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.Lits2;
30 import org.sat4j.minisat.constraints.cnf.WLClause;
31 import org.sat4j.minisat.core.Constr;
32 import org.sat4j.minisat.core.ILits2;
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 MixedDataStructureWithBinary extends AbstractDataStructureFactory<ILits2> {
41
42 private static final long serialVersionUID = 1L;
43
44 @Override
45 public ILits2 createLits() {
46 return new Lits2();
47 }
48
49 /*
50 * (non-Javadoc)
51 *
52 * @see org.sat4j.minisat.DataStructureFactory#createClause(org.sat4j.datatype.VecInt)
53 */
54 public Constr createClause(IVecInt literals) throws ContradictionException {
55 IVecInt v = WLClause.sanityCheck(literals, lits, solver);
56 if (v == null)
57 return null;
58 if (v.size() == 2) {
59 lits.binaryClauses(v.get(0), v.get(1));
60 return null;
61 }
62 return WLClause.brandNewClause(solver, lits, v);
63 }
64
65 /*
66 * (non-Javadoc)
67 *
68 * @see org.sat4j.minisat.DataStructureFactory#learnContraint(org.sat4j.minisat.Constr)
69 */
70 @Override
71 public void learnConstraint(Constr constr) {
72 if (constr.size() == 2) {
73 lits.binaryClauses(constr.get(0), constr.get(1));
74 // solver.getStats().learnedbinaryclauses++;
75 } else {
76 super.learnConstraint(constr);
77 }
78 }
79
80 public Constr createUnregisteredClause(IVecInt literals) {
81 return new LearntWLClause(literals, getVocabulary());
82 }
83 }