org.xml.sax.helpers.DefaultHandler
Default base class for SAX2 event 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 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.
Known Direct Subclasses
Summary
Public Constructors
Public Methods
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void |
characters(char[] ch, int start, int length) |
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void |
endDocument() |
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void |
endElement(String uri, String localName, String qName) |
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void |
endPrefixMapping(String prefix) |
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void |
error(SAXParseException e) |
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void |
fatalError(SAXParseException e) |
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void |
ignorableWhitespace(char[] ch, int start, int length) |
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void |
notationDecl(String name, String publicId, String systemId) |
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void |
processingInstruction(String target, String data) |
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InputSource |
resolveEntity(String publicId, String systemId) |
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void |
setDocumentLocator(Locator locator) |
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void |
skippedEntity(String name) |
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void |
startDocument() |
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void |
startElement(String uri, String localName, String qName, Attributes attributes) |
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void |
startPrefixMapping(String prefix, String uri) |
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void |
unparsedEntityDecl(String name, String publicId, String systemId, String notationName) |
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void |
warning(SAXParseException e) |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait
characters,
endDocument,
endElement,
endPrefixMapping,
ignorableWhitespace,
processingInstruction,
setDocumentLocator,
skippedEntity,
startDocument,
startElement,
startPrefixMapping
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void |
characters(char[] ch, int start, int length) |
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void |
endDocument() |
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void |
endElement(String uri, String localName, String qName) |
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void |
endPrefixMapping(String prefix) |
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void |
ignorableWhitespace(char[] ch, int start, int length) |
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void |
processingInstruction(String target, String data) |
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void |
setDocumentLocator(Locator locator) |
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void |
skippedEntity(String name) |
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void |
startDocument() |
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void |
startElement(String uri, String localName, String qName, Attributes atts) |
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void |
startPrefixMapping(String prefix, String uri) |
Details
Public Constructors
Public Methods
public
void
characters(char[] ch, int start, int length)
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).
Parameters
ch
| The characters. |
start
| The start position in the character array. |
length
| The number of characters to use from the
character array. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
endDocument()
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 end
of a document (such as finalising a tree or closing an output
file).
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
endElement(String uri, String localName, String qName)
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).
Parameters
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. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
endPrefixMapping(String prefix)
Receive notification of the end of a Namespace mapping.
By default, do nothing. Application writers may override this
method in a subclass to take specific actions at the end of
each prefix mapping.
Parameters
prefix
| The Namespace prefix being declared. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
Receive notification of a recoverable parser error.
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.
Parameters
e
| The warning information encoded as an exception. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
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.
Parameters
e
| The error information encoded as an exception. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
ignorableWhitespace(char[] ch, int start, int length)
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).
Parameters
ch
| The whitespace characters. |
start
| The start position in the character array. |
length
| The number of characters to use from the
character array. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
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.
Parameters
name
| The notation name. |
publicId
| The notation public identifier, or null if not
available. |
systemId
| The notation system identifier. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
processingInstruction(String target, String data)
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.
Parameters
target
| The processing instruction target. |
data
| The processing instruction data, or null if
none is supplied. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
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.
Parameters
publicId
| The public identifer, or null if none is
available. |
systemId
| The system identifier provided in the XML
document. |
Returns
- The new input source, or null to require the
default behaviour.
Throws
IOException
| If there is an error setting
up the new input source. |
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
setDocumentLocator(Locator locator)
Receive a Locator object for document events.
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.
Parameters
locator
| A locator for all SAX document events. |
public
void
skippedEntity(String name)
Receive notification of a skipped entity.
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.
Parameters
name
| The name of the skipped entity. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
startDocument()
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).
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
startElement(String uri, String localName, String qName, Attributes attributes)
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).
Parameters
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. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
public
void
startPrefixMapping(String prefix, String uri)
Receive notification of the start of a Namespace mapping.
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).
Parameters
prefix
| The Namespace prefix being declared. |
uri
| The Namespace URI mapped to the prefix. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
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.
Parameters
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. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |
Receive notification of a parser warning.
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.
Parameters
e
| The warning information encoded as an exception. |
Throws
SAXException
| Any SAX exception, possibly
wrapping another exception. |