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
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 *******************************************************************************/
28 package org.sat4j.minisat.constraints;
29
30 import org.sat4j.minisat.constraints.cnf.Clauses;
31 import org.sat4j.minisat.constraints.cnf.LearntBinaryClause;
32 import org.sat4j.minisat.constraints.cnf.LearntHTClause;
33 import org.sat4j.minisat.constraints.cnf.Lits23;
34 import org.sat4j.minisat.constraints.cnf.OriginalHTClause;
35 import org.sat4j.minisat.constraints.cnf.UnitClause;
36 import org.sat4j.minisat.core.Constr;
37 import org.sat4j.minisat.core.ILits23;
38 import org.sat4j.specs.ContradictionException;
39 import org.sat4j.specs.IVecInt;
40
41 /**
42 * @author leberre
43 */
44 public class MixedDataStructureWithBinaryAndTernary extends
45 AbstractDataStructureFactory<ILits23> {
46
47 private static final long serialVersionUID = 1L;
48
49
50 /*
51 * (non-Javadoc)
52 *
53 * @see org.sat4j.minisat.DataStructureFactory#createClause(org.sat4j.datatype.VecInt)
54 */
55 public Constr createClause(IVecInt literals) throws ContradictionException {
56 IVecInt v = Clauses.sanityCheck(literals, lits, solver);
57 if (v == null)
58 return null;
59 if (v.size() == 2) {
60 lits.binaryClauses(v.get(0), v.get(1));
61 return null;
62 }
63 if (v.size() == 3) {
64 lits.ternaryClauses(v.get(0), v.get(1), v.get(2));
65 return null;
66 }
67 return OriginalHTClause.brandNewClause(solver, lits, v);
68 }
69
70 /*
71 * (non-Javadoc)
72 *
73 * @see org.sat4j.minisat.DataStructureFactory#learnContraint(org.sat4j.minisat.Constr)
74 */
75 @Override
76 public void learnConstraint(Constr constr) {
77 if (constr.size() == 2) {
78 lits.binaryClauses(constr.get(0), constr.get(1));
79 // solver.getStats().learnedbinaryclauses++;
80 } else if (constr.size() == 3) {
81 lits.ternaryClauses(constr.get(0), constr.get(1), constr.get(2));
82 // solver.getStats().learnedternaryclauses++;
83 } else {
84 super.learnConstraint(constr);
85 }
86 }
87
88 @Override
89 protected ILits23 createLits() {
90 return new Lits23();
91 }
92
93 public Constr createUnregisteredClause(IVecInt literals) {
94 if (literals.size()==1) {
95 return new UnitClause(literals.last());
96 }
97 if (literals.size() == 2) {
98 return new LearntBinaryClause(literals,getVocabulary());
99 }
100 return new LearntHTClause(literals, getVocabulary());
101 }
102
103 }