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
26 package org.sat4j.minisat.constraints.cnf;
27
28 import org.sat4j.minisat.core.ILits23;
29
30 /**
31 * @author leberre To change the template for this generated type comment go to
32 * Window - Preferences - Java - Code Generation - Code and Comments
33 */
34 public class Lits23 extends Lits2 implements ILits23 {
35
36 private static final long serialVersionUID = 1L;
37
38 private TernaryClauses[] ternclauses = null;
39
40 /**
41 *
42 */
43 public Lits23() {
44 super();
45 }
46
47 private void register(int p, int q, int r) {
48 assert p > 1;
49 assert q > 1;
50 assert r > 1;
51
52 if (ternclauses == null) {
53 ternclauses = new TernaryClauses[2 * nVars() + 2];
54 }
55 if (ternclauses[p] == null) {
56 ternclauses[p] = new TernaryClauses(this, p);
57 watches[p ^ 1].push(ternclauses[p]);
58 }
59 ternclauses[p].addTernaryClause(q, r);
60 }
61
62 public void ternaryClauses(int lit1, int lit2, int lit3) {
63 register(lit1, lit2, lit3);
64 register(lit2, lit1, lit3);
65 register(lit3, lit1, lit2);
66 }
67
68 public int nTernaryClauses(int p) {
69 if (ternclauses == null) {
70 return 0;
71 }
72 if (ternclauses[p] == null) {
73 return 0;
74 }
75 return ternclauses[p].size();
76 }
77 }