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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.ConditionalProofVo;
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 conditional proof rule usage.
26   *
27   * @author  Michael Meyling
28   */
29  public class ConditionalProofHandler extends AbstractSimpleHandler {
30  
31      /** Rule value object. */
32      private ConditionalProofVo conditionalProof;
33  
34      /** Handle hypothesis. */
35      private HypothesisHandler hypothesisHandler;
36  
37      /** Handle elements. */
38      private FormalProofLineListHandler proofListHandler;
39  
40      /** Handle hypothesis. */
41      private ConclusionHandler conclusionHandler;
42  
43      /**
44       * Deals with definitions.
45       *
46       * @param   handler Parent handler.
47       */
48      public ConditionalProofHandler(final AbstractSimpleHandler handler) {
49          super(handler, "CP");
50      }
51  
52      public final void init() {
53          conditionalProof = null;
54          // we initialize the parsers only when really needed (so we have no recursive calls)
55          hypothesisHandler = new HypothesisHandler(this);
56          proofListHandler = new FormalProofLineListHandler(this);
57          conclusionHandler = new ConclusionHandler(this);
58      }
59  
60      /**
61       * Get conditional proof usage.
62       *
63       * @return  Substitute Free Variable usage.
64       */
65      public final ConditionalProofVo getConditionalProofVo() {
66          return conditionalProof;
67      }
68  
69      public final void startElement(final String name, final SimpleAttributes attributes)
70              throws XmlSyntaxException {
71          if (getStartTag().equals(name)) {
72              // ok
73          } else if (hypothesisHandler.getStartTag().equals(name)) {
74              changeHandler(hypothesisHandler, name, attributes);
75          } else if (proofListHandler.getStartTag().equals(name)) {
76              changeHandler(proofListHandler, name, attributes);
77          } else if (conclusionHandler.getStartTag().equals(name)) {
78              changeHandler(conclusionHandler, name, attributes);
79          } else {
80              throw XmlSyntaxException.createUnexpectedTagException(name);
81          }
82      }
83  
84      public final void endElement(final String name) throws XmlSyntaxException {
85          if (getStartTag().equals(name)) {
86              conditionalProof = new ConditionalProofVo(hypothesisHandler.getHypothesis(),
87                  proofListHandler.getFormalProofLineList(),
88                  conclusionHandler.getConclusion());
89          } else if (hypothesisHandler.getStartTag().equals(name)) {
90              // ok
91          } else if (proofListHandler.getStartTag().equals(name)) {
92              // ok
93          } else if (conclusionHandler.getStartTag().equals(name)) {
94              // ok
95          } else {
96              throw XmlSyntaxException.createUnexpectedTagException(name);
97          }
98      }
99  
100 }