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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 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 }