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org.xml.sax.ext
interface LexicalHandler

All Known Implementing Classes:
DefaultHandler2

public interface LexicalHandler

SAX2 extension handler for lexical events.

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 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 {@link org.xml.sax.XMLReader#setProperty 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 {@link org.xml.sax.SAXNotRecognizedException SAXNotRecognizedException} when you attempt to register the handler.


Method Summary
 void
comment(char[] ch, int start, int length)

          Report an XML comment anywhere in the document.
 void

          Report the end of a CDATA section.
 void

          Report the end of DTD declarations.
 void

          Report the end of an entity.
 void

          Report the start of a CDATA section.
 void
startDTD(String name, String publicId, String systemId)

          Report the start of DTD declarations, if any.
 void

          Report the beginning of some internal and external XML entities.
 

Method Detail

comment

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 - An array holding the characters in the comment.
start - The starting position in the array.
length - The number of characters to use from the array.
Throws:
SAXException - The application may raise an exception.

endCDATA

public void endCDATA()
              throws SAXException
Report the end of a CDATA section.

Throws:
SAXException - The application may raise an exception.

endDTD

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.

Throws:
SAXException - The application may raise an exception.

endEntity

public void endEntity(String name)
               throws SAXException
Report the end of an entity.

Parameters:
name - The name of the entity that is ending.
Throws:
SAXException - The application may raise an exception.

startCDATA

public void startCDATA()
                throws SAXException
Report the start of a CDATA section.

The contents of the CDATA section will be reported through the regular {@link org.xml.sax.ContentHandler#characters characters} event; this event is intended only to report the boundary.

Throws:
SAXException - The application may raise an exception.

startDTD

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 {@link org.xml.sax.DTDHandler DTDHandler} or {@link org.xml.sax.ext.DeclHandler DeclHandler} events must appear between the startDTD and {@link #endDTD endDTD} events. Declarations are assumed to belong to the internal DTD subset unless they appear between {@link #startEntity startEntity} and {@link #endEntity 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 {@link org.xml.sax.ContentHandler#startElement startElement} event.

Parameters:
name - The document type name.
publicId - The declared public identifier for the external DTD subset, or null if none was declared.
systemId - 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.)
Throws:
SAXException - The application may raise an exception.

startEntity

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 {@link org.xml.sax.ext.DeclHandler DeclHandler} or {@link org.xml.sax.DTDHandler DTDHandler} be properly ordered.

Note that skipped entities will be reported through the {@link org.xml.sax.ContentHandler#skippedEntity 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:

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 - 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]".
Throws:
SAXException - The application may raise an exception.


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
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Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.