 import org.sat4j.specs.ContradictionException;
25 import org.sat4j.specs.ISolver;
26 import org.sat4j.specs.IVec;
27 import org.sat4j.specs.IVecInt;
28
29 public class Nogoods implements Relation {
30
31 private final int[][] tuples;
32
33 private final int arity;
34
35 public Nogoods(int arity, int nbtuples) {
36 tuples = new int[nbtuples][];
37 this.arity = arity;
38 }
39
40 public void addTuple(int index, int[] tuple) {
41 tuples[index] = tuple;
42 }
43
44 public void toClause(ISolver solver, IVec<Var> scope, IVec<Evaluable> vars)
45 throws ContradictionException {
46 IVecInt clause = new VecInt();
47 for (int i = 0; i < tuples.length; i++) {
48 clause.clear();
49 for (int j = 0; j < scope.size(); j++) {
50 clause.push(-scope.get(j).translate(tuples[i][j]));
51 }
52 solver.addClause(clause);
53 }
54 }
55
56 public int arity() {
57 return arity;
58 }
59 }