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 }