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.LearntWLClause;
32 import org.sat4j.minisat.constraints.cnf.Lits;
33 import org.sat4j.minisat.constraints.cnf.MixableCBClause;
34 import org.sat4j.minisat.core.Constr;
35 import org.sat4j.minisat.core.ILits;
36 import org.sat4j.specs.ContradictionException;
37 import org.sat4j.specs.IVecInt;
38
39 /**
40 * @author leberre Uses Counter Based data strcuture for the original clausal in
41 * the database and uses Watched Literals Data structure for learned
42 * clauses.
43 */
44 public class ClausalDataStructureCBWL extends AbstractDataStructureFactory {
45
46 private static final long serialVersionUID = 1L;
47
48 /*
49 * (non-Javadoc)
50 *
51 * @see org.sat4j.minisat.DataStructureFactory#createClause(org.sat4j.datatype.VecInt)
52 */
53 public Constr createClause(IVecInt literals) throws ContradictionException {
54 IVecInt v = Clauses.sanityCheck(literals, getVocabulary(), solver);
55 if (v == null)
56 return null;
57 return MixableCBClause.brandNewClause(solver, getVocabulary(), v);
58 }
59
60 public Constr createUnregisteredClause(IVecInt literals) {
61 return new LearntWLClause(literals, getVocabulary());
62 }
63
64 @Override
65 protected ILits createLits() {
66 return new Lits();
67 }
68 }