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.MaxWatchPb;
38 import org.sat4j.pb.constraints.pb.Pseudos;
39 import org.sat4j.pb.constraints.pb.WatchPb;
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 PBMaxDataStructure extends AbstractPBDataStructureFactory {
49
50 private static final long serialVersionUID = 1L;
51
52 /**
53 * @param literals
54 * @param coefs
55 * @param moreThan
56 * @param degree
57 * @return a counter-based PB constraint.
58 * @throws ContradictionException
59 */
60 @Override
61 protected Constr constraintFactory(int[] literals, BigInteger[] coefs,
62 BigInteger degree) throws ContradictionException {
63 // return MaxWatchPb.maxWatchPbNew(solver, getVocabulary(), literals,
64 // coefs, moreThan, degree);
65 return MaxWatchPb.normalizedMaxWatchPbNew(this.solver, getVocabulary(),
66 literals, coefs, degree,
67 AbstractPBClauseCardConstrDataStructure
68 .sumOfCoefficients(coefs));
69 }
70
71 /**
72 * @param literals
73 * @param weightedLits
74 * @param degree
75 * @return a counter-based PB constraint.
76 */
77 @Override
78 protected WatchPb learntConstraintFactory(IDataStructurePB dspb) {
79 return MaxWatchPb.normalizedWatchPbNew(getVocabulary(), dspb);
80 }
81
82 /*
83 * (non-Javadoc)
84 *
85 * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
86 * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt, int)
87 */
88 private Constr learntConstraintFactory(IVecInt literals,
89 IVec<BigInteger> coefs, BigInteger degree, boolean moreThan) {
90 int[] lits = new int[literals.size()];
91 literals.copyTo(lits);
92 BigInteger[] bc = new BigInteger[coefs.size()];
93 coefs.copyTo(bc);
94 degree = Pseudos.niceCheckedParametersForCompetition(lits, bc,
95 moreThan, degree);
96
97 return MaxWatchPb.normalizedWatchPbNew(getVocabulary(), new MapPb(
98 literals, coefs, degree));
99 }
100
101 @Override
102 protected Constr learntAtLeastConstraintFactory(IVecInt literals,
103 IVec<BigInteger> coefs, BigInteger degree) {
104 return learntConstraintFactory(literals, coefs, degree, true);
105 }
106
107 @Override
108 protected Constr learntAtMostConstraintFactory(IVecInt literals,
109 IVec<BigInteger> coefs, BigInteger degree) {
110 return learntConstraintFactory(literals, coefs, degree, false);
111 }
112
113 }