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.minisat.core;
29
30 import org.sat4j.specs.ContradictionException;
31 import org.sat4j.specs.IVec;
32 import org.sat4j.specs.IVecInt;
33
34 /**
35 * The aim of the factory is to provide a concrete implementation of clauses,
36 * cardinality constraints and pseudo boolean consraints.
37 *
38 * @author leberre
39 */
40 public interface DataStructureFactory {
41
42 /**
43 * @param literals
44 * a set of literals using Dimacs format (signed non null
45 * integers).
46 * @return null if the constraint is a tautology.
47 * @throws ContradictionException
48 * the constraint is trivially unsatisfiable.
49 * @throws UnsupportedOperationException
50 * there is no concrete implementation for that constraint.
51 */
52 Constr createClause(IVecInt literals) throws ContradictionException;
53
54 Constr createUnregisteredClause(IVecInt literals);
55
56 void learnConstraint(Constr constr);
57
58 /**
59 * Create a cardinality constraint of the form sum li >= degree.
60 *
61 * @param literals
62 * a set of literals.
63 * @param degree
64 * the degree of the cardinality constraint.
65 * @return a constraint stating that at least degree literals are satisfied.
66 * @throws ContradictionException
67 */
68 Constr createCardinalityConstraint(IVecInt literals, int degree)
69 throws ContradictionException;
70
71 void setUnitPropagationListener(UnitPropagationListener s);
72
73 void setLearner(Learner l);
74
75 void reset();
76
77 ILits getVocabulary();
78
79 /**
80 * @param p
81 * @return a vector containing all the objects to be notified of the
82 * satisfaction of that literal.
83 */
84 IVec<Propagatable> getWatchesFor(int p);
85
86 /**
87 * @param p
88 * @param i
89 * the index of the conflicting constraint
90 */
91 void conflictDetectedInWatchesFor(int p, int i);
92 }