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.LearntHTClause; 33 import org.sat4j.minisat.core.ILits; 34 import org.sat4j.minisat.core.UnitPropagationListener; 35 import org.sat4j.specs.IVecInt; 36 37 public class LearntHTClausePB extends LearntHTClause implements PBConstr { 38 39 private static final long serialVersionUID = 1L; 40 41 public LearntHTClausePB(IVecInt ps, ILits voc) { 42 super(ps, voc); 43 } 44 45 @Override 46 public void assertConstraint(UnitPropagationListener s) { 47 if (getVocabulary().isUnassigned(head)) { 48 s.enqueue(head, this); 49 } else if (getVocabulary().isUnassigned(tail)) { 50 s.enqueue(tail, this); 51 } else { 52 for (int i = 0; i < middleLits.length; i++) { 53 if (getVocabulary().isUnassigned(middleLits[i])) { 54 int temp = middleLits[i]; 55 middleLits[i] = head; 56 head = temp; 57 s.enqueue(temp, this); 58 break; 59 } 60 } 61 } 62 } 63 64 public IVecInt computeAnImpliedClause() { 65 return null; 66 } 67 68 public BigInteger getCoef(int literal) { 69 return BigInteger.ONE; 70 } 71 72 public BigInteger[] getCoefs() { 73 BigInteger[] tmp = new BigInteger[size()]; 74 for (int i = 0; i < tmp.length; i++) 75 tmp[i] = BigInteger.ONE; 76 return tmp; 77 } 78 79 public BigInteger getDegree() { 80 return BigInteger.ONE; 81 } 82 83 }