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;
31
32 import java.math.BigInteger;
33
34 import org.sat4j.minisat.core.Constr;
35 import org.sat4j.minisat.core.ILits;
36 import org.sat4j.pb.constraints.pb.IDataStructurePB;
37 import org.sat4j.pb.constraints.pb.MaxWatchPb;
38 import org.sat4j.pb.constraints.pb.MaxWatchPbLong;
39 import org.sat4j.specs.ContradictionException;
40 import org.sat4j.specs.UnitPropagationListener;
41
42 public class MaxLongWatchPBConstructor implements IPBConstructor {
43
44 public Constr constructLearntPB(ILits voc, IDataStructurePB dspb) {
45 if (dspb.isLongSufficient()) {
46 return MaxWatchPbLong.normalizedWatchPbNew(voc, dspb);
47 }
48 return MaxWatchPb.normalizedWatchPbNew(voc, dspb);
49 }
50
51 public Constr constructPB(UnitPropagationListener solver, ILits voc,
52 int[] theLits, BigInteger[] coefs, BigInteger degree,
53 BigInteger sumCoefs) throws ContradictionException {
54 if (sumCoefs.bitLength() < Long.SIZE) {
55 return MaxWatchPbLong.normalizedMaxWatchPbNew(solver, voc, theLits,
56 coefs, degree, sumCoefs);
57 }
58 return MaxWatchPb.normalizedMaxWatchPbNew(solver, voc, theLits, coefs,
59 degree, sumCoefs);
60 }
61
62 // public static boolean isLongSufficient(BigInteger[] coefs, BigInteger
63 // degree) {
64 // BigInteger somCoefs = BigInteger.ZERO;
65 // for (int i = 0; somCoefs.bitLength() < Long.SIZE && i < coefs.length;
66 // i++)
67 // somCoefs = somCoefs.add(coefs[i]);
68 // return somCoefs.bitLength() < Long.SIZE;
69 // }
70
71 }