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.tools;
31
32 import org.sat4j.specs.ContradictionException;
33 import org.sat4j.specs.IConstr;
34 import org.sat4j.specs.ISolver;
35 import org.sat4j.specs.IVecInt;
36 import org.sat4j.tools.encoding.EncodingStrategyAdapter;
37 import org.sat4j.tools.encoding.Policy;
38
39 /**
40 *
41 * A decorator for clausal cardinalities constraints.
42 *
43 * @author stephanieroussel
44 * @since 2.3.1
45 * @param <T>
46 */
47 public class ClausalCardinalitiesDecorator<T extends ISolver> extends
48 SolverDecorator<T> {
49
50 /**
51 *
52 */
53 private static final long serialVersionUID = 1L;
54
55 private final EncodingStrategyAdapter encodingAdapter;
56
57 public ClausalCardinalitiesDecorator(T solver) {
58 super(solver);
59 this.encodingAdapter = new Policy();
60 }
61
62 public ClausalCardinalitiesDecorator(T solver,
63 EncodingStrategyAdapter encodingAd) {
64 super(solver);
65 this.encodingAdapter = encodingAd;
66 }
67
68 @Override
69 public IConstr addAtLeast(IVecInt literals, int k)
70 throws ContradictionException {
71 if (k == 1) {
72 return this.encodingAdapter.addAtLeastOne(decorated(), literals);
73 } else {
74 return this.encodingAdapter.addAtLeast(decorated(), literals, k);
75 }
76 }
77
78 @Override
79 public IConstr addAtMost(IVecInt literals, int k)
80 throws ContradictionException {
81 if (k == 1) {
82 return this.encodingAdapter.addAtMostOne(decorated(), literals);
83 } else {
84 return this.encodingAdapter.addAtMost(decorated(), literals, k);
85 }
86 }
87
88 @Override
89 public IConstr addExactly(IVecInt literals, int k)
90 throws ContradictionException {
91
92 if (k == 1) {
93 return this.encodingAdapter.addExactlyOne(decorated(), literals);
94 } else {
95 return this.encodingAdapter.addExactly(decorated(), literals, k);
96 }
97 }
98
99 @Override
100 public String toString() {
101 return toString("");
102 }
103
104 @Override
105 public String toString(String prefix) {
106 return super.toString(prefix) + "\n"
107 + "Cardinality to SAT encoding: \n" + "Encoding: "
108 + this.encodingAdapter + "\n";
109 }
110
111 }