Top Description Methods
org.xml.sax.ext

public Interface LexicalHandler

Known Direct Subinterfaces
com.sun.org.apache.xalan.internal.xsltc.dom.ExtendedSAX, com.sun.org.apache.xml.internal.serializer.ExtendedLexicalHandler, javax.xml.transform.sax.TransformerHandler
Known Direct Implementers
com.sun.org.apache.xml.internal.utils.DOMBuilder, com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM, com.sun.org.apache.xalan.internal.xsltc.trax.SAX2StAXBaseWriter, com.sun.org.apache.xml.internal.dtm.ref.DTMDocumentImpl, com.sun.org.apache.xml.internal.dtm.ref.IncrementalSAXSource_Filter, com.sun.org.apache.xml.internal.dtm.ref.sax2dtm.SAX2DTM, com.sun.org.apache.xml.internal.serialize.BaseMarkupSerializer, org.xml.sax.ext.DefaultHandler2
Imports
org.xml.sax.SAXException

SAX2 extension handler for lexical events.

This is an optional extension handler for SAX2 to provide lexical information about an XML document, such as comments and CDATA section boundaries. XML readers are not required to recognize this handler, and it is not part of core-only SAX2 distributions.

The events in the lexical handler apply to the entire document, not just to the document element, and all lexical handler events must appear between the content handler's startDocument and endDocument events.

To set the LexicalHandler for an XML reader, use the setProperty method with the property name http://xml.org/sax/properties/lexical-handler and an object implementing this interface (or null) as the value. If the reader does not report lexical events, it will throw a SAXNotRecognizedException when you attempt to register the handler.

Author
David Megginson
Since
1.4, SAX 2.0 (extensions 1.0)

Method Summary

Modifier and TypeMethod and Description
public void
comment(char[]
An array holding the characters in the comment.
ch
,
int
The starting position in the array.
start
,
int
The number of characters to use from the array.
length
)

Report an XML comment anywhere in the document.

public void
endCDATA()

Report the end of a CDATA section.

public void
endDTD()

Report the end of DTD declarations.

public void
endEntity(String
The name of the entity that is ending.
name
)

Report the end of an entity.

public void
startCDATA()

Report the start of a CDATA section.

public void
startDTD(String
The document type name.
name
,
String
The declared public identifier for the external DTD subset, or null if none was declared.
publicId
,
String
The declared system identifier for the external DTD subset, or null if none was declared. (Note that this is not resolved against the document base URI.)
systemId
)

Report the start of DTD declarations, if any.

public void
startEntity(String
The name of the entity. If it is a parameter entity, the name will begin with '%', and if it is the external DTD subset, it will be "[dtd]".
name
)

Report the beginning of some internal and external XML entities.

Method Detail

commentback to summary
public void comment(char[] ch, int start, int length) throws SAXException

Report an XML comment anywhere in the document.

This callback will be used for comments inside or outside the document element, including comments in the external DTD subset (if read). Comments in the DTD must be properly nested inside start/endDTD and start/endEntity events (if used).

Parameters
ch:char[]

An array holding the characters in the comment.

start:int

The starting position in the array.

length:int

The number of characters to use from the array.

Exceptions
SAXException:
The application may raise an exception.
endCDATAback to summary
public void endCDATA() throws SAXException

Report the end of a CDATA section.

Exceptions
SAXException:
The application may raise an exception.
See Also
startCDATA
endDTDback to summary
public void endDTD() throws SAXException

Report the end of DTD declarations.

This method is intended to report the end of the DOCTYPE declaration; if the document has no DOCTYPE declaration, this method will not be invoked.

Exceptions
SAXException:
The application may raise an exception.
See Also
startDTD
endEntityback to summary
public void endEntity(String name) throws SAXException

Report the end of an entity.

Parameters
name:String

The name of the entity that is ending.

Exceptions
SAXException:
The application may raise an exception.
See Also
startEntity
startCDATAback to summary
public void startCDATA() throws SAXException

Report the start of a CDATA section.

The contents of the CDATA section will be reported through the regular characters event; this event is intended only to report the boundary.

Exceptions
SAXException:
The application may raise an exception.
See Also
endCDATA
startDTDback to summary
public void startDTD(String name, String publicId, String systemId) throws SAXException

Report the start of DTD declarations, if any.

This method is intended to report the beginning of the DOCTYPE declaration; if the document has no DOCTYPE declaration, this method will not be invoked.

All declarations reported through DTDHandler or DeclHandler events must appear between the startDTD and endDTD events. Declarations are assumed to belong to the internal DTD subset unless they appear between startEntity and endEntity events. Comments and processing instructions from the DTD should also be reported between the startDTD and endDTD events, in their original order of (logical) occurrence; they are not required to appear in their correct locations relative to DTDHandler or DeclHandler events, however.

Note that the start/endDTD events will appear within the start/endDocument events from ContentHandler and before the first startElement event.

Parameters
name:String

The document type name.

publicId:String

The declared public identifier for the external DTD subset, or null if none was declared.

systemId:String

The declared system identifier for the external DTD subset, or null if none was declared. (Note that this is not resolved against the document base URI.)

Exceptions
SAXException:
The application may raise an exception.
See Also
endDTD, startEntity
startEntityback to summary
public void startEntity(String name) throws SAXException

Report the beginning of some internal and external XML entities.

The reporting of parameter entities (including the external DTD subset) is optional, and SAX2 drivers that report LexicalHandler events may not implement it; you can use the http://xml.org/sax/features/lexical-handler/parameter-entities feature to query or control the reporting of parameter entities.

General entities are reported with their regular names, parameter entities have '%' prepended to their names, and the external DTD subset has the pseudo-entity name "[dtd]".

When a SAX2 driver is providing these events, all other events must be properly nested within start/end entity events. There is no additional requirement that events from DeclHandler or DTDHandler be properly ordered.

Note that skipped entities will be reported through the skippedEntity event, which is part of the ContentHandler interface.

Because of the streaming event model that SAX uses, some entity boundaries cannot be reported under any circumstances:

  • general entities within attribute values
  • parameter entities within declarations

These will be silently expanded, with no indication of where the original entity boundaries were.

Note also that the boundaries of character references (which are not really entities anyway) are not reported.

All start/endEntity events must be properly nested.

Parameters
name:String

The name of the entity. If it is a parameter entity, the name will begin with '%', and if it is the external DTD subset, it will be "[dtd]".

Exceptions
SAXException:
The application may raise an exception.
See Also
endEntity, org.xml.sax.ext.DeclHandler#internalEntityDecl, org.xml.sax.ext.DeclHandler#externalEntityDecl