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.card.AtLeast;
35 import org.sat4j.minisat.core.ILits;
36 import org.sat4j.minisat.core.UnitPropagationListener;
37 import org.sat4j.specs.ContradictionException;
38 import org.sat4j.specs.IVecInt;
39
40 public final class AtLeastPB extends AtLeast implements PBConstr {
41
42 /**
43 *
44 */
45 private static final long serialVersionUID = 1L;
46
47 private final BigInteger degree;
48
49 private AtLeastPB(ILits voc, IVecInt ps, int degree) {
50 super(voc, ps, degree);
51 this.degree = BigInteger.valueOf(degree);
52 }
53
54 public static PBConstr atLeastNew(UnitPropagationListener s, ILits voc,
55 IVecInt ps, int n) throws ContradictionException {
56 int degree = niceParameters(s, voc, ps, n);
57 if (degree == 0) {
58 return new UnitClausesPB(ps);
59 }
60 return new AtLeastPB(voc, ps, degree);
61 }
62
63 public static AtLeastPB atLeastNew(ILits voc, IVecInt ps, int n) {
64 return new AtLeastPB(voc, ps, n);
65 }
66
67 public BigInteger getCoef(int literal) {
68 return BigInteger.ONE;
69 }
70
71 public BigInteger getDegree() {
72 return this.degree;
73 }
74
75 public ILits getVocabulary() {
76 return this.voc;
77 }
78
79 public int[] getLits() {
80 int[] tmp = new int[size()];
81 System.arraycopy(this.lits, 0, tmp, 0, size());
82 return tmp;
83 }
84
85 public BigInteger[] getCoefs() {
86 BigInteger[] tmp = new BigInteger[size()];
87 for (int i = 0; i < tmp.length; i++) {
88 tmp[i] = BigInteger.ONE;
89 }
90 return tmp;
91 }
92
93 /**
94 *
95 */
96 private boolean learnt = false;
97
98 /**
99 * D?termine si la contrainte est apprise
100 *
101 * @return true si la contrainte est apprise, false sinon
102 * @see org.sat4j.specs.IConstr#learnt()
103 */
104 @Override
105 public boolean learnt() {
106 return this.learnt;
107 }
108
109 @Override
110 public void setLearnt() {
111 this.learnt = true;
112 }
113
114 @Override
115 public void register() {
116 assert this.learnt;
117 // countFalsified();
118 }
119
120 @Override
121 public void assertConstraint(UnitPropagationListener s) {
122 for (int i = 0; i < size(); i++) {
123 if (getVocabulary().isUnassigned(get(i))) {
124 boolean ret = s.enqueue(get(i), this);
125 assert ret;
126 }
127 }
128 }
129
130 public IVecInt computeAnImpliedClause() {
131 return null;
132 }
133
134 }