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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.minisat.core.UnitPropagationListener;
37  import org.sat4j.pb.constraints.pb.IDataStructurePB;
38  import org.sat4j.pb.constraints.pb.MaxWatchPb;
39  import org.sat4j.pb.constraints.pb.MaxWatchPbLong;
40  import org.sat4j.specs.ContradictionException;
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  }