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.constraints;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.minisat.core.Constr;
35 import org.sat4j.pb.constraints.pb.IDataStructurePB;
36 import org.sat4j.pb.constraints.pb.MapPb;
37 import org.sat4j.pb.constraints.pb.MinWatchPb;
38 import org.sat4j.pb.constraints.pb.PBConstr;
39 import org.sat4j.pb.constraints.pb.Pseudos;
40 import org.sat4j.specs.ContradictionException;
41 import org.sat4j.specs.IVec;
42 import org.sat4j.specs.IVecInt;
43
44 /**
45 * @author leberre To change the template for this generated type comment go to
46 * Window - Preferences - Java - Code Generation - Code and Comments
47 */
48 public class PBMinDataStructure extends AbstractPBDataStructureFactory {
49
50 private static final long serialVersionUID = 1L;
51
52 /*
53 * (non-Javadoc)
54 *
55 * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
56 * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt,
57 * boolean, int)
58 */
59 @Override
60 protected PBConstr constraintFactory(int[] literals, BigInteger[] coefs,
61 BigInteger degree) throws ContradictionException {
62 return MinWatchPb.normalizedMinWatchPbNew(this.solver, getVocabulary(),
63 literals, coefs, degree,
64 AbstractPBClauseCardConstrDataStructure
65 .sumOfCoefficients(coefs));
66 }
67
68 /*
69 * (non-Javadoc)
70 *
71 * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
72 * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt, int)
73 */
74 @Override
75 protected Constr learntConstraintFactory(IDataStructurePB dspb) {
76 return MinWatchPb.normalizedWatchPbNew(getVocabulary(), dspb);
77 }
78
79 /*
80 * (non-Javadoc)
81 *
82 * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
83 * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt, int)
84 */
85 private Constr learntConstraintFactory(IVecInt literals,
86 IVec<BigInteger> coefs, BigInteger degree, boolean moreThan) {
87 int[] lits = new int[literals.size()];
88 literals.copyTo(lits);
89 BigInteger[] bc = new BigInteger[coefs.size()];
90 coefs.copyTo(bc);
91 degree = Pseudos.niceCheckedParametersForCompetition(lits, bc,
92 moreThan, degree);
93
94 return MinWatchPb.normalizedWatchPbNew(getVocabulary(), new MapPb(
95 literals, coefs, degree));
96 }
97
98 @Override
99 protected Constr learntAtLeastConstraintFactory(IVecInt literals,
100 IVec<BigInteger> coefs, BigInteger degree) {
101 return learntConstraintFactory(literals, coefs, degree, true);
102 }
103
104 @Override
105 protected Constr learntAtMostConstraintFactory(IVecInt literals,
106 IVec<BigInteger> coefs, BigInteger degree) {
107 return learntConstraintFactory(literals, coefs, degree, false);
108 }
109
110 }