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