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.OriginalBinaryClause; 33 import org.sat4j.minisat.core.ILits; 34 import org.sat4j.minisat.core.UnitPropagationListener; 35 import org.sat4j.specs.IVecInt; 36 37 public class OriginalBinaryClausePB extends OriginalBinaryClause implements 38 PBConstr { 39 40 public OriginalBinaryClausePB(IVecInt ps, ILits voc) { 41 super(ps, voc); 42 // TODO Auto-generated constructor stub 43 } 44 45 /** 46 * 47 */ 48 private static final long serialVersionUID = 1L; 49 50 public IVecInt computeAnImpliedClause() { 51 return null; 52 } 53 54 public BigInteger getCoef(int literal) { 55 return BigInteger.ONE; 56 } 57 58 public BigInteger[] getCoefs() { 59 BigInteger[] tmp = new BigInteger[size()]; 60 for (int i = 0; i < tmp.length; i++) 61 tmp[i] = BigInteger.ONE; 62 return tmp; 63 } 64 65 public BigInteger getDegree() { 66 return BigInteger.ONE; 67 } 68 69 /** 70 * Creates a brand new clause, presumably from external data. 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 OriginalBinaryClausePB brandNewClause( 82 UnitPropagationListener s, ILits voc, IVecInt literals) { 83 OriginalBinaryClausePB c = new OriginalBinaryClausePB(literals, voc); 84 c.register(); 85 return c; 86 } 87 88 }