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1   /*******************************************************************************
2    * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
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   * Contributors:
28   *   CRIL - initial API and implementation
29   *******************************************************************************/
30  package org.sat4j.pb.constraints.pb;
31  
32  import java.math.BigInteger;
33  
34  import org.sat4j.minisat.constraints.cnf.OriginalHTClause;
35  import org.sat4j.minisat.core.ILits;
36  import org.sat4j.specs.IVecInt;
37  import org.sat4j.specs.UnitPropagationListener;
38  
39  public final class OriginalHTClausePB extends OriginalHTClause implements
40          PBConstr {
41  
42      public OriginalHTClausePB(IVecInt ps, ILits voc) {
43          super(ps, voc);
44      }
45  
46      /**
47       * 
48       */
49      private static final long serialVersionUID = 1L;
50  
51      public IVecInt computeAnImpliedClause() {
52          return null;
53      }
54  
55      public BigInteger getCoef(int literal) {
56          return BigInteger.ONE;
57      }
58  
59      public BigInteger[] getCoefs() {
60          BigInteger[] tmp = new BigInteger[size()];
61          for (int i = 0; i < tmp.length; i++) {
62              tmp[i] = BigInteger.ONE;
63          }
64          return tmp;
65      }
66  
67      public BigInteger getDegree() {
68          return BigInteger.ONE;
69      }
70  
71      /**
72       * Creates a brand new clause, presumably from external data. Performs all
73       * sanity checks.
74       * 
75       * @param s
76       *            the object responsible for unit propagation
77       * @param voc
78       *            the vocabulary
79       * @param literals
80       *            the literals to store in the clause
81       * @return the created clause or null if the clause should be ignored
82       *         (tautology for example)
83       */
84      public static OriginalHTClausePB brandNewClause(UnitPropagationListener s,
85              ILits voc, IVecInt literals) {
86          OriginalHTClausePB c = new OriginalHTClausePB(literals, voc);
87          c.register();
88          return c;
89      }
90  
91  }