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.minisat.core.UnitPropagationListener;
34 import org.sat4j.specs.IVecInt;
35
36 public final class OriginalWLClause extends WLClause {
37
38 public OriginalWLClause(IVecInt ps, ILits voc) {
39 super(ps, voc);
40 }
41
42 /**
43 *
44 */
45 private static final long serialVersionUID = 1L;
46
47 /*
48 * (non-Javadoc)
49 *
50 * @see org.sat4j.minisat.constraints.cnf.WLClause#register()
51 */
52 public void register() {
53 assert this.lits.length > 1;
54 this.voc.watch(this.lits[0] ^ 1, this);
55 this.voc.watch(this.lits[1] ^ 1, this);
56 }
57
58 public boolean learnt() {
59 return false;
60 }
61
62 public void setLearnt() {
63 // do nothing
64 }
65
66 /**
67 * Creates a brand new clause, presumably from external data.
68 *
69 * @param s
70 * the object responsible for unit propagation
71 * @param voc
72 * the vocabulary
73 * @param literals
74 * the literals to store in the clause
75 * @return the created clause or null if the clause should be ignored
76 * (tautology for example)
77 */
78 public static OriginalWLClause brandNewClause(UnitPropagationListener s,
79 ILits voc, IVecInt literals) {
80 OriginalWLClause c = new OriginalWLClause(literals, voc);
81 c.register();
82 return c;
83 }
84
85 /**
86 * @since 2.1
87 */
88 public void forwardActivity(double claInc) {
89 this.activity += claInc;
90 }
91
92 /**
93 * @param claInc
94 */
95 public void incActivity(double claInc) {
96
97 }
98
99 }