1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le
3 * Berre
4 *
5 * All rights reserved. This program and the accompanying materials are made
6 * available under the terms of the Eclipse Public License v1.0 which
7 * accompanies this distribution, and is available at
8 * http://www.eclipse.org/legal/epl-v10.html
9 *
10 * Alternatively, the contents of this file may be used under the terms of
11 * either the GNU Lesser General Public License Version 2.1 or later (the
12 * "LGPL"), in which case the provisions of the LGPL are applicable instead of
13 * those above. If you wish to allow use of your version of this file only under
14 * the terms of the LGPL, and not to allow others to use your version of this
15 * file under the terms of the EPL, indicate your decision by deleting the
16 * provisions above and replace them with the notice and other provisions
17 * required by the LGPL. If you do not delete the provisions above, a recipient
18 * may use your version of this file under the terms of the EPL or the LGPL.
19 *
20 * Based on the original MiniSat specification from:
21 *
22 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
23 * Sixth International Conference on Theory and Applications of Satisfiability
24 * Testing, LNCS 2919, pp 502-518, 2003.
25 *
26 * See www.minisat.se for the original solver in C++.
27 *
28 *******************************************************************************/
29 package org.sat4j.minisat.constraints.cnf;
30
31 import org.sat4j.minisat.core.ILits;
32 import org.sat4j.minisat.core.UnitPropagationListener;
33 import org.sat4j.specs.IVecInt;
34
35 /**
36 * @since 2.1
37 */
38 public class OriginalBinaryClause extends BinaryClause {
39
40 /**
41 *
42 */
43 private static final long serialVersionUID = 1L;
44
45 public OriginalBinaryClause(IVecInt ps, ILits voc) {
46 super(ps, voc);
47 }
48
49 public void setLearnt() {
50 // do nothing
51 }
52
53 public boolean learnt() {
54 return false;
55 }
56
57 /**
58 * Creates a brand new clause, presumably from external data.
59 *
60 * @param s
61 * the object responsible for unit propagation
62 * @param voc
63 * the vocabulary
64 * @param literals
65 * the literals to store in the clause
66 * @return the created clause or null if the clause should be ignored
67 * (tautology for example)
68 */
69 public static OriginalBinaryClause brandNewClause(
70 UnitPropagationListener s, ILits voc, IVecInt literals) {
71 OriginalBinaryClause c = new OriginalBinaryClause(literals, voc);
72 c.register();
73 return c;
74 }
75
76 public void forwardActivity(double claInc) {
77 activity += claInc;
78 }
79
80 /**
81 * @param claInc
82 */
83 public void incActivity(double claInc) {
84
85 }
86 }