org.xml.sax
Class HandlerBase
- DocumentHandler, DTDHandler, EntityResolver, ErrorHandler
public class HandlerBase
extends java.lang.Object
Default base class for handlers.
This module, both source code and documentation, is in the
Public Domain, and comes with NO WARRANTY.
See http://www.saxproject.org
for further information.
This class implements the default behaviour for four SAX1
interfaces: EntityResolver, DTDHandler, DocumentHandler,
and ErrorHandler. It is now obsolete, but is included in SAX2 to
support legacy SAX1 applications. SAX2 applications should use
the
DefaultHandler
class instead.
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.
Note that the use of this class is optional.
DocumentHandler
interface. It has been replaced by the SAX2
DefaultHandler
class.
- SAX 1.0
EntityResolver, DTDHandler, DocumentHandler, ErrorHandler
void | characters(ch[] , int start, int length)- Receive notification of character data inside an element.
|
void | endDocument()- Receive notification of the end of the document.
|
void | endElement(String name)- Receive notification of the end of an element.
|
void | error(SAXParseException e)- Receive notification of a recoverable parser error.
|
void | fatalError(SAXParseException e)- Report a fatal XML parsing error.
|
void | ignorableWhitespace(ch[] , int start, int length)- Receive notification of ignorable whitespace in element content.
|
void | notationDecl(String name, String publicId, String systemId)- Receive notification of a notation declaration.
|
void | processingInstruction(String target, String data)- Receive notification of a processing instruction.
|
InputSource | resolveEntity(String publicId, String systemId)- Resolve an external entity.
|
void | setDocumentLocator(Locator locator)- Receive a Locator object for document events.
|
void | startDocument()- Receive notification of the beginning of the document.
|
void | startElement(String name, AttributeList attributes)- Receive notification of the start of an element.
|
void | unparsedEntityDecl(String name, String publicId, String systemId, String notationName)- Receive notification of an unparsed entity declaration.
|
void | warning(SAXParseException e)- Receive notification of a parser warning.
|
characters
public void characters(ch[] ,
int start,
int length)
throws SAXException Receive notification of character data inside an element.
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 DocumentHandler
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.
DocumentHandler.characters(ch[],int,int)
endDocument
public void endDocument()
throws SAXException Receive notification of the end of the document.
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 finalising a tree or closing an output
file).
- endDocument in interface DocumentHandler
SAXException - Any SAX exception, possibly
wrapping another exception.
DocumentHandler.endDocument()
endElement
public void endElement(String name)
throws SAXException Receive notification of the end of an element.
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 DocumentHandler
name - the element name
SAXException - Any SAX exception, possibly
wrapping another exception.
DocumentHandler.endElement(String)
fatalError
public void fatalError(SAXParseException e)
throws SAXException Report a fatal XML parsing error.
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.
ErrorHandler.fatalError(SAXParseException), SAXParseException
ignorableWhitespace
public void ignorableWhitespace(ch[] ,
int start,
int length)
throws SAXException Receive notification of ignorable whitespace in element content.
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 DocumentHandler
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.
DocumentHandler.ignorableWhitespace(ch[],int,int)
notationDecl
public void notationDecl(String name,
String publicId,
String systemId) Receive notification of a notation declaration.
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.
DTDHandler.notationDecl(String,String,String)
processingInstruction
public void processingInstruction(String target,
String data)
throws SAXException Receive notification of a processing instruction.
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 DocumentHandler
target - The processing instruction target.data - The processing instruction data, or null if
none is supplied.
SAXException - Any SAX exception, possibly
wrapping another exception.
DocumentHandler.processingInstruction(String,String)
resolveEntity
public InputSource resolveEntity(String publicId,
String systemId)
throws SAXException Resolve an external entity.
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 identifer, or null if none is
available.systemId - The system identifier provided in the XML
document.
- The new input source, or null to require the
default behaviour.
SAXException - Any SAX exception, possibly
wrapping another exception.
EntityResolver.resolveEntity(String,String)
startDocument
public void startDocument()
throws SAXException Receive notification of the beginning of the document.
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 DocumentHandler
SAXException - Any SAX exception, possibly
wrapping another exception.
DocumentHandler.startDocument()
startElement
public void startElement(String name,
AttributeList attributes)
throws SAXException Receive notification of the start of an element.
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 DocumentHandler
name - The element type name.attributes - The specified or defaulted attributes.
SAXException - Any SAX exception, possibly
wrapping another exception.
DocumentHandler.startElement(String,AttributeList)
unparsedEntityDecl
public void unparsedEntityDecl(String name,
String publicId,
String systemId,
String notationName) Receive notification of an unparsed entity declaration.
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.
DTDHandler.unparsedEntityDecl(String,String,String,String)