View Javadoc

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 original MiniSat specification from:
20   * 
21   * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22   * Sixth International Conference on Theory and Applications of Satisfiability
23   * Testing, LNCS 2919, pp 502-518, 2003.
24   *
25   * See www.minisat.se for the original solver in C++.
26   * 
27   *******************************************************************************/
28  package org.sat4j.pb.constraints.pb;
29  
30  import java.math.BigInteger;
31  
32  import org.sat4j.minisat.constraints.cnf.OriginalHTClause;
33  import org.sat4j.minisat.core.ILits;
34  import org.sat4j.minisat.core.UnitPropagationListener;
35  import org.sat4j.specs.IVecInt;
36  
37  public final class OriginalHTClausePB extends OriginalHTClause implements
38  		PBConstr {
39  
40  	public OriginalHTClausePB(IVecInt ps, ILits voc) {
41  		super(ps, voc);
42  	}
43  
44  	/**
45       * 
46       */
47  	private static final long serialVersionUID = 1L;
48  
49  	public IVecInt computeAnImpliedClause() {
50  		return null;
51  	}
52  
53  	public BigInteger getCoef(int literal) {
54  		return BigInteger.ONE;
55  	}
56  
57  	public BigInteger[] getCoefs() {
58  		BigInteger[] tmp = new BigInteger[size()];
59  		for (int i = 0; i < tmp.length; i++)
60  			tmp[i] = BigInteger.ONE;
61  		return tmp;
62  	}
63  
64  	public BigInteger getDegree() {
65  		return BigInteger.ONE;
66  	}
67  
68  	/**
69  	 * Creates a brand new clause, presumably from external data. Performs all
70  	 * sanity checks.
71  	 * 
72  	 * @param s
73  	 *            the object responsible for unit propagation
74  	 * @param voc
75  	 *            the vocabulary
76  	 * @param literals
77  	 *            the literals to store in the clause
78  	 * @return the created clause or null if the clause should be ignored
79  	 *         (tautology for example)
80  	 */
81  	public static OriginalHTClausePB brandNewClause(UnitPropagationListener s,
82  			ILits voc, IVecInt literals) {
83  		OriginalHTClausePB c = new OriginalHTClausePB(literals, voc);
84  		c.register();
85  		return c;
86  	}
87  
88  }