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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.Constr;
33  import org.sat4j.minisat.core.UnitPropagationListener;
34  import org.sat4j.specs.IVecInt;
35  
36  /**
37   * @since 2.1
38   */
39  public class UnitClauses implements Constr {
40  
41      protected final int[] literals;
42  
43      public UnitClauses(IVecInt values) {
44          this.literals = new int[values.size()];
45          values.copyTo(this.literals);
46      }
47  
48      public void assertConstraint(UnitPropagationListener s) {
49          for (int p : this.literals) {
50              s.enqueue(p, this);
51          }
52      }
53  
54      public void calcReason(int p, IVecInt outReason) {
55          throw new UnsupportedOperationException();
56  
57      }
58  
59      public double getActivity() {
60          throw new UnsupportedOperationException();
61      }
62  
63      public void incActivity(double claInc) {
64          // silent to prevent problems with xplain trick.
65      }
66  
67      public void setActivity(double claInc) {
68          // do nothing
69      }
70  
71      public boolean locked() {
72          throw new UnsupportedOperationException();
73      }
74  
75      public void register() {
76          throw new UnsupportedOperationException();
77      }
78  
79      public void remove(UnitPropagationListener upl) {
80          for (int i = this.literals.length - 1; i >= 0; i--) {
81              upl.unset(this.literals[i]);
82          }
83      }
84  
85      public void rescaleBy(double d) {
86          throw new UnsupportedOperationException();
87      }
88  
89      public void setLearnt() {
90          throw new UnsupportedOperationException();
91      }
92  
93      public boolean simplify() {
94          return false;
95      }
96  
97      public boolean propagate(UnitPropagationListener s, int p) {
98          throw new UnsupportedOperationException();
99      }
100 
101     public int get(int i) {
102         throw new UnsupportedOperationException();
103     }
104 
105     public boolean learnt() {
106         throw new UnsupportedOperationException();
107     }
108 
109     public int size() {
110         throw new UnsupportedOperationException();
111     }
112 
113     public void forwardActivity(double claInc) {
114         // silent to prevent problems with xplain trick.
115     }
116 
117     public boolean canBePropagatedMultipleTimes() {
118         return false;
119     }
120 }