1 package org.sat4j.tools;
2
3 /*******************************************************************************
4 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
5 *
6 * All rights reserved. This program and the accompanying materials
7 * are made available under the terms of the Eclipse Public License v1.0
8 * which accompanies this distribution, and is available at
9 * http://www.eclipse.org/legal/epl-v10.html
10 *
11 * Alternatively, the contents of this file may be used under the terms of
12 * either the GNU Lesser General Public License Version 2.1 or later (the
13 * "LGPL"), in which case the provisions of the LGPL are applicable instead
14 * of those above. If you wish to allow use of your version of this file only
15 * under the terms of the LGPL, and not to allow others to use your version of
16 * this file under the terms of the EPL, indicate your decision by deleting
17 * the provisions above and replace them with the notice and other provisions
18 * required by the LGPL. If you do not delete the provisions above, a recipient
19 * may use your version of this file under the terms of the EPL or the LGPL.
20 *
21 * Based on the original MiniSat specification from:
22 *
23 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
24 * Sixth International Conference on Theory and Applications of Satisfiability
25 * Testing, LNCS 2919, pp 502-518, 2003.
26 *
27 * See www.minisat.se for the original solver in C++.
28 *
29 * Contributors:
30 * CRIL - initial API and implementation
31 *******************************************************************************/
32
33 import org.sat4j.specs.ContradictionException;
34 import org.sat4j.specs.IConstr;
35 import org.sat4j.specs.ISolver;
36 import org.sat4j.specs.IVecInt;
37 import org.sat4j.tools.encoding.EncodingStrategyAdapter;
38 import org.sat4j.tools.encoding.Policy;
39
40 /**
41 *
42 * A decorator for clausal cardinalities constraints.
43 *
44 * @author stephanieroussel
45 * @since 2.3.1
46 * @param <T>
47 */
48 public class ClausalCardinalitiesDecorator<T extends ISolver> extends
49 SolverDecorator<T> {
50
51 /**
52 *
53 */
54 private static final long serialVersionUID = 1L;
55
56 private final EncodingStrategyAdapter encodingAdapter;
57
58 public ClausalCardinalitiesDecorator(T solver) {
59 super(solver);
60 this.encodingAdapter = new Policy();
61 }
62
63 public ClausalCardinalitiesDecorator(T solver,
64 EncodingStrategyAdapter encodingAd) {
65 super(solver);
66 this.encodingAdapter = encodingAd;
67 }
68
69 @Override
70 public IConstr addAtLeast(IVecInt literals, int k)
71 throws ContradictionException {
72 if (k == 1) {
73 return this.encodingAdapter.addAtLeastOne(decorated(), literals);
74 } else {
75 return this.encodingAdapter.addAtLeast(decorated(), literals, k);
76 }
77 }
78
79 @Override
80 public IConstr addAtMost(IVecInt literals, int k)
81 throws ContradictionException {
82 if (k == 1) {
83 return this.encodingAdapter.addAtMostOne(decorated(), literals);
84 } else {
85 return this.encodingAdapter.addAtMost(decorated(), literals, k);
86 }
87 }
88
89 @Override
90 public IConstr addExactly(IVecInt literals, int k)
91 throws ContradictionException {
92
93 if (k == 1) {
94 return this.encodingAdapter.addExactlyOne(decorated(), literals);
95 } else {
96 return this.encodingAdapter.addExactly(decorated(), literals, k);
97 }
98 }
99
100 @Override
101 public String toString() {
102 return toString("");
103 }
104
105 @Override
106 public String toString(String prefix) {
107 return super.toString(prefix) + "\n"
108 + "Cardinality to SAT encoding: \n" + "Encoding: "
109 + this.encodingAdapter + "\n";
110 }
111
112 }