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.minisat.core; 31 32 import org.sat4j.specs.ContradictionException; 33 import org.sat4j.specs.IVec; 34 import org.sat4j.specs.IVecInt; 35 36 /** 37 * The aim of the factory is to provide a concrete implementation of clauses, 38 * cardinality constraints and pseudo boolean consraints. 39 * 40 * @author leberre 41 */ 42 public interface DataStructureFactory { 43 44 /** 45 * @param literals 46 * a set of literals using Dimacs format (signed non null 47 * integers). 48 * @return null if the constraint is a tautology. 49 * @throws ContradictionException 50 * the constraint is trivially unsatisfiable. 51 * @throws UnsupportedOperationException 52 * there is no concrete implementation for that constraint. 53 */ 54 Constr createClause(IVecInt literals) throws ContradictionException; 55 56 Constr createUnregisteredClause(IVecInt literals); 57 58 void learnConstraint(Constr constr); 59 60 /** 61 * Create a cardinality constraint of the form sum li >= degree. 62 * 63 * @param literals 64 * a set of literals. 65 * @param degree 66 * the degree of the cardinality constraint. 67 * @return a constraint stating that at least degree literals are satisfied. 68 * @throws ContradictionException 69 */ 70 Constr createCardinalityConstraint(IVecInt literals, int degree) 71 throws ContradictionException; 72 73 void setUnitPropagationListener(UnitPropagationListener s); 74 75 void setLearner(Learner l); 76 77 void reset(); 78 79 ILits getVocabulary(); 80 81 /** 82 * @param p 83 * @return a vector containing all the objects to be notified of the 84 * satisfaction of that literal. 85 */ 86 IVec<Propagatable> getWatchesFor(int p); 87 88 /** 89 * @param p 90 * @param i 91 * the index of the conflicting constraint 92 */ 93 void conflictDetectedInWatchesFor(int p, int i); 94 }