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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.xml.QXmlDefaultHandler
public class QXmlDefaultHandler
The QXmlDefaultHandler class provides a default implementation of all the XML handler classes.
This class gathers together the features of the specialized handler classes, making it a convenient starting point when implementing custom handlers for subclasses of QXmlReader, particularly QXmlSimpleReader. The virtual functions from each of the base classes are reimplemented in this class, providing sensible default behavior for many common cases. By subclassing this class, and overriding these functions, you can concentrate on implementing the parts of the handler relevant to your application.
The XML reader must be told which handler to use for different kinds of events during parsing. This means that, although QXmlDefaultHandler provides default implementations of functions inherited from all its base classes, we can still use specialized handlers for particular kinds of events.
For example, QXmlDefaultHandler subclasses both QXmlContentHandler and QXmlErrorHandler, so by subclassing it we can use the same handler for both of the following reader functions:
xmlReader.setContentHandler(handler); xmlReader.setErrorHandler(handler);
Since the reader will inform the handler of parsing errors, it is necessary to reimplement QXmlErrorHandler::fatalError() if, for example, we want to stop parsing when such an error occurs:
bool Handler::fatalError (const QXmlParseException & exception) { qWarning() << "Fatal error on line" << exception.lineNumber() << ", column" << exception.columnNumber() << ":" << exception.message(); return false; }
The above function returns false, which tells the reader to stop parsing. To continue to use the same reader, it is necessary to create a new handler instance, and set up the reader to use it in the manner described above.
It is useful to examine some of the functions inherited by QXmlDefaultHandler, and consider why they might be reimplemented in a custom handler. Custom handlers will typically reimplement QXmlContentHandler::startDocument() to prepare the handler for new content. Document elements and the text within them can be processed by reimplementing QXmlContentHandler::startElement(), QXmlContentHandler::endElement(), and QXmlContentHandler::characters(). You may want to reimplement QXmlContentHandler::endDocument() to perform some finalization or validation on the content once the document has been read completely.
to SAX2
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QXmlDefaultHandler()
Constructs a handler for use with subclasses of QXmlReader. |
Method Summary | |
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boolean |
attributeDecl(java.lang.String eName,
java.lang.String aName,
java.lang.String type,
java.lang.String valueDefault,
java.lang.String value)
This function is reimplemented for internal reasons. |
boolean |
characters(java.lang.String ch)
This function is reimplemented for internal reasons. |
boolean |
comment(java.lang.String ch)
This function is reimplemented for internal reasons. |
boolean |
endCDATA()
This function is reimplemented for internal reasons. |
boolean |
endDocument()
This function is reimplemented for internal reasons. |
boolean |
endDTD()
This function is reimplemented for internal reasons. |
boolean |
endElement(java.lang.String namespaceURI,
java.lang.String localName,
java.lang.String qName)
This function is reimplemented for internal reasons. |
boolean |
endEntity(java.lang.String name)
This function is reimplemented for internal reasons. |
boolean |
endPrefixMapping(java.lang.String prefix)
This function is reimplemented for internal reasons. |
boolean |
error(QXmlParseException exception)
This function is reimplemented for internal reasons. |
java.lang.String |
errorString()
This function is reimplemented for internal reasons. |
boolean |
externalEntityDecl(java.lang.String name,
java.lang.String publicId,
java.lang.String systemId)
This function is reimplemented for internal reasons. |
boolean |
fatalError(QXmlParseException exception)
This function is reimplemented for internal reasons. |
static QXmlDefaultHandler |
fromNativePointer(QNativePointer nativePointer)
This function returns the QXmlDefaultHandler instance pointed to by nativePointer |
boolean |
ignorableWhitespace(java.lang.String ch)
This function is reimplemented for internal reasons. |
boolean |
internalEntityDecl(java.lang.String name,
java.lang.String value)
This function is reimplemented for internal reasons. |
boolean |
notationDecl(java.lang.String name,
java.lang.String publicId,
java.lang.String systemId)
This function is reimplemented for internal reasons. |
boolean |
processingInstruction(java.lang.String target,
java.lang.String data)
This function is reimplemented for internal reasons. |
boolean |
resolveEntity(java.lang.String publicId,
java.lang.String systemId,
QXmlInputSource ret)
This function is reimplemented for internal reasons. |
void |
setDocumentLocator(QXmlLocator locator)
This function is reimplemented for internal reasons. |
boolean |
skippedEntity(java.lang.String name)
This function is reimplemented for internal reasons. |
boolean |
startCDATA()
This function is reimplemented for internal reasons. |
boolean |
startDocument()
This function is reimplemented for internal reasons. |
boolean |
startDTD(java.lang.String name,
java.lang.String publicId,
java.lang.String systemId)
This function is reimplemented for internal reasons. |
boolean |
startElement(java.lang.String namespaceURI,
java.lang.String localName,
java.lang.String qName,
QXmlAttributes atts)
This function is reimplemented for internal reasons. |
boolean |
startEntity(java.lang.String name)
This function is reimplemented for internal reasons. |
boolean |
startPrefixMapping(java.lang.String prefix,
java.lang.String uri)
This function is reimplemented for internal reasons. |
boolean |
unparsedEntityDecl(java.lang.String name,
java.lang.String publicId,
java.lang.String systemId,
java.lang.String notationName)
This function is reimplemented for internal reasons. |
boolean |
warning(QXmlParseException exception)
This function is reimplemented for internal reasons. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QXmlDefaultHandler()
Constructs a handler for use with subclasses of QXmlReader.
Method Detail |
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public boolean attributeDecl(java.lang.String eName, java.lang.String aName, java.lang.String type, java.lang.String valueDefault, java.lang.String value)
This function is reimplemented for internal reasons.
attributeDecl
in interface QXmlDeclHandlerInterface
public boolean characters(java.lang.String ch)
This function is reimplemented for internal reasons.
characters
in interface QXmlContentHandlerInterface
public boolean comment(java.lang.String ch)
This function is reimplemented for internal reasons.
comment
in interface QXmlLexicalHandlerInterface
public boolean endCDATA()
This function is reimplemented for internal reasons.
endCDATA
in interface QXmlLexicalHandlerInterface
public boolean endDTD()
This function is reimplemented for internal reasons.
endDTD
in interface QXmlLexicalHandlerInterface
public boolean endDocument()
This function is reimplemented for internal reasons.
endDocument
in interface QXmlContentHandlerInterface
public boolean endElement(java.lang.String namespaceURI, java.lang.String localName, java.lang.String qName)
This function is reimplemented for internal reasons.
endElement
in interface QXmlContentHandlerInterface
Support via Features
public boolean endEntity(java.lang.String name)
This function is reimplemented for internal reasons.
endEntity
in interface QXmlLexicalHandlerInterface
public boolean endPrefixMapping(java.lang.String prefix)
This function is reimplemented for internal reasons.
endPrefixMapping
in interface QXmlContentHandlerInterface
Support via Features
public boolean error(QXmlParseException exception)
This function is reimplemented for internal reasons.
error
in interface QXmlErrorHandlerInterface
public java.lang.String errorString()
This function is reimplemented for internal reasons.
errorString
in interface QXmlContentHandlerInterface
errorString
in interface QXmlDeclHandlerInterface
errorString
in interface QXmlDTDHandlerInterface
errorString
in interface QXmlEntityResolverInterface
errorString
in interface QXmlErrorHandlerInterface
errorString
in interface QXmlLexicalHandlerInterface
public boolean externalEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId)
This function is reimplemented for internal reasons.
externalEntityDecl
in interface QXmlDeclHandlerInterface
public boolean fatalError(QXmlParseException exception)
This function is reimplemented for internal reasons.
fatalError
in interface QXmlErrorHandlerInterface
public boolean ignorableWhitespace(java.lang.String ch)
This function is reimplemented for internal reasons.
ignorableWhitespace
in interface QXmlContentHandlerInterface
public boolean internalEntityDecl(java.lang.String name, java.lang.String value)
This function is reimplemented for internal reasons.
internalEntityDecl
in interface QXmlDeclHandlerInterface
public boolean notationDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId)
This function is reimplemented for internal reasons.
notationDecl
in interface QXmlDTDHandlerInterface
public boolean processingInstruction(java.lang.String target, java.lang.String data)
This function is reimplemented for internal reasons.
processingInstruction
in interface QXmlContentHandlerInterface
public boolean resolveEntity(java.lang.String publicId, java.lang.String systemId, QXmlInputSource ret)
This function is reimplemented for internal reasons.
resolveEntity
in interface QXmlEntityResolverInterface
public void setDocumentLocator(QXmlLocator locator)
This function is reimplemented for internal reasons.
setDocumentLocator
in interface QXmlContentHandlerInterface
public boolean skippedEntity(java.lang.String name)
This function is reimplemented for internal reasons.
skippedEntity
in interface QXmlContentHandlerInterface
public boolean startCDATA()
This function is reimplemented for internal reasons.
startCDATA
in interface QXmlLexicalHandlerInterface
public boolean startDTD(java.lang.String name, java.lang.String publicId, java.lang.String systemId)
This function is reimplemented for internal reasons.
startDTD
in interface QXmlLexicalHandlerInterface
public boolean startDocument()
This function is reimplemented for internal reasons.
startDocument
in interface QXmlContentHandlerInterface
public boolean startElement(java.lang.String namespaceURI, java.lang.String localName, java.lang.String qName, QXmlAttributes atts)
This function is reimplemented for internal reasons.
startElement
in interface QXmlContentHandlerInterface
Support via Features
public boolean startEntity(java.lang.String name)
This function is reimplemented for internal reasons.
startEntity
in interface QXmlLexicalHandlerInterface
public boolean startPrefixMapping(java.lang.String prefix, java.lang.String uri)
This function is reimplemented for internal reasons.
startPrefixMapping
in interface QXmlContentHandlerInterface
Support via Features
public boolean unparsedEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId, java.lang.String notationName)
This function is reimplemented for internal reasons.
unparsedEntityDecl
in interface QXmlDTDHandlerInterface
public boolean warning(QXmlParseException exception)
This function is reimplemented for internal reasons.
warning
in interface QXmlErrorHandlerInterface
public static QXmlDefaultHandler fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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