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.pb.constraints.pb;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.minisat.constraints.cnf.OriginalBinaryClause;
35 import org.sat4j.minisat.core.ILits;
36 import org.sat4j.specs.IVecInt;
37 import org.sat4j.specs.UnitPropagationListener;
38
39 public final class OriginalBinaryClausePB extends OriginalBinaryClause
40 implements PBConstr {
41
42 public OriginalBinaryClausePB(IVecInt ps, ILits voc) {
43 super(ps, voc);
44 // TODO Auto-generated constructor stub
45 }
46
47 /**
48 *
49 */
50 private static final long serialVersionUID = 1L;
51
52 public IVecInt computeAnImpliedClause() {
53 return null;
54 }
55
56 public BigInteger getCoef(int literal) {
57 return BigInteger.ONE;
58 }
59
60 public BigInteger[] getCoefs() {
61 BigInteger[] tmp = new BigInteger[size()];
62 for (int i = 0; i < tmp.length; i++) {
63 tmp[i] = BigInteger.ONE;
64 }
65 return tmp;
66 }
67
68 public BigInteger getDegree() {
69 return BigInteger.ONE;
70 }
71
72 /**
73 * Creates a brand new clause, presumably from external data.
74 *
75 * @param s
76 * the object responsible for unit propagation
77 * @param voc
78 * the vocabulary
79 * @param literals
80 * the literals to store in the clause
81 * @return the created clause or null if the clause should be ignored
82 * (tautology for example)
83 */
84 public static OriginalBinaryClausePB brandNewClause(
85 UnitPropagationListener s, ILits voc, IVecInt literals) {
86 OriginalBinaryClausePB c = new OriginalBinaryClausePB(literals, voc);
87 c.register();
88 return c;
89 }
90
91 }