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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.base.module.Axiom;
19  import org.qedeq.kernel.se.dto.module.AxiomVo;
20  import org.qedeq.kernel.xml.common.XmlSyntaxException;
21  import org.qedeq.kernel.xml.handler.common.AbstractSimpleHandler;
22  import org.qedeq.kernel.xml.handler.common.SimpleAttributes;
23  
24  
25  /**
26   * Parse an axiom.
27   *
28   * @version $Revision: 1.1 $
29   * @author  Michael Meyling
30   */
31  public class AxiomHandler extends AbstractSimpleHandler {
32  
33      /** Handler for axiom formula. */
34      private final FormulaHandler formulaHandler;
35  
36      /** Handler for rule description. */
37      private final LatexListHandler descriptionHandler;
38  
39      /** Axiom value object. */
40      private AxiomVo axiom;
41  
42      /**
43       * Deals with axioms.
44       *
45       * @param   handler Parent handler.
46       */
47      public AxiomHandler(final AbstractSimpleHandler handler) {
48          super(handler, "AXIOM");
49          formulaHandler = new FormulaHandler(this);
50          descriptionHandler = new LatexListHandler(this, "DESCRIPTION");
51      }
52  
53      public final void init() {
54          axiom = null;
55      }
56  
57      /**
58       * Get axiom.
59       *
60       * @return  Axiom.
61       */
62      public final Axiom getAxiom() {
63          return axiom;
64      }
65  
66      public final void startElement(final String name, final SimpleAttributes attributes)
67              throws XmlSyntaxException {
68          if (getStartTag().equals(name)) {
69              axiom = new AxiomVo();
70              axiom.setDefinedOperator(attributes.getString("definedOperator"));
71          } else if (formulaHandler.getStartTag().equals(name)) {
72              changeHandler(formulaHandler, name, attributes);
73          } else if (descriptionHandler.getStartTag().equals(name)) {
74              changeHandler(descriptionHandler, name, attributes);
75          } else {
76              throw XmlSyntaxException.createUnexpectedTagException(name);
77          }
78      }
79  
80      public final void endElement(final String name) throws XmlSyntaxException {
81          if (getStartTag().equals(name)) {
82              // nothing to do
83          } else if (formulaHandler.getStartTag().equals(name)) {
84              axiom.setFormula(formulaHandler.getFormula());
85          } else if (descriptionHandler.getStartTag().equals(name)) {
86              axiom.setDescription(descriptionHandler.getLatexList());
87          } else {
88              throw XmlSyntaxException.createUnexpectedTagException(name);
89          }
90      }
91  
92  }