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1   /* This file is part of the project "Hilbert II" - http://www.qedeq.org" target="alexandria_uri">http://www.qedeq.org
2    *
3    * Copyright 2000-2014,  Michael Meyling <mime@qedeq.org>.
4    *
5    * "Hilbert II" is free software; you can redistribute
6    * it and/or modify it under the terms of the GNU General Public
7    * License as published by the Free Software Foundation; either
8    * version 2 of the License, or (at your option) any later version.
9    *
10   * This program is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13   * GNU General Public License for more details.
14   */
15  
16  package org.qedeq.kernel.xml.handler.module;
17  
18  import org.qedeq.kernel.se.dto.module.ModusPonensVo;
19  import org.qedeq.kernel.xml.common.XmlSyntaxException;
20  import org.qedeq.kernel.xml.handler.common.AbstractSimpleHandler;
21  import org.qedeq.kernel.xml.handler.common.SimpleAttributes;
22  
23  
24  /**
25   * Parse a Modus Ponens usage.
26   *
27   * @author  Michael Meyling
28   */
29  public class ModusPonensHandler extends AbstractSimpleHandler {
30  
31      /** Rule value object. */
32      private ModusPonensVo modusPonens;
33  
34      /**
35       * Deals with definitions.
36       *
37       * @param   handler Parent handler.
38       */
39      public ModusPonensHandler(final AbstractSimpleHandler handler) {
40          super(handler, "MP");
41      }
42  
43      public final void init() {
44          modusPonens = null;
45      }
46  
47      /**
48       * Get Modus Ponens usage.
49       *
50       * @return  Modus Ponens usage.
51       */
52      public final ModusPonensVo getModusPonensVo() {
53          return modusPonens;
54      }
55  
56      public final void startElement(final String name, final SimpleAttributes attributes)
57              throws XmlSyntaxException {
58          if (getStartTag().equals(name)) {
59              modusPonens = new ModusPonensVo(attributes.getString("ref1"),
60                  attributes.getString("ref2"));
61          } else {
62              throw XmlSyntaxException.createUnexpectedTagException(name);
63          }
64      }
65  
66      public final void endElement(final String name) throws XmlSyntaxException {
67          if (getStartTag().equals(name)) {
68              // nothing to do
69          } else {
70              throw XmlSyntaxException.createUnexpectedTagException(name);
71          }
72      }
73  
74  }