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Interface LexicalHandler

All Known Subinterfaces:

TransformerHandler

public interfaceLexicalHandler

SAX2 extension handler for lexical events.

This module, both source code and documentation, is in the Public Domain, and comes withNO WARRANTY.

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 support this handler, and it is not part of the core SAX2 distribution.

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 thesetProperty method with the propertyId "http://xml.org/sax/properties/lexical-handler". If the reader does not support lexical events, it will throw aSAXNotRecognizedException or aSAXNotSupportedException when you attempt to register the handler.

Since:

1.0

See Also:

XMLReader.setProperty(java.lang.String, java.lang.Object),SAXNotRecognizedException,SAXNotSupportedException

startDTD

public voidstartDTD(java.lang.String name,                     java.lang.String publicId,                     java.lang.String systemId)              throwsSAXException

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 throughDTDHandler orDeclHandler events must appear between the startDTD andendDTD events. Declarations are assumed to belong to the internal DTD subset unless they appear betweenstartEntity andendEntity 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 firststartElement 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.

Throws:

SAXException - The application may raise an exception.

See Also:

endDTD(),startEntity(java.lang.String)

endDTD

public voidendDTD()            throwsSAXException

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.

See Also:

startDTD(java.lang.String, java.lang.String, java.lang.String)

startEntity

public voidstartEntity(java.lang.String name)                 throwsSAXException

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 support LexicalHandler may not support it; you can use thehttp://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 fromDeclHandler orDTDHandler be properly ordered.

Note that skipped entities will be reported through theskippedEntity 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 - 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.

See Also:

endEntity(java.lang.String),DeclHandler.internalEntityDecl(java.lang.String, java.lang.String),DeclHandler.externalEntityDecl(java.lang.String, java.lang.String, java.lang.String)

endEntity

public voidendEntity(java.lang.String name)               throwsSAXException

Report the end of an entity.

Parameters:

name - The name of the entity that is ending.

Throws:

SAXException - The application may raise an exception.

See Also:

startEntity(java.lang.String)

startCDATA

public voidstartCDATA()                throwsSAXException

Report the start of a CDATA section.

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

Throws:

SAXException - The application may raise an exception.

See Also:

endCDATA()

endCDATA

public voidendCDATA()              throwsSAXException

Report the end of a CDATA section.

Throws:

SAXException - The application may raise an exception.

See Also:

startCDATA()

comment

public voidcomment(char[] ch,                    int start,                    int length)             throwsSAXException

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.