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
31 package org.sat4j.tools.encoding;
32
33 import java.io.Serializable;
34
35 import org.sat4j.core.VecInt;
36 import org.sat4j.specs.ContradictionException;
37 import org.sat4j.specs.IConstr;
38 import org.sat4j.specs.ISolver;
39 import org.sat4j.specs.IVecInt;
40
41 /**
42 * The aim of this class is to use different encodings for specific constraints.
43 * The class is abstract because it does not makes sense to use it "as is".
44 *
45 * @author sroussel
46 * @since 2.3.1
47 */
48 public abstract class EncodingStrategyAdapter implements Serializable {
49
50 /**
51 *
52 */
53 private static final long serialVersionUID = 1L;
54
55 public IConstr addAtLeast(ISolver solver, IVecInt literals, int degree)
56 throws ContradictionException {
57 final int n = literals.size();
58 IVecInt newLiterals = new VecInt(n);
59 for (int i = 0; i < n; i++) {
60 newLiterals.push(-literals.get(i));
61 }
62 return this.addAtMost(solver, newLiterals, n - degree);
63 }
64
65 public IConstr addAtLeastOne(ISolver solver, IVecInt literals)
66 throws ContradictionException {
67 return solver.addClause(literals);
68 }
69
70 public IConstr addAtMost(ISolver solver, IVecInt literals, int degree)
71 throws ContradictionException {
72 return solver.addAtMost(literals, degree);
73 }
74
75 public IConstr addAtMostOne(ISolver solver, IVecInt literals)
76 throws ContradictionException {
77 return this.addAtMost(solver, literals, 1);
78 }
79
80 public IConstr addExactly(ISolver solver, IVecInt literals, int degree)
81 throws ContradictionException {
82 return solver.addExactly(literals, degree);
83 }
84
85 public IConstr addExactlyOne(ISolver solver, IVecInt literals)
86 throws ContradictionException {
87 return this.addExactly(solver, literals, 1);
88 }
89
90 @Override
91 public String toString() {
92 return this.getClass().getName();
93 }
94
95 }