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 package org.sat4j.minisat.constraints.cnf;
26
27 import org.sat4j.minisat.core.ILits;
28 import org.sat4j.minisat.core.UnitPropagationListener;
29 import org.sat4j.specs.IVecInt;
30
31 public class OriginalWLClause extends WLClause {
32
33 public OriginalWLClause(IVecInt ps, ILits voc) {
34 super(ps, voc);
35 }
36
37 /**
38 *
39 */
40 private static final long serialVersionUID = 1L;
41
42 /*
43 * (non-Javadoc)
44 *
45 * @see org.sat4j.minisat.constraints.cnf.WLClause#register()
46 */
47 public void register() {
48 assert lits.length > 1;
49 voc.watch(lits[0] ^ 1, this);
50 voc.watch(lits[1] ^ 1, this);
51 }
52
53 public boolean learnt() {
54 return false;
55 }
56
57 public void setLearnt() {
58 // do nothing
59 }
60
61 /**
62 * Creates a brand new clause, presumably from external data.
63 *
64 * @param s
65 * the object responsible for unit propagation
66 * @param voc
67 * the vocabulary
68 * @param literals
69 * the literals to store in the clause
70 * @return the created clause or null if the clause should be ignored
71 * (tautology for example)
72 */
73 public static OriginalWLClause brandNewClause(UnitPropagationListener s,
74 ILits voc, IVecInt literals) {
75 OriginalWLClause c = new OriginalWLClause(literals, voc);
76 c.register();
77 return c;
78 }
79 }