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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 pseudo boolean algorithms described in:
20  * A fast pseudo-Boolean constraint solver Chai, D.; Kuehlmann, A.
21  * Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
22  * Volume 24, Issue 3, March 2005 Page(s): 305 - 317
23  * 
24  * and 
25  * Heidi E. Dixon, 2004. Automating Pseudo-Boolean Inference within a DPLL 
26  * Framework. Ph.D. Dissertation, University of Oregon.
27  *******************************************************************************/
28  package org.sat4j.pb.constraints;
29  
30  import java.math.BigInteger;
31  
32  import org.sat4j.core.Vec;
33  import org.sat4j.core.VecInt;
34  import org.sat4j.pb.constraints.pb.BinaryClausePB;
35  import org.sat4j.pb.constraints.pb.HTClausePB;
36  import org.sat4j.pb.constraints.pb.IDataStructurePB;
37  import org.sat4j.pb.constraints.pb.MinWatchCardPB;
38  import org.sat4j.pb.constraints.pb.MinWatchPb;
39  import org.sat4j.pb.constraints.pb.PBConstr;
40  import org.sat4j.pb.constraints.pb.PuebloMinWatchPb;
41  import org.sat4j.pb.constraints.pb.UnitClausePB;
42  import org.sat4j.specs.ContradictionException;
43  import org.sat4j.specs.IVec;
44  import org.sat4j.specs.IVecInt;
45  
46  public class PuebloPBMinClauseCardConstrDataStructure extends
47          AbstractPBClauseCardConstrDataStructure {
48  
49      /**
50       * 
51       */
52      private static final long serialVersionUID = 1L;
53  
54      @Override
55      protected PBConstr constructClause(IVecInt v) throws ContradictionException {
56      	if (v.size()==2) {
57          	return BinaryClausePB.brandNewClause(solver, getVocabulary(), v);
58          }
59          return HTClausePB.brandNewClause(solver, getVocabulary(), v);
60      }
61  
62      @Override
63      protected PBConstr constructCard(IVecInt theLits, int degree)
64              throws ContradictionException {
65          return MinWatchCardPB.normalizedMinWatchCardPBNew(solver,
66                  getVocabulary(), theLits, degree);
67      }
68  
69      @Override
70      protected PBConstr constructPB(IDataStructurePB mpb)
71              throws ContradictionException {
72          return MinWatchPb.normalizedMinWatchPbNew(solver, getVocabulary(), mpb);
73      }
74  
75      @Override
76      protected PBConstr constructPB(int[] theLits, BigInteger[] coefs, BigInteger degree)
77              throws ContradictionException {
78          return MinWatchPb.normalizedMinWatchPbNew(solver, getVocabulary(), theLits, coefs, degree);
79      }
80  
81      @Override
82      protected PBConstr constructLearntClause(IVecInt literals) {
83      	if (literals.size()==1)
84      		return new UnitClausePB(literals.last());
85      	if (literals.size()==2)
86      		return new BinaryClausePB(literals,getVocabulary());
87          return new HTClausePB(literals, getVocabulary());
88      }
89  
90      @Override
91      protected PBConstr constructLearntCard(IVecInt literals, int degree) {
92          return new MinWatchCardPB(getVocabulary(), literals, true, degree);
93      }
94  
95      @Override
96      protected PBConstr constructLearntPB(IVecInt literals,
97              IVec<BigInteger> coefs, BigInteger degree) {
98          return PuebloMinWatchPb.watchPbNew(getVocabulary(), literals, coefs,
99                  true, degree);
100     }
101 
102     @Override
103     protected PBConstr constructLearntClause(IDataStructurePB dspb) {
104         IVecInt resLits = new VecInt();
105         IVec<BigInteger> resCoefs = new Vec<BigInteger>();
106         dspb.buildConstraintFromConflict(resLits, resCoefs);
107         if (resLits.size()==1)
108     		return new UnitClausePB(resLits.last());
109         if (resLits.size()==2)
110     		return new BinaryClausePB(resLits,getVocabulary());
111         return new HTClausePB(resLits, getVocabulary());
112     }
113 
114     @Override
115     protected PBConstr constructLearntCard(IDataStructurePB dspb) {
116         IVecInt resLits = new VecInt();
117         IVec<BigInteger> resCoefs = new Vec<BigInteger>();
118         dspb.buildConstraintFromConflict(resLits, resCoefs);
119         return new MinWatchCardPB(getVocabulary(), resLits, true, dspb.getDegree().intValue());
120     }
121 
122     @Override
123     protected PBConstr constructLearntPB(IDataStructurePB dspb) {
124         return PuebloMinWatchPb.normalizedWatchPbNew(getVocabulary(),dspb);
125     }
126 
127 }