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.Lits;
30 import org.sat4j.minisat.constraints.cnf.MixableCBClause;
31 import org.sat4j.minisat.constraints.cnf.WLClause;
32 import org.sat4j.minisat.core.Constr;
33 import org.sat4j.minisat.core.ILits;
34 import org.sat4j.specs.ContradictionException;
35 import org.sat4j.specs.IVecInt;
36
37 /**
38 * @author leberre Uses Counter Based data strcuture for the original clausal in
39 * the database and uses Watched Literals Data structure for learned
40 * clauses.
41 */
42 public class ClausalDataStructureCBWL extends AbstractDataStructureFactory<ILits> {
43
44 private static final long serialVersionUID = 1L;
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, getVocabulary(), solver);
53 if (v == null)
54 return null;
55 return MixableCBClause.brandNewClause(solver, getVocabulary(), v);
56 }
57
58 public Constr createUnregisteredClause(IVecInt literals) {
59 return new LearntWLClause(literals, getVocabulary());
60 }
61
62 @Override
63 protected ILits createLits() {
64 return new Lits();
65 }
66 }