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 *
36 * @author daniel
37 * @since 2.1
38 */
39 public class UnitClause implements Constr {
40
41 protected final int literal;
42
43 public UnitClause(int value) {
44 literal = value;
45 }
46
47 public void assertConstraint(UnitPropagationListener s) {
48 s.enqueue(literal, this);
49 }
50
51 public void calcReason(int p, IVecInt outReason) {
52 throw new UnsupportedOperationException();
53
54 }
55
56 public double getActivity() {
57 throw new UnsupportedOperationException();
58 }
59
60 public void incActivity(double claInc) {
61 // silent to prevent problems with xplain trick.
62 }
63
64 public boolean locked() {
65 throw new UnsupportedOperationException();
66 }
67
68 public void register() {
69 throw new UnsupportedOperationException();
70 }
71
72 public void remove(UnitPropagationListener upl) {
73 upl.unset(literal);
74 }
75
76 public void rescaleBy(double d) {
77 throw new UnsupportedOperationException();
78 }
79
80 public void setLearnt() {
81 throw new UnsupportedOperationException();
82 }
83
84 public boolean simplify() {
85 throw new UnsupportedOperationException();
86 }
87
88 public boolean propagate(UnitPropagationListener s, int p) {
89 throw new UnsupportedOperationException();
90 }
91
92 public int get(int i) {
93 if (i > 0)
94 throw new IllegalArgumentException();
95 return literal;
96 }
97
98 public boolean learnt() {
99 throw new UnsupportedOperationException();
100 }
101
102 public int size() {
103 return 1;
104 }
105
106 public void forwardActivity(double claInc) {
107 // silent to prevent problems with xplain trick.
108 }
109 }