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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.pb.reader;
31  
32  import org.sat4j.pb.IPBSolver;
33  import org.sat4j.reader.InstanceReader;
34  import org.sat4j.reader.Reader;
35  
36  /**
37   * An reader having the responsibility to choose the right reader according to
38   * the input.
39   * 
40   * @author leberre
41   */
42  public class PBInstanceReader extends InstanceReader {
43  
44      private OPBReader2012 opb;
45  
46      private final IPBSolver solver;
47  
48      public PBInstanceReader(IPBSolver solver) {
49          super(solver);
50          this.solver = solver;
51      }
52  
53      private Reader getDefaultOPBReader() {
54          if (this.opb == null) {
55              this.opb = new OPBReader2012(this.solver);
56          }
57          return this.opb;
58      }
59  
60      public boolean hasObjectiveFunction() {
61          return this.opb.hasObjFunc;
62      }
63  
64      @Override
65      protected Reader handleFileName(String fname, String prefix) {
66          if (fname.endsWith(".opb") || "PB".equals(prefix)) {
67              return getDefaultOPBReader();
68          }
69          return super.handleFileName(fname, prefix);
70      }
71  }