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.LearntHTClause; 35 import org.sat4j.minisat.core.ILits; 36 import org.sat4j.specs.IVecInt; 37 import org.sat4j.specs.UnitPropagationListener; 38 39 public final class LearntHTClausePB extends LearntHTClause implements PBConstr { 40 41 private static final long serialVersionUID = 1L; 42 43 public LearntHTClausePB(IVecInt ps, ILits voc) { 44 super(ps, voc); 45 } 46 47 @Override 48 public void assertConstraint(UnitPropagationListener s) { 49 if (getVocabulary().isUnassigned(this.head)) { 50 s.enqueue(this.head, this); 51 } else if (getVocabulary().isUnassigned(this.tail)) { 52 s.enqueue(this.tail, this); 53 } else { 54 for (int i = 0; i < this.middleLits.length; i++) { 55 if (getVocabulary().isUnassigned(this.middleLits[i])) { 56 int temp = this.middleLits[i]; 57 this.middleLits[i] = this.head; 58 this.head = temp; 59 s.enqueue(temp, this); 60 break; 61 } 62 } 63 } 64 } 65 66 public IVecInt computeAnImpliedClause() { 67 return null; 68 } 69 70 public BigInteger getCoef(int literal) { 71 return BigInteger.ONE; 72 } 73 74 public BigInteger[] getCoefs() { 75 BigInteger[] tmp = new BigInteger[size()]; 76 for (int i = 0; i < tmp.length; i++) { 77 tmp[i] = BigInteger.ONE; 78 } 79 return tmp; 80 } 81 82 public BigInteger getDegree() { 83 return BigInteger.ONE; 84 } 85 86 }