View Javadoc

1   /*******************************************************************************
2    * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
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   *******************************************************************************/
28  package org.sat4j.minisat.constraints.cnf;
29  
30  import org.sat4j.minisat.core.Constr;
31  import org.sat4j.minisat.core.UnitPropagationListener;
32  import org.sat4j.specs.IVecInt;
33  
34  /**
35   * @since 2.1
36   */
37  public class UnitClauses implements Constr {
38  
39  	protected final int[] literals;
40  
41  	public UnitClauses(IVecInt values) {
42  		literals = new int[values.size()];
43  		values.copyTo(literals);
44  	}
45  
46  	public void assertConstraint(UnitPropagationListener s) {
47  		for (int p : literals) {
48  			s.enqueue(p, this);
49  		}
50  	}
51  
52  	public void calcReason(int p, IVecInt outReason) {
53  		throw new UnsupportedOperationException();
54  
55  	}
56  
57  	public double getActivity() {
58  		throw new UnsupportedOperationException();
59  	}
60  
61  	public void incActivity(double claInc) {
62  		// silent to prevent problems with xplain trick.
63  	}
64  
65  	public boolean locked() {
66  		throw new UnsupportedOperationException();
67  	}
68  
69  	public void register() {
70  		throw new UnsupportedOperationException();
71  	}
72  
73  	public void remove(UnitPropagationListener upl) {
74  		for (int i = literals.length - 1; i >= 0; i--) {
75  			upl.unset(literals[i]);
76  		}
77  	}
78  
79  	public void rescaleBy(double d) {
80  		throw new UnsupportedOperationException();
81  	}
82  
83  	public void setLearnt() {
84  		throw new UnsupportedOperationException();
85  	}
86  
87  	public boolean simplify() {
88  		throw new UnsupportedOperationException();
89  	}
90  
91  	public boolean propagate(UnitPropagationListener s, int p) {
92  		throw new UnsupportedOperationException();
93  	}
94  
95  	public int get(int i) {
96  		throw new UnsupportedOperationException();
97  	}
98  
99  	public boolean learnt() {
100 		throw new UnsupportedOperationException();
101 	}
102 
103 	public int size() {
104 		throw new UnsupportedOperationException();
105 	}
106 
107 	public void forwardActivity(double claInc) {
108 		// silent to prevent problems with xplain trick.
109 	}
110 
111 	public boolean canBePropagatedMultipleTimes() {
112 		return false;
113 	}
114 }