1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
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
16 * required by the LGPL. If you do not delete the provisions above, a recipient
17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *
19 * Based on the original MiniSat specification from:
20 *
21 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22 * Sixth International Conference on Theory and Applications of Satisfiability
23 * Testing, LNCS 2919, pp 502-518, 2003.
24 *
25 * See www.minisat.se for the original solver in C++.
26 *
27 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30 package org.sat4j.pb.core;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.minisat.core.IOrder;
35 import org.sat4j.minisat.core.LearningStrategy;
36 import org.sat4j.pb.constraints.pb.PBConstr;
37 import org.sat4j.specs.ContradictionException;
38 import org.sat4j.specs.IConstr;
39 import org.sat4j.specs.IVec;
40 import org.sat4j.specs.IVecInt;
41
42 public class PBSolverWithImpliedClause extends PBSolverCP {
43
44 public PBSolverWithImpliedClause(
45 LearningStrategy<PBDataStructureFactory> learner,
46 PBDataStructureFactory dsf, IOrder order) {
47 super(learner, dsf, order);
48 }
49
50 /**
51 *
52 */
53 private static final long serialVersionUID = 1L;
54
55 @Override
56 public IConstr addPseudoBoolean(IVecInt literals, IVec<BigInteger> coeffs,
57 boolean moreThan, BigInteger degree) throws ContradictionException {
58 IVecInt vlits = dimacs2internal(literals);
59 assert vlits.size() == literals.size();
60 assert literals.size() == coeffs.size();
61 PBConstr result = (PBConstr) this.dsfactory
62 .createPseudoBooleanConstraint(vlits, coeffs, moreThan, degree);
63 if (result != null) {
64 IVecInt clits = result.computeAnImpliedClause();
65 if (clits != null) {
66 addConstr(this.dsfactory.createClause(clits));
67 }
68 }
69 return addConstr(result);
70 }
71
72 @Override
73 public String toString(String prefix) {
74 return super.toString(prefix) + "\n" + prefix
75 + "Add implied clauses in preprocessing";
76 }
77 }