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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  
36  /**
37   * Disable restarts in the solver.
38   * 
39   * @author leberre
40   * 
41   */
42  public final class NoRestarts implements RestartStrategy {
43  
44      private static final long serialVersionUID = 1L;
45  
46      public void init(SearchParams params) {
47          // nothing to do
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 SearchParams getSearchParams() {
80          return new SearchParams();
81      }
82  
83      public void newLearnedClause(Constr learned, int trailLevel) {
84      }
85  }