1 /*
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2006 Daniel Le Berre
3 *
4 * Based on the original minisat specification from:
5 *
6 * An extensible SAT solver. Niklas E?n and Niklas S?rensson. Proceedings of the
7 * Sixth International Conference on Theory and Applications of Satisfiability
8 * Testing, LNCS 2919, pp 502-518, 2003.
9 *
10 * This library is free software; you can redistribute it and/or modify it under
11 * the terms of the GNU Lesser General Public License as published by the Free
12 * Software Foundation; either version 2.1 of the License, or (at your option)
13 * any later version.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
18 * details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 package org.sat4j.minisat.constraints;
27
28 import org.sat4j.minisat.constraints.cnf.LearntWLClause;
29 import org.sat4j.minisat.constraints.cnf.Lits23;
30 import org.sat4j.minisat.constraints.cnf.WLClause;
31 import org.sat4j.minisat.core.Constr;
32 import org.sat4j.minisat.core.ILits23;
33 import org.sat4j.specs.ContradictionException;
34 import org.sat4j.specs.IVecInt;
35
36 /**
37 * @author leberre To change the template for this generated type comment go to
38 * Window>Preferences>Java>Code Generation>Code and Comments
39 */
40 public class MixedDataStructureWithBinaryAndTernary extends
41 AbstractDataStructureFactory<ILits23> {
42
43 private static final long serialVersionUID = 1L;
44
45
46 /*
47 * (non-Javadoc)
48 *
49 * @see org.sat4j.minisat.DataStructureFactory#createClause(org.sat4j.datatype.VecInt)
50 */
51 public Constr createClause(IVecInt literals) throws ContradictionException {
52 IVecInt v = WLClause.sanityCheck(literals, lits, solver);
53 if (v == null)
54 return null;
55 if (v.size() == 2) {
56 lits.binaryClauses(v.get(0), v.get(1));
57 return null;
58 }
59 if (v.size() == 3) {
60 lits.ternaryClauses(v.get(0), v.get(1), v.get(2));
61 return null;
62 }
63 return WLClause.brandNewClause(solver, lits, v);
64 }
65
66 /*
67 * (non-Javadoc)
68 *
69 * @see org.sat4j.minisat.DataStructureFactory#learnContraint(org.sat4j.minisat.Constr)
70 */
71 @Override
72 public void learnConstraint(Constr constr) {
73 if (constr.size() == 2) {
74 lits.binaryClauses(constr.get(0), constr.get(1));
75 // solver.getStats().learnedbinaryclauses++;
76 } else if (constr.size() == 3) {
77 lits.ternaryClauses(constr.get(0), constr.get(1), constr.get(2));
78 // solver.getStats().learnedternaryclauses++;
79 } else {
80 super.learnConstraint(constr);
81 }
82 }
83
84 @Override
85 protected ILits23 createLits() {
86 return new Lits23();
87 }
88
89 public Constr createUnregisteredClause(IVecInt literals) {
90 return new LearntWLClause(literals, getVocabulary());
91 }
92
93 }