ContentHandler, DTDHandler, EntityResolver, ErrorHandler
DefaultHandler2public class DefaultHandler extends Object implements EntityResolver, DTDHandler, ContentHandler, ErrorHandler
This class is available as a convenience base class for SAX2 applications: it provides default implementations for all of the callbacks in the four core SAX2 handler classes:
Application writers can extend this class when they need to implement only part of an interface; parser writers can instantiate this class to provide default handlers when the application has not supplied its own.
This class replaces the deprecated SAX1 HandlerBase class.
| Constructor | Description |
|---|---|
DefaultHandler() |
Constructs a DefaultHandler. |
| Modifier and Type | Method | Description |
|---|---|---|
void |
characters |
Receive notification of character data inside an element. |
void |
endDocument() |
Receive notification of the end of the document. |
void |
endElement |
Receive notification of the end of an element. |
void |
endPrefixMapping |
Receive notification of the end of a Namespace mapping. |
void |
error |
Receive notification of a recoverable parser error. |
void |
fatalError |
Report a fatal XML parsing error. |
void |
ignorableWhitespace |
Receive notification of ignorable whitespace in element content. |
void |
notationDecl |
Receive notification of a notation declaration. |
void |
processingInstruction |
Receive notification of a processing instruction. |
InputSource |
resolveEntity |
Resolve an external entity. |
void |
setDocumentLocator |
Receive a Locator object for document events. |
void |
skippedEntity |
Receive notification of a skipped entity. |
void |
startDocument() |
Receive notification of the beginning of the document. |
void |
startElement |
Receive notification of the start of an element. |
void |
startPrefixMapping |
Receive notification of the start of a Namespace mapping. |
void |
unparsedEntityDecl |
Receive notification of an unparsed entity declaration. |
void |
warning |
Receive notification of a parser warning. |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
declaration
public DefaultHandler()
DefaultHandler.public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException
Always return null, so that the parser will use the system identifier provided in the XML document. This method implements the SAX default behaviour: application writers can override it in a subclass to do special translations such as catalog lookups or URI redirection.
resolveEntity in interface EntityResolver
publicId - The public identifier, or null if none is available.systemId - The system identifier provided in the XML document.IOException - If there is an error setting up the new input source.SAXException - Any SAX exception, possibly wrapping another exception.public void notationDecl(String name, String publicId, String systemId) throws SAXException
By default, do nothing. Application writers may override this method in a subclass if they wish to keep track of the notations declared in a document.
notationDecl in interface DTDHandler
name - The notation name.publicId - The notation public identifier, or null if not available.systemId - The notation system identifier.SAXException - Any SAX exception, possibly wrapping another exception.public void unparsedEntityDecl(String name, String publicId, String systemId, String notationName) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to keep track of the unparsed entities declared in a document.
unparsedEntityDecl in interface DTDHandler
name - The entity name.publicId - The entity public identifier, or null if not available.systemId - The entity system identifier.notationName - The name of the associated notation.SAXException - Any SAX exception, possibly wrapping another exception.public void setDocumentLocator(Locator locator)
By default, do nothing. Application writers may override this method in a subclass if they wish to store the locator for use with other document events.
setDocumentLocator in interface ContentHandler
locator - A locator for all SAX document events.public void startDocument() throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the beginning of a document (such as allocating the root node of a tree or creating an output file).
startDocument in interface ContentHandler
SAXException - Any SAX exception, possibly wrapping another exception.public void endDocument() throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of a document (such as finalising a tree or closing an output file).
endDocument in interface ContentHandler
SAXException - Any SAX exception, possibly wrapping another exception.public void startPrefixMapping(String prefix, String uri) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each Namespace prefix scope (such as storing the prefix mapping).
startPrefixMapping in interface ContentHandler
prefix - The Namespace prefix being declared.uri - The Namespace URI mapped to the prefix.SAXException - Any SAX exception, possibly wrapping another exception.public void endPrefixMapping(String prefix) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each prefix mapping.
endPrefixMapping in interface ContentHandler
prefix - The Namespace prefix being declared.SAXException - Any SAX exception, possibly wrapping another exception.public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).
startElement in interface ContentHandler
uri - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.localName - The local name (without prefix), or the empty string if Namespace processing is not being performed.qName - The qualified name (with prefix), or the empty string if qualified names are not available.attributes - The attributes attached to the element. If there are no attributes, it shall be an empty Attributes object.SAXException - Any SAX exception, possibly wrapping another exception.public void endElement(String uri, String localName, String qName) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each element (such as finalising a tree node or writing output to a file).
endElement in interface ContentHandler
uri - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.localName - The local name (without prefix), or the empty string if Namespace processing is not being performed.qName - The qualified name (with prefix), or the empty string if qualified names are not available.SAXException - Any SAX exception, possibly wrapping another exception.public void characters(char[] ch, int start, int length) throws SAXException
By default, do nothing. Application writers may override this method to take specific actions for each chunk of character data (such as adding the data to a node or buffer, or printing it to a file).
characters in interface ContentHandler
ch - The characters.start - The start position in the character array.length - The number of characters to use from the character array.SAXException - Any SAX exception, possibly wrapping another exception.public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException
By default, do nothing. Application writers may override this method to take specific actions for each chunk of ignorable whitespace (such as adding data to a node or buffer, or printing it to a file).
ignorableWhitespace in interface ContentHandler
ch - The whitespace characters.start - The start position in the character array.length - The number of characters to use from the character array.SAXException - Any SAX exception, possibly wrapping another exception.public void processingInstruction(String target, String data) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.
processingInstruction in interface ContentHandler
target - The processing instruction target.data - The processing instruction data, or null if none is supplied.SAXException - Any SAX exception, possibly wrapping another exception.public void skippedEntity(String name) throws SAXException
By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.
skippedEntity in interface ContentHandler
name - The name of the skipped entity.SAXException - Any SAX exception, possibly wrapping another exception.public void warning(SAXParseException e) throws SAXException
The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each warning, such as inserting the message in a log file or printing it to the console.
warning in interface ErrorHandler
e - The warning information encoded as an exception.SAXException - Any SAX exception, possibly wrapping another exception.public void error(SAXParseException e) throws SAXException
The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each error, such as inserting the message in a log file or printing it to the console.
error in interface ErrorHandler
e - The error information encoded as an exception.SAXException - Any SAX exception, possibly wrapping another exception.public void fatalError(SAXParseException e) throws SAXException
The default implementation throws a SAXParseException. Application writers may override this method in a subclass if they need to take specific actions for each fatal error (such as collecting all of the errors into a single report): in any case, the application must stop all regular processing when this method is invoked, since the document is no longer reliable, and the parser may no longer report parsing events.
fatalError in interface ErrorHandler
e - The error information encoded as an exception.SAXException - Any SAX exception, possibly wrapping another exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.xml/org/xml/sax/helpers/DefaultHandler.html