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
31 package org.sat4j.pb.tools;
32
33 import java.util.Iterator;
34
35 import org.sat4j.core.Vec;
36 import org.sat4j.core.VecInt;
37 import org.sat4j.specs.ContradictionException;
38 import org.sat4j.specs.IConstr;
39 import org.sat4j.specs.IVec;
40 import org.sat4j.specs.IVecInt;
41
42 /**
43 * That class is used to represent a conjunction of literals in the RHS of an
44 * implication.
45 *
46 * @author daniel
47 *
48 * @param <T>
49 * @param <C>
50 */
51 public class ImplicationAnd<T, C> {
52 private final DependencyHelper<T, C> helper;
53 private final IVecInt clause;
54 private final IVec<IConstr> toName = new Vec<IConstr>();
55
56 public ImplicationAnd(DependencyHelper<T, C> helper, IVecInt clause) {
57 this.clause = clause;
58 this.helper = helper;
59 }
60
61 /**
62 * Add a new positive literal to the conjunction of literals.
63 *
64 * @param thing
65 * a domain object
66 * @return a RHS conjunction of literals.
67 * @throws ContradictionException
68 */
69 public ImplicationAnd<T, C> and(T thing) throws ContradictionException {
70 IVecInt tmpClause = new VecInt();
71 this.clause.copyTo(tmpClause);
72 tmpClause.push(this.helper.getIntValue(thing));
73 IConstr constr = this.helper.solver.addClause(tmpClause);
74 if (constr != null) {
75 this.toName.push(constr);
76 }
77 return this;
78 }
79
80 /**
81 * Add a new negative literal to the conjunction of literals.
82 *
83 * @param thing
84 * a domain object
85 * @return a RHS conjunction of literals.
86 * @throws ContradictionException
87 */
88 public ImplicationAnd<T, C> andNot(T thing) throws ContradictionException {
89 IVecInt tmpClause = new VecInt();
90 this.clause.copyTo(tmpClause);
91 tmpClause.push(-this.helper.getIntValue(thing));
92 IConstr constr = this.helper.solver.addClause(tmpClause);
93 if (constr != null) {
94 this.toName.push(constr);
95 }
96 return this;
97 }
98
99 /**
100 * "name" the constraint for the explanation.
101 *
102 * IT IS MANDATORY TO NAME ALL THE CONSTRAINTS!
103 *
104 * @param name
105 * an object to link to the constraint.
106 */
107 public void named(C name) {
108 for (Iterator<IConstr> it = this.toName.iterator(); it.hasNext();) {
109 this.helper.descs.put(it.next(), name);
110 }
111 }
112 }