1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
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 *******************************************************************************/
28 package org.sat4j.pb.constraints.pb;
29
30 import java.math.BigInteger;
31
32 import org.sat4j.minisat.constraints.cnf.OriginalHTClause;
33 import org.sat4j.minisat.core.ILits;
34 import org.sat4j.minisat.core.UnitPropagationListener;
35 import org.sat4j.specs.IVecInt;
36
37 public final class OriginalHTClausePB extends OriginalHTClause implements
38 PBConstr {
39
40 public OriginalHTClausePB(IVecInt ps, ILits voc) {
41 super(ps, voc);
42 }
43
44 /**
45 *
46 */
47 private static final long serialVersionUID = 1L;
48
49 public IVecInt computeAnImpliedClause() {
50 return null;
51 }
52
53 public BigInteger getCoef(int literal) {
54 return BigInteger.ONE;
55 }
56
57 public BigInteger[] getCoefs() {
58 BigInteger[] tmp = new BigInteger[size()];
59 for (int i = 0; i < tmp.length; i++)
60 tmp[i] = BigInteger.ONE;
61 return tmp;
62 }
63
64 public BigInteger getDegree() {
65 return BigInteger.ONE;
66 }
67
68 /**
69 * Creates a brand new clause, presumably from external data. Performs all
70 * sanity checks.
71 *
72 * @param s
73 * the object responsible for unit propagation
74 * @param voc
75 * the vocabulary
76 * @param literals
77 * the literals to store in the clause
78 * @return the created clause or null if the clause should be ignored
79 * (tautology for example)
80 */
81 public static OriginalHTClausePB brandNewClause(UnitPropagationListener s,
82 ILits voc, IVecInt literals) {
83 OriginalHTClausePB c = new OriginalHTClausePB(literals, voc);
84 c.register();
85 return c;
86 }
87
88 }