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16 package org.qedeq.kernel.xml.handler.module;
17
18 import org.qedeq.kernel.se.base.list.Element;
19 import org.qedeq.kernel.se.base.module.Formula;
20 import org.qedeq.kernel.se.dto.module.SubstPredVo;
21 import org.qedeq.kernel.xml.common.XmlSyntaxException;
22 import org.qedeq.kernel.xml.handler.common.AbstractSimpleHandler;
23 import org.qedeq.kernel.xml.handler.common.SimpleAttributes;
24 import org.qedeq.kernel.xml.handler.list.ElementHandler;
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32 public class SubstPredvarHandler extends AbstractSimpleHandler {
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35 private SubstPredVo substPredvar;
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38 private String ref;
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41 private Element predicateVariable;
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44 private Formula substituteFormula;
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47 private final FormulaHandler formulaHandler;
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50 private final ElementHandler elementHandler;
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57 public SubstPredvarHandler(final AbstractSimpleHandler handler) {
58 super(handler, "SUBST_PREDVAR");
59 formulaHandler = new FormulaHandler(this);
60 elementHandler = new ElementHandler(this);
61 }
62
63 public final void init() {
64 substPredvar = null;
65 predicateVariable = null;
66 substituteFormula = null;
67 ref = null;
68 }
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75 public final SubstPredVo getSubstPredVo() {
76 return substPredvar;
77 }
78
79 public final void startElement(final String name, final SimpleAttributes attributes)
80 throws XmlSyntaxException {
81 if (getStartTag().equals(name)) {
82 ref = attributes.getString("ref");
83 } else if ("PREDVAR".equals(name)) {
84 changeHandler(elementHandler, name, attributes);
85 } else if (formulaHandler.getStartTag().equals(name)) {
86 changeHandler(formulaHandler, name, attributes);
87 } else {
88 throw XmlSyntaxException.createUnexpectedTagException(name);
89 }
90 }
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92 public final void endElement(final String name) throws XmlSyntaxException {
93 if (getStartTag().equals(name)) {
94 substPredvar = new SubstPredVo(ref, predicateVariable,
95 (substituteFormula != null ? substituteFormula.getElement() : null));
96 } else if ("PREDVAR".equals(name)) {
97 predicateVariable = elementHandler.getElement();
98 } else if (formulaHandler.getStartTag().equals(name)) {
99 substituteFormula = formulaHandler.getFormula();
100 } else {
101 throw XmlSyntaxException.createUnexpectedTagException(name);
102 }
103 }
104
105 }