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
35 public final class LearntWLClause extends WLClause {
36
37 public LearntWLClause(IVecInt ps, ILits voc) {
38 super(ps, voc);
39 }
40
41 /**
42 *
43 */
44 private static final long serialVersionUID = 1L;
45
46 /*
47 * (non-Javadoc)
48 *
49 * @see org.sat4j.minisat.constraints.cnf.WLClause#register()
50 */
51 public void register() {
52 assert this.lits.length > 1;
53 // prendre un deuxieme litt???ral ??? surveiller
54 int maxi = 1;
55 int maxlevel = this.voc.getLevel(this.lits[1]);
56 for (int i = 2; i < this.lits.length; i++) {
57 int level = this.voc.getLevel(this.lits[i]);
58 if (level > maxlevel) {
59 maxi = i;
60 maxlevel = level;
61 }
62 }
63 int l = this.lits[1];
64 this.lits[1] = this.lits[maxi];
65 this.lits[maxi] = l;
66
67 // ajoute la clause a la liste des clauses control???es.
68 this.voc.watch(this.lits[0] ^ 1, this);
69 this.voc.watch(this.lits[1] ^ 1, this);
70
71 }
72
73 public boolean learnt() {
74 return true;
75 }
76
77 public void setLearnt() {
78 // do nothing
79 }
80
81 /**
82 * @since 2.1
83 */
84 public void forwardActivity(double claInc) {
85
86 }
87
88 /**
89 * @param claInc
90 */
91 public void incActivity(double claInc) {
92 this.activity += claInc;
93 }
94 }