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