1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
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 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30 package org.sat4j.minisat.constraints.cnf;
31
32 import org.sat4j.minisat.core.ILits;
33 import org.sat4j.specs.IVecInt;
34 import org.sat4j.specs.UnitPropagationListener;
35
36 /**
37 * @since 2.1
38 */
39 public class OriginalBinaryClause extends BinaryClause {
40
41 /**
42 *
43 */
44 private static final long serialVersionUID = 1L;
45
46 public OriginalBinaryClause(IVecInt ps, ILits voc) {
47 super(ps, voc);
48 }
49
50 public void setLearnt() {
51 // do nothing
52 }
53
54 public boolean learnt() {
55 return false;
56 }
57
58 /**
59 * Creates a brand new clause, presumably from external data.
60 *
61 * @param s
62 * the object responsible for unit propagation
63 * @param voc
64 * the vocabulary
65 * @param literals
66 * the literals to store in the clause
67 * @return the created clause or null if the clause should be ignored
68 * (tautology for example)
69 */
70 public static OriginalBinaryClause brandNewClause(
71 UnitPropagationListener s, ILits voc, IVecInt literals) {
72 OriginalBinaryClause c = new OriginalBinaryClause(literals, voc);
73 c.register();
74 return c;
75 }
76
77 public void forwardActivity(double claInc) {
78 this.activity += claInc;
79 }
80
81 /**
82 * @param claInc
83 */
84 public void incActivity(double claInc) {
85
86 }
87
88 public void setActivity(double claInc) {
89 // do nothing
90 }
91 }