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.constraints;
29
30 import java.io.Serializable;
31
32 import org.sat4j.core.Vec;
33 import org.sat4j.minisat.core.Constr;
34 import org.sat4j.minisat.core.DataStructureFactory;
35 import org.sat4j.minisat.core.ILits;
36 import org.sat4j.minisat.core.Learner;
37 import org.sat4j.minisat.core.Propagatable;
38 import org.sat4j.minisat.core.UnitPropagationListener;
39 import org.sat4j.specs.ContradictionException;
40 import org.sat4j.specs.IVec;
41 import org.sat4j.specs.IVecInt;
42
43 /**
44 * @author leberre To change the template for this generated type comment go to
45 * Window>Preferences>Java>Code Generation>Code and Comments
46 */
47 public abstract class AbstractDataStructureFactory<L extends ILits> implements
48 DataStructureFactory<L>, Serializable {
49
50 /**
51 *
52 */
53 private static final long serialVersionUID = 1L;
54
55 /*
56 * (non-Javadoc)
57 *
58 * @see org.sat4j.minisat.core.DataStructureFactory#conflictDetectedInWatchesFor(int)
59 */
60 public void conflictDetectedInAttachesFor(int p, int i) {
61 for (int j = i + 1; j < tmp.size(); j++) {
62 lits.attach(p, tmp.get(j));
63 }
64 }
65
66 /*
67 * (non-Javadoc)
68 *
69 * @see org.sat4j.minisat.core.DataStructureFactory#getWatchesFor(int)
70 */
71 public IVec<Propagatable> getAttachesFor(int p) {
72 tmp.clear();
73 lits.attaches(p).moveTo(tmp);
74 return tmp;
75 }
76
77 protected L lits;
78
79 protected AbstractDataStructureFactory() {
80 lits = createLits();
81 }
82
83 protected abstract L createLits();
84
85 private final IVec<Propagatable> tmp = new Vec<Propagatable>();
86
87 /*
88 * (non-Javadoc)
89 *
90 * @see org.sat4j.minisat.DataStructureFactory#createVocabulary()
91 */
92 public L getVocabulary() {
93 return lits;
94 }
95
96 protected UnitPropagationListener solver;
97
98 protected Learner learner;
99
100 public void setUnitPropagationListener(UnitPropagationListener s) {
101 solver = s;
102 }
103
104 public void setLearner(Learner learner) {
105 this.learner = learner;
106 }
107
108 public void reset() {
109 }
110
111 public void learnConstraint(Constr constr) {
112 learner.learn(constr);
113 }
114
115 /*
116 * (non-Javadoc)
117 *
118 * @see org.sat4j.minisat.core.DataStructureFactory#createCardinalityConstraint(org.sat4j.specs.VecInt,
119 * int)
120 */
121 public Constr createCardinalityConstraint(IVecInt literals, int degree)
122 throws ContradictionException {
123 throw new UnsupportedOperationException();
124 }
125 }