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1   /*******************************************************************************
2   * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
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 pseudo boolean algorithms described in:
20  * A fast pseudo-Boolean constraint solver Chai, D.; Kuehlmann, A.
21  * Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
22  * Volume 24, Issue 3, March 2005 Page(s): 305 - 317
23  * 
24  * and 
25  * Heidi E. Dixon, 2004. Automating Pseudo-Boolean Inference within a DPLL 
26  * Framework. Ph.D. Dissertation, University of Oregon.
27  *******************************************************************************/
28  package org.sat4j.pb.reader;
29  
30  import java.io.IOException;
31  
32  import org.sat4j.pb.IPBSolver;
33  import org.sat4j.reader.ParseFormatException;
34  import org.sat4j.specs.ContradictionException;
35  
36  /**
37   * Reader complying to the PB06 input format.
38   * 
39   * @author leberre
40   * 
41   */
42  public class OPBReader2006 extends OPBReader2005 {
43  
44      /**
45       * 
46       */
47      private static final long serialVersionUID = 1L;
48  
49      public OPBReader2006(IPBSolver solver) {
50          super(solver);
51      }
52  
53      /**
54       * read a term into coeff and var
55       * 
56       * @param coeff
57       *            the coefficient of the variable
58       * @param var
59       *            the indentifier we read
60       * @throws IOException
61       * @throws ParseException
62       */
63      @Override
64      protected void readTerm(StringBuffer coeff, StringBuffer var)
65              throws IOException, ParseFormatException, ContradictionException {
66          readInteger(coeff);
67  
68          skipSpaces();
69  
70          if (!readIdentifier(var))
71              throw new ParseFormatException("identifier expected");
72      }
73  }