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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.pb.constraints.pb.IDataStructurePB;
36  import org.sat4j.pb.constraints.pb.MapPb;
37  import org.sat4j.pb.constraints.pb.MinWatchPb;
38  import org.sat4j.pb.constraints.pb.PBConstr;
39  import org.sat4j.pb.constraints.pb.Pseudos;
40  import org.sat4j.specs.ContradictionException;
41  import org.sat4j.specs.IVec;
42  import org.sat4j.specs.IVecInt;
43  
44  /**
45   * @author leberre To change the template for this generated type comment go to
46   *         Window - Preferences - Java - Code Generation - Code and Comments
47   */
48  public class PBMinDataStructure extends AbstractPBDataStructureFactory {
49  
50      private static final long serialVersionUID = 1L;
51  
52      /*
53       * (non-Javadoc)
54       * 
55       * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
56       * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt,
57       * boolean, int)
58       */
59      @Override
60      protected PBConstr constraintFactory(int[] literals, BigInteger[] coefs,
61              BigInteger degree) throws ContradictionException {
62          return MinWatchPb.normalizedMinWatchPbNew(this.solver, getVocabulary(),
63                  literals, coefs, degree,
64                  AbstractPBClauseCardConstrDataStructure
65                          .sumOfCoefficients(coefs));
66      }
67  
68      /*
69       * (non-Javadoc)
70       * 
71       * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
72       * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt, int)
73       */
74      @Override
75      protected Constr learntConstraintFactory(IDataStructurePB dspb) {
76          return MinWatchPb.normalizedWatchPbNew(getVocabulary(), dspb);
77      }
78  
79      /*
80       * (non-Javadoc)
81       * 
82       * @seeorg.sat4j.minisat.constraints.AbstractPBDataStructureFactory#
83       * constraintFactory(org.sat4j.specs.VecInt, org.sat4j.specs.VecInt, int)
84       */
85      private Constr learntConstraintFactory(IVecInt literals,
86              IVec<BigInteger> coefs, BigInteger degree, boolean moreThan) {
87          int[] lits = new int[literals.size()];
88          literals.copyTo(lits);
89          BigInteger[] bc = new BigInteger[coefs.size()];
90          coefs.copyTo(bc);
91          degree = Pseudos.niceCheckedParametersForCompetition(lits, bc,
92                  moreThan, degree);
93  
94          return MinWatchPb.normalizedWatchPbNew(getVocabulary(), new MapPb(
95                  literals, coefs, degree));
96      }
97  
98      @Override
99      protected Constr learntAtLeastConstraintFactory(IVecInt literals,
100             IVec<BigInteger> coefs, BigInteger degree) {
101         return learntConstraintFactory(literals, coefs, degree, true);
102     }
103 
104     @Override
105     protected Constr learntAtMostConstraintFactory(IVecInt literals,
106             IVec<BigInteger> coefs, BigInteger degree) {
107         return learntConstraintFactory(literals, coefs, degree, false);
108     }
109 
110 }