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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.Term;
20 import org.qedeq.kernel.se.dto.module.SubstFreeVo;
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 SubstFreevarHandler extends AbstractSimpleHandler {
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35 private SubstFreeVo substFreevar;
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38 private String ref;
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41 private Element subjectVariable;
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44 private Term substituteTerm;
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47 private final TermHandler termHandler;
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50 private final ElementHandler elementHandler;
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57 public SubstFreevarHandler(final AbstractSimpleHandler handler) {
58 super(handler, "SUBST_FREE");
59 termHandler = new TermHandler(this);
60 elementHandler = new ElementHandler(this);
61 }
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63 public final void init() {
64 substFreevar = null;
65 subjectVariable = null;
66 substituteTerm = null;
67 ref = null;
68 }
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75 public final SubstFreeVo getSubstFreeVo() {
76 return substFreevar;
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 ("VAR".equals(name)) {
84 changeHandler(elementHandler, name, attributes);
85 } else if (termHandler.getStartTag().equals(name)) {
86 changeHandler(termHandler, 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 substFreevar = new SubstFreeVo(ref, subjectVariable,
95 (substituteTerm != null ? substituteTerm.getElement() : null));
96 } else if ("VAR".equals(name)) {
97 subjectVariable = elementHandler.getElement();
98 } else if (termHandler.getStartTag().equals(name)) {
99 substituteTerm = termHandler.getTerm();
100 } else {
101 throw XmlSyntaxException.createUnexpectedTagException(name);
102 }
103 }
104
105 }