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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.InitialFunctionDefinitionVo;
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  import org.qedeq.kernel.xml.handler.list.ElementHandler;
23  
24  
25  /**
26   * Parse a function definition.
27   *
28   * @author  Michael Meyling
29   */
30  public class InitialFunctionDefinitionHandler extends AbstractSimpleHandler {
31  
32      /** Handler for terms. */
33      private final ElementHandler elementHandler;
34  
35      /** Handler for rule description. */
36      private final LatexListHandler descriptionHandler;
37  
38      /** Definition value object. */
39      private InitialFunctionDefinitionVo definition;
40  
41      /** LaTeX pattern for the definition. */
42      private String latexPattern;
43  
44  
45      /**
46       * Deals with definitions.
47       *
48       * @param   handler Parent handler.
49       */
50      public InitialFunctionDefinitionHandler(final AbstractSimpleHandler handler) {
51          super(handler, "DEFINITION_FUNCTION_INITIAL");
52          elementHandler = new ElementHandler(this);
53          descriptionHandler = new LatexListHandler(this, "DESCRIPTION");
54      }
55  
56      public final void init() {
57          definition = null;
58          latexPattern = null;
59      }
60  
61      /**
62       * Get definition.
63       *
64       * @return  Definition.
65       */
66      public final InitialFunctionDefinitionVo getDefinition() {
67          return definition;
68      }
69  
70      public final void startElement(final String name, final SimpleAttributes attributes)
71              throws XmlSyntaxException {
72          if (getStartTag().equals(name)) {
73              definition = new InitialFunctionDefinitionVo();
74              definition.setArgumentNumber(attributes.getString("arguments"));
75              definition.setName(attributes.getString("name"));
76          } else if ("LATEXPATTERN".equals(name)) {
77              // nothing to do yet
78          } else if ("FUNCON".equals(name)) {
79              changeHandler(elementHandler, name, attributes);
80          } else if (descriptionHandler.getStartTag().equals(name)) {
81              changeHandler(descriptionHandler, name, attributes);
82          } else {
83              throw XmlSyntaxException.createUnexpectedTagException(name);
84          }
85      }
86  
87      public final void endElement(final String name) throws XmlSyntaxException {
88          if (getStartTag().equals(name)) {
89              // nothing to do
90          } else if ("LATEXPATTERN".equals(name)) {
91              definition.setLatexPattern(latexPattern);
92          } else if ("FUNCON".equals(name)) {
93              definition.setFunCon(elementHandler.getElement());
94          } else if (descriptionHandler.getStartTag().equals(name)) {
95              definition.setDescription(descriptionHandler.getLatexList());
96          } else {
97              throw XmlSyntaxException.createUnexpectedTagException(name);
98          }
99      }
100 
101     public final void characters(final String name, final String data) {
102         if ("LATEXPATTERN".equals(name)) {
103             latexPattern = data;
104         } else {
105             throw new RuntimeException("Unexpected character data in tag: " + name);
106         }
107     }
108 
109 
110 }