org.xml.sax

Class HandlerBase

public class HandlerBase extends Object implements EntityResolver, DTDHandler, DocumentHandler, ErrorHandler

Deprecated: This class works with the deprecated DocumentHandler interface. It has been replaced by the SAX2 DefaultHandler class.

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.

Since: SAX 1.0

Version: 2.0.1 (sax2r2)

Author: David Megginson

See Also: EntityResolver DTDHandler DocumentHandler ErrorHandler

Method Summary
voidcharacters(char[] ch, int start, int length)
Receive notification of character data inside an element.
voidendDocument()
Receive notification of the end of the document.
voidendElement(String name)
Receive notification of the end of an element.
voiderror(SAXParseException e)
Receive notification of a recoverable parser error.
voidfatalError(SAXParseException e)
Report a fatal XML parsing error.
voidignorableWhitespace(char[] ch, int start, int length)
Receive notification of ignorable whitespace in element content.
voidnotationDecl(String name, String publicId, String systemId)
Receive notification of a notation declaration.
voidprocessingInstruction(String target, String data)
Receive notification of a processing instruction.
InputSourceresolveEntity(String publicId, String systemId)
Resolve an external entity.
voidsetDocumentLocator(Locator locator)
Receive a Locator object for document events.
voidstartDocument()
Receive notification of the beginning of the document.
voidstartElement(String name, AttributeList attributes)
Receive notification of the start of an element.
voidunparsedEntityDecl(String name, String publicId, String systemId, String notationName)
Receive notification of an unparsed entity declaration.
voidwarning(SAXParseException e)
Receive notification of a parser warning.

Method Detail

characters

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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

endDocument

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 beginning of a document (such as finalising a tree or closing an output file).

Throws: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

endElement

public void endElement(String name)
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: name The element type name. attributes The specified or defaulted attributes.

Throws: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

error

public void error(SAXParseException e)
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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: ErrorHandler SAXParseException

fatalError

public void fatalError(SAXParseException e)
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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: ErrorHandler SAXParseException

ignorableWhitespace

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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

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.

Parameters: name The notation name. publicId The notation public identifier, or null if not available. systemId The notation system identifier.

See Also: DTDHandler

processingInstruction

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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

resolveEntity

public InputSource resolveEntity(String publicId, String systemId)
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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: EntityResolver

setDocumentLocator

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.

See Also: DocumentHandler Locator

startDocument

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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

startElement

public void startElement(String name, AttributeList 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: name The element type name. attributes The specified or defaulted attributes.

Throws: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: DocumentHandler

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.

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.

See Also: DTDHandler

warning

public void warning(SAXParseException e)
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: org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.

See Also: ErrorHandler SAXParseException