1 /*
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2006 Daniel Le Berre
3 *
4 * Based on the original minisat specification from:
5 *
6 * An extensible SAT solver. Niklas E?n and Niklas S?rensson. Proceedings of the
7 * Sixth International Conference on Theory and Applications of Satisfiability
8 * Testing, LNCS 2919, pp 502-518, 2003.
9 *
10 * This library is free software; you can redistribute it and/or modify it under
11 * the terms of the GNU Lesser General Public License as published by the Free
12 * Software Foundation; either version 2.1 of the License, or (at your option)
13 * any later version.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
18 * details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25 package org.sat4j.reader.csp;
26
27 import org.sat4j.core.VecInt;
28 import org.sat4j.specs.ContradictionException;
29 import org.sat4j.specs.ISolver;
30 import org.sat4j.specs.IVecInt;
31
32 public class Var implements Evaluable {
33
34 private final Domain domain;
35
36 private final String id;
37
38 private final int startid;
39
40 public Var(String idvar, Domain domain, int lastvarnumber) {
41 this.domain = domain;
42 this.id = idvar;
43 this.startid = lastvarnumber + 1;
44 }
45
46 /*
47 * (non-Javadoc)
48 *
49 * @see org.sat4j.reader.csp.Evaluable#domain()
50 */
51 public Domain domain() {
52 return domain;
53 }
54
55 /*
56 * (non-Javadoc)
57 *
58 * @see org.sat4j.reader.csp.Evaluable#translate(int)
59 */
60 public int translate(int key) {
61 return domain.pos(key) + startid;
62 }
63
64 /*
65 * (non-Javadoc)
66 *
67 * @see org.sat4j.reader.csp.Evaluable#toClause(org.sat4j.specs.ISolver)
68 */
69 public void toClause(ISolver solver) throws ContradictionException {
70 IVecInt clause = new VecInt(domain.size());
71 for (int i = 0; i < domain.size(); i++)
72 clause.push(i + startid);
73 solver.addClause(clause);
74 solver.addAtMost(clause, 1);
75 }
76
77 public int findValue(int[] model) {
78 for (int i = 0; i < domain.size(); i++) {
79 int varnum = i + startid;
80 if (model[varnum - 1] == varnum)
81 return domain.get(i);
82 }
83 throw new RuntimeException("BIG PROBLEM: no value for a var!");
84 }
85
86 /*
87 * (non-Javadoc)
88 *
89 * @see java.lang.Object#toString()
90 */
91 @Override
92 public String toString() {
93 return id;
94 }
95
96 }