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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.minisat.core.Constr;
35  import org.sat4j.pb.constraints.pb.AtLeastPB;
36  import org.sat4j.pb.constraints.pb.IDataStructurePB;
37  import org.sat4j.pb.constraints.pb.PBConstr;
38  import org.sat4j.specs.ContradictionException;
39  import org.sat4j.specs.IVec;
40  import org.sat4j.specs.IVecInt;
41  
42  public class PBMaxClauseAtLeastConstrDataStructure extends
43  		PBMaxClauseCardConstrDataStructure {
44  
45  	/**
46       * 
47       */
48  	private static final long serialVersionUID = 1L;
49  
50  	@Override
51  	protected PBConstr constructCard(IVecInt theLits, int degree)
52  			throws ContradictionException {
53  		return AtLeastPB.atLeastNew(solver, getVocabulary(), theLits, degree);
54  	}
55  
56  	@Override
57  	protected Constr constructLearntCard(IDataStructurePB dspb) {
58  		IVecInt resLits = new VecInt();
59  		IVec<BigInteger> resCoefs = new Vec<BigInteger>();
60  		dspb.buildConstraintFromConflict(resLits, resCoefs);
61  		return AtLeastPB.atLeastNew(getVocabulary(), resLits, dspb.getDegree()
62  				.intValue());
63  	}
64  
65  }