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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  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  }