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 static org.sat4j.core.LiteralsUtils.neg;
33
34 import org.sat4j.minisat.core.ILits;
35 import org.sat4j.specs.IVecInt;
36 import org.sat4j.specs.UnitPropagationListener;
37
38 /**
39 * @since 2.1
40 */
41 public class OriginalHTClause extends HTClause {
42
43 public OriginalHTClause(IVecInt ps, ILits voc) {
44 super(ps, voc);
45 }
46
47 /**
48 *
49 */
50 private static final long serialVersionUID = 1L;
51
52 /*
53 * (non-Javadoc)
54 *
55 * @see org.sat4j.minisat.constraints.cnf.WLClause#register()
56 */
57 public void register() {
58 this.voc.watch(neg(this.head), this);
59 this.voc.watch(neg(this.tail), this);
60 }
61
62 public boolean learnt() {
63 return false;
64 }
65
66 public void setLearnt() {
67 // do nothing
68 }
69
70 /**
71 * Creates a brand new clause, presumably from external data.
72 *
73 * @param s
74 * the object responsible for unit propagation
75 * @param voc
76 * the vocabulary
77 * @param literals
78 * the literals to store in the clause
79 * @return the created clause or null if the clause should be ignored
80 * (tautology for example)
81 */
82 public static OriginalHTClause brandNewClause(UnitPropagationListener s,
83 ILits voc, IVecInt literals) {
84 OriginalHTClause c = new OriginalHTClause(literals, voc);
85 c.register();
86 return c;
87 }
88
89 public void forwardActivity(double claInc) {
90 this.activity += claInc;
91 }
92
93 /**
94 * @param claInc
95 */
96 public void incActivity(double claInc) {
97
98 }
99
100 public void setActivity(double claInc) {
101 // do nothing
102 }
103 }