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 package org.sat4j.minisat.restarts;
31
32 import org.sat4j.minisat.core.Constr;
33 import org.sat4j.minisat.core.RestartStrategy;
34 import org.sat4j.minisat.core.SearchParams;
35 import org.sat4j.minisat.core.SolverStats;
36
37 /**
38 * Disable restarts in the solver.
39 *
40 * @author leberre
41 *
42 */
43 public final class NoRestarts implements RestartStrategy {
44
45 private static final long serialVersionUID = 1L;
46
47 public void init(SearchParams params, SolverStats stats) {
48 }
49
50 public long nextRestartNumberOfConflict() {
51 return Long.MAX_VALUE;
52 }
53
54 public void onRestart() {
55 // do nothing
56 }
57
58 public void reset() {
59 // do nothing
60 }
61
62 public void newConflict() {
63 // do nothing
64 }
65
66 public boolean shouldRestart() {
67 return false;
68 }
69
70 public void onBackjumpToRootLevel() {
71 // do nothing
72 }
73
74 @Override
75 public String toString() {
76 return "NoRestarts";
77 }
78
79 public void newLearnedClause(Constr learned, int trailLevel) {
80 }
81
82 }