1 package org.sat4j.minisat.constraints.cnf;
2
3 import org.sat4j.minisat.core.ILits;
4 import org.sat4j.minisat.core.UnitPropagationListener;
5 import org.sat4j.specs.IVecInt;
6
7 /*******************************************************************************
8 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
9 *
10 * All rights reserved. This program and the accompanying materials
11 * are made available under the terms of the Eclipse Public License v1.0
12 * which accompanies this distribution, and is available at
13 * http://www.eclipse.org/legal/epl-v10.html
14 *
15 * Alternatively, the contents of this file may be used under the terms of
16 * either the GNU Lesser General Public License Version 2.1 or later (the
17 * "LGPL"), in which case the provisions of the LGPL are applicable instead
18 * of those above. If you wish to allow use of your version of this file only
19 * under the terms of the LGPL, and not to allow others to use your version of
20 * this file under the terms of the EPL, indicate your decision by deleting
21 * the provisions above and replace them with the notice and other provisions
22 * required by the LGPL. If you do not delete the provisions above, a recipient
23 * may use your version of this file under the terms of the EPL or the LGPL.
24 *
25 * Based on the original MiniSat specification from:
26 *
27 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
28 * Sixth International Conference on Theory and Applications of Satisfiability
29 * Testing, LNCS 2919, pp 502-518, 2003.
30 *
31 * See www.minisat.se for the original solver in C++.
32 *
33 *******************************************************************************/
34 public class OriginalBinaryClause extends BinaryClause {
35
36 /**
37 *
38 */
39 private static final long serialVersionUID = 1L;
40
41 public OriginalBinaryClause(IVecInt ps, ILits voc) {
42 super(ps, voc);
43 }
44
45 public void setLearnt() {
46 // do nothing
47 }
48
49 public boolean learnt() {
50 return false;
51 }
52
53 /**
54 * Creates a brand new clause, presumably from external data.
55 *
56 * @param s
57 * the object responsible for unit propagation
58 * @param voc
59 * the vocabulary
60 * @param literals
61 * the literals to store in the clause
62 * @return the created clause or null if the clause should be ignored
63 * (tautology for example)
64 */
65 public static OriginalBinaryClause brandNewClause(UnitPropagationListener s,
66 ILits voc, IVecInt literals) {
67 OriginalBinaryClause c = new OriginalBinaryClause(literals, voc);
68 c.register();
69 return c;
70 }
71 }