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.specs.IVecInt;
34 import org.sat4j.specs.UnitPropagationListener;
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 assertConstraintIfNeeded(UnitPropagationListener s) {
55 assertConstraint(s);
56 }
57
58 public void calcReason(int p, IVecInt outReason) {
59 throw new UnsupportedOperationException();
60
61 }
62
63 public double getActivity() {
64 throw new UnsupportedOperationException();
65 }
66
67 public void incActivity(double claInc) {
68 // silent to prevent problems with xplain trick.
69 }
70
71 public void setActivity(double claInc) {
72 // do nothing
73 }
74
75 public boolean locked() {
76 throw new UnsupportedOperationException();
77 }
78
79 public void register() {
80 throw new UnsupportedOperationException();
81 }
82
83 public void remove(UnitPropagationListener upl) {
84 for (int i = this.literals.length - 1; i >= 0; i--) {
85 upl.unset(this.literals[i]);
86 }
87 }
88
89 public void rescaleBy(double d) {
90 throw new UnsupportedOperationException();
91 }
92
93 public void setLearnt() {
94 throw new UnsupportedOperationException();
95 }
96
97 public boolean simplify() {
98 return false;
99 }
100
101 public boolean propagate(UnitPropagationListener s, int p) {
102 throw new UnsupportedOperationException();
103 }
104
105 public int get(int i) {
106 throw new UnsupportedOperationException();
107 }
108
109 public boolean learnt() {
110 throw new UnsupportedOperationException();
111 }
112
113 public int size() {
114 throw new UnsupportedOperationException();
115 }
116
117 public void forwardActivity(double claInc) {
118 // silent to prevent problems with xplain trick.
119 }
120
121 public boolean canBePropagatedMultipleTimes() {
122 return false;
123 }
124
125 public void calcReasonOnTheFly(int p, IVecInt trail, IVecInt outReason) {
126 calcReason(p, outReason);
127 }
128 }