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 pseudo boolean algorithms described in: 20 * A fast pseudo-Boolean constraint solver Chai, D.; Kuehlmann, A. 21 * Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on 22 * Volume 24, Issue 3, March 2005 Page(s): 305 - 317 23 * 24 * and 25 * Heidi E. Dixon, 2004. Automating Pseudo-Boolean Inference within a DPLL 26 * Framework. Ph.D. Dissertation, University of Oregon. 27 *******************************************************************************/ 28 package org.sat4j.pb.constraints.pb; 29 30 import java.math.BigInteger; 31 32 import org.sat4j.minisat.constraints.cnf.MixableCBClause; 33 import org.sat4j.minisat.core.ILits; 34 import org.sat4j.minisat.core.UnitPropagationListener; 35 import org.sat4j.specs.IVecInt; 36 37 public class MixableCBClausePB extends MixableCBClause implements PBConstr { 38 39 /** 40 * 41 */ 42 private static final long serialVersionUID = 1L; 43 44 public MixableCBClausePB(IVecInt ps, ILits voc, boolean learnt) { 45 super(ps, voc, learnt); 46 } 47 48 public MixableCBClausePB(IVecInt ps, ILits voc) { 49 super(ps, voc); 50 } 51 52 public static MixableCBClausePB brandNewClause(UnitPropagationListener s, 53 ILits voc, IVecInt literals) { 54 MixableCBClausePB c = new MixableCBClausePB(literals, voc); 55 c.register(); 56 return c; 57 } 58 59 /* 60 * (non-Javadoc) 61 * 62 * @see org.sat4j.minisat.constraints.pb.PBConstr#computeAnImpliedClause() 63 */ 64 public IVecInt computeAnImpliedClause() { 65 return null; 66 } 67 68 /* 69 * (non-Javadoc) 70 * 71 * @see org.sat4j.minisat.constraints.pb.PBConstr#getCoef(int) 72 */ 73 public BigInteger getCoef(int literal) { 74 return BigInteger.ONE; 75 } 76 77 /* 78 * (non-Javadoc) 79 * 80 * @see org.sat4j.minisat.constraints.pb.PBConstr#getCoefs() 81 */ 82 public BigInteger[] getCoefs() { 83 BigInteger[] tmp = new BigInteger[size()]; 84 for (int i = 0; i < tmp.length; i++) 85 tmp[i] = BigInteger.ONE; 86 return tmp; 87 } 88 89 /* 90 * (non-Javadoc) 91 * 92 * @see org.sat4j.minisat.constraints.pb.PBConstr#getDegree() 93 */ 94 public BigInteger getDegree() { 95 return BigInteger.ONE; 96 } 97 98 /* 99 * (non-Javadoc) 100 * 101 * @see org.sat4j.minisat.constraints.pb.PBConstr#getLits() 102 */ 103 public int[] getLits() { 104 int[] tmp = new int[size()]; 105 System.arraycopy(lits, 0, tmp, 0, size()); 106 return tmp; 107 } 108 109 /* 110 * (non-Javadoc) 111 * 112 * @see org.sat4j.minisat.constraints.pb.PBConstr#getVocabulary() 113 */ 114 public ILits getVocabulary() { 115 return voc; 116 } 117 118 /* 119 * (non-Javadoc) 120 * 121 * @see org.sat4j.minisat.core.Constr#assertConstraint(org.sat4j.minisat.core.UnitPropagationListener) 122 */ 123 @Override 124 public void assertConstraint(UnitPropagationListener s) { 125 for (int i = 0; i < size(); i++) 126 if (getVocabulary().isUnassigned(get(i))) { 127 boolean ret = s.enqueue(get(i), this); 128 assert ret; 129 break; 130 } 131 } 132 133 }