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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.core;
29  
30  import org.sat4j.minisat.core.AssertingClauseGenerator;
31  import org.sat4j.minisat.core.ILits;
32  import org.sat4j.minisat.core.IOrder;
33  import org.sat4j.minisat.core.LearningStrategy;
34  import org.sat4j.pb.constraints.pb.ConflictMapClause;
35  import org.sat4j.pb.constraints.pb.IConflict;
36  import org.sat4j.pb.constraints.pb.PBConstr;
37  
38  public class PBSolverClause extends PBSolverCP<ILits> {
39  
40      /**
41       * 
42       */
43      private static final long serialVersionUID = 1L;
44  
45      public PBSolverClause(AssertingClauseGenerator acg,
46              LearningStrategy<ILits,PBDataStructureFactory<ILits>> learner, PBDataStructureFactory<ILits> dsf, IOrder<ILits> order) {
47          super(acg, learner, dsf, order);
48      }
49  
50      @Override
51      IConflict chooseConflict(PBConstr myconfl, int level) {
52          return ConflictMapClause.createConflict(myconfl, level);
53      }
54  
55      @Override
56      public String toString(String prefix) {
57          return super.toString(prefix) + "\n" + prefix
58                  + "Simplify asserted PB constraints to clauses";
59      }
60  }