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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;
29  
30  import org.sat4j.core.VecInt;
31  import org.sat4j.specs.ContradictionException;
32  import org.sat4j.specs.IVecInt;
33  
34  /**
35   * A decorator that computes all pseudo boolean models. It doesn't provide the
36   * minimal solution for the objective function.
37   * 
38   * @author anne
39   * 
40   */
41  public class PseudoIteratorDecorator extends PseudoOptDecorator {
42  
43  	/**
44  	 * 
45  	 */
46  	private static final long serialVersionUID = 1L;
47  
48  	public PseudoIteratorDecorator(IPBSolver solver) {
49  		super(solver);
50  	}
51  
52  	@Override
53  	public void discardCurrentSolution() throws ContradictionException {
54  		int[] last = super.model();
55  		IVecInt clause = new VecInt(last.length);
56  		for (int q : last) {
57  			clause.push(-q);
58  		}
59  		addClause(clause);
60  	}
61  
62  }