net.sf.saxon.event
Class ContentHandlerProxy

java.lang.Object
  net.sf.saxon.event.Emitter
      net.sf.saxon.event.ContentHandlerProxy

All Implemented Interfaces:

org.xml.sax.Locator, Receiver, javax.xml.transform.Result

Direct Known Subclasses:

TypedContentHandler

public class ContentHandlerProxy

extends Emitter

implements org.xml.sax.Locator

A ContentHandlerProxy is an Emitter that filters data before passing it to an underlying SAX2 ContentHandler. Relevant events (notably comments) can also be fed to a LexicalHandler.

Note that in general the output passed to an Emitter corresponds to an External General Parsed Entity. A SAX2 ContentHandler only expects to deal with well-formed XML documents, so we only pass it the contents of the first element encountered, unless the saxon:require-well-formed output property is set to "no".

This ContentHandlerProxy provides no access to type information. For a ContentHandler that makes type information available, see TypedContentHandler

Field Summary

protected org.xml.sax.ContentHandler	handler
protected org.xml.sax.ext.LexicalHandler	lexicalHandler
protected AttributeCollectionImpl	pendingAttributes

Fields inherited from class net.sf.saxon.event.Emitter

characterSet, namePool, outputProperties, outputStream, pipelineConfig, streamResult, systemId, writer

Fields inherited from interface javax.xml.transform.Result

PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING

Constructor Summary

ContentHandlerProxy()

Method Summary

void	attribute(int nameCode, int typeCode, java.lang.CharSequence value, int locationId, int properties) Notify an attribute.
void	characters(java.lang.CharSequence chars, int locationId, int properties) Character data
void	close() End of document
void	comment(java.lang.CharSequence chars, int locationId, int properties) Output a comment.
void	endDocument() Notify the end of a document node
void	endElement() End of element
int	getColumnNumber() Get the column number
int	getLineNumber() Get the line number
java.lang.String	getPublicId() Get the Public ID
java.lang.String	getSystemId() Get the System ID
org.xml.sax.ContentHandler	getUnderlyingContentHandler() Get the underlying content handler
boolean	isRequireWellFormed() Determine whether the content handler can handle a stream of events that is merely well-balanced, or whether it can only handle a well-formed sequence.
boolean	isUndeclareNamespaces() Determine whether namespace undeclaration events (for a non-null prefix) should be notified.
void	namespace(int namespaceCode, int properties) Notify a namespace.
protected void	notifyNotWellFormed() The following function is called when it is found that the output is not a well-formed document.
void	open() Start of document
void	processingInstruction(java.lang.String target, java.lang.CharSequence data, int locationId, int properties) Processing Instruction
void	setLexicalHandler(org.xml.sax.ext.LexicalHandler handler) Set the Lexical Handler to be used.
void	setOutputProperties(java.util.Properties details) Set the output details.
void	setPipelineConfiguration(PipelineConfiguration config) Set the pipeline configuration
void	setRequireWellFormed(boolean wellFormed) Indicate whether the content handler can handle a stream of events that is merely well-balanced, or whether it can only handle a well-formed sequence.
void	setUndeclareNamespaces(boolean undeclareNamespaces) Determine whether namespace undeclaration events (for a non-null prefix) should be notified.
void	setUnderlyingContentHandler(org.xml.sax.ContentHandler handler) Set the underlying content handler.
void	startContent() Notify the start of the content, that is, the completion of all attributes and namespaces.
void	startDocument(int properties) Start of a document node.
void	startElement(int nameCode, int typeCode, int locationId, int properties) Notify the start of an element

Methods inherited from class net.sf.saxon.event.Emitter

getConfiguration, getOutputProperties, getOutputStream, getPipelineConfiguration, getWriter, makeEmitter, makeWriter, setOutputStream, setStreamResult, setSystemId, setUnparsedEntity, setWriter, usesWriter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

handler

protected org.xml.sax.ContentHandler handler

lexicalHandler

protected org.xml.sax.ext.LexicalHandler lexicalHandler

pendingAttributes

protected AttributeCollectionImpl pendingAttributes

Constructor Detail

ContentHandlerProxy

public ContentHandlerProxy()

Method Detail

setUnderlyingContentHandler

public void setUnderlyingContentHandler(org.xml.sax.ContentHandler handler)

Set the underlying content handler. This call is mandatory before using the Emitter.

getUnderlyingContentHandler

public org.xml.sax.ContentHandler getUnderlyingContentHandler()

Get the underlying content handler

setLexicalHandler

public void setLexicalHandler(org.xml.sax.ext.LexicalHandler handler)

Set the Lexical Handler to be used. If called, this must be called AFTER setUnderlyingContentHandler()

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration config)

Set the pipeline configuration

Specified by:

setPipelineConfiguration in interface Receiver

Overrides:

setPipelineConfiguration in class Emitter

setOutputProperties

public void setOutputProperties(java.util.Properties details)
                         throws XPathException

Set the output details.

Overrides:

setOutputProperties in class Emitter

Throws:

XPathException

isRequireWellFormed

public boolean isRequireWellFormed()

Determine whether the content handler can handle a stream of events that is merely well-balanced, or whether it can only handle a well-formed sequence.

setRequireWellFormed

public void setRequireWellFormed(boolean wellFormed)

Indicate whether the content handler can handle a stream of events that is merely well-balanced, or whether it can only handle a well-formed sequence.

isUndeclareNamespaces

public boolean isUndeclareNamespaces()

Determine whether namespace undeclaration events (for a non-null prefix) should be notified. The default is no, because some ContentHandlers (e.g. JDOM) can't cope with them.

Returns:

true if namespace undeclarations (xmlns:p="") are output

setUndeclareNamespaces

public void setUndeclareNamespaces(boolean undeclareNamespaces)

Determine whether namespace undeclaration events (for a non-null prefix) should be notified. The default is no, because some ContentHandlers (e.g. JDOM) can't cope with them.

Parameters:

undeclareNamespaces - true if namespace undeclarations (xmlns:p="") are to be output

open

public void open()
          throws XPathException

Start of document

Specified by:

open in interface Receiver

Throws:

XPathException

close

public void close()
           throws XPathException

End of document

Specified by:

close in interface Receiver

Throws:

XPathException

startDocument

public void startDocument(int properties)
                   throws XPathException

Start of a document node.

Specified by:

startDocument in interface Receiver

Throws:

XPathException

endDocument

public void endDocument()
                 throws XPathException

Notify the end of a document node

Specified by:

endDocument in interface Receiver

Throws:

XPathException

startElement

public void startElement(int nameCode,
                         int typeCode,
                         int locationId,
                         int properties)
                  throws XPathException

Notify the start of an element

Specified by:

startElement in interface Receiver

Parameters:

nameCode - integer code identifying the name of the element within the name pool.

typeCode - integer code identifying the element's type within the name pool. The value -1 indicates the default type, xdt:untyped.

locationId - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.

properties - bit-significant properties of the element node. If there are no revelant properties, zero is supplied.

Throws:

XPathException

namespace

public void namespace(int namespaceCode,
                      int properties)
               throws XPathException

Notify a namespace. Namespaces are notified after the startElement event, and before any children for the element.

Specified by:

namespace in interface Receiver

Parameters:

namespaceCode - an integer: the top half is a prefix code, the bottom half a URI code. These may be translated into an actual prefix and URI using the name pool. A prefix code of zero represents the empty prefix (that is, the default namespace). A URI code of zero represents a URI of "", that is, a namespace undeclaration.

properties - The most important property is REJECT_DUPLICATES. If this property is set, the namespace declaration will be rejected if it conflicts with a previous declaration of the same prefix. If the property is not set, the namespace declaration will be ignored if it conflicts with a previous declaration. This reflects the fact that when copying a tree, namespaces for child elements are emitted before the namespaces of their parent element. Unfortunately this conflicts with the XSLT rule for complex content construction, where the recovery action in the event of conflicts is to take the namespace that comes last. XSLT therefore doesn't recover from this error: it sets the REJECT_DUPLICATES flag, and this is treated as a hard error.

Throws:

XPathException

attribute

public void attribute(int nameCode,
                      int typeCode,
                      java.lang.CharSequence value,
                      int locationId,
                      int properties)
               throws XPathException

Notify an attribute. Attributes are notified after the startElement event, and before any children.

Specified by:

attribute in interface Receiver

Parameters:

nameCode - The name of the attribute, as held in the name pool

typeCode - The type of the attribute, as held in the name pool. The additional bit NodeInfo.IS_DTD_TYPE may be set to indicate a DTD-derived type.

locationId - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.

properties - Bit significant value. The following bits are defined:

DISABLE_ESCAPING

Disable escaping for this attribute

NO_SPECIAL_CHARACTERS

Attribute value contains no special characters

Throws:

XPathException

startContent

public void startContent()
                  throws XPathException

Notify the start of the content, that is, the completion of all attributes and namespaces. Note that the initial receiver of output from XSLT instructions will not receive this event, it has to detect it itself. Note that this event is reported for every element even if it has no attributes, no namespaces, and no content.

Specified by:

startContent in interface Receiver

Throws:

XPathException

endElement

public void endElement()
                throws XPathException

End of element

Specified by:

endElement in interface Receiver

Throws:

XPathException

characters

public void characters(java.lang.CharSequence chars,
                       int locationId,
                       int properties)
                throws XPathException

Character data

Specified by:

characters in interface Receiver

Parameters:

chars - The characters

locationId - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.

properties - Bit significant value. The following bits are defined:

DISABLE_ESCAPING

Disable escaping for this text node

USE_CDATA

Output as a CDATA section

NO_SPECIAL_CHARACTERS

Value contains no special characters

WHITESPACE

Text is all whitespace

Throws:

XPathException

notifyNotWellFormed

protected void notifyNotWellFormed()
                            throws XPathException

The following function is called when it is found that the output is not a well-formed document. Unless the ContentHandler accepts "balanced content", this is a fatal error.

Throws:

XPathException

processingInstruction

public void processingInstruction(java.lang.String target,
                                  java.lang.CharSequence data,
                                  int locationId,
                                  int properties)
                           throws XPathException

Processing Instruction

Specified by:

processingInstruction in interface Receiver

Parameters:

target - The PI name. This must be a legal name (it will not be checked).

data - The data portion of the processing instruction

locationId - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.

properties - Additional information about the PI. The following bits are defined:

CHECKED

Data is known to be legal (e.g. doesn't contain "?>")

Throws:

XPathException

comment

public void comment(java.lang.CharSequence chars,
                    int locationId,
                    int properties)
             throws XPathException

Output a comment. Passes it on to the ContentHandler provided that the ContentHandler is also a SAX2 LexicalHandler.

Specified by:

comment in interface Receiver

Parameters:

chars - The content of the comment

locationId - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.

properties - Additional information about the comment. The following bits are defined:

CHECKED

Comment is known to be legal (e.g. doesn't contain "--")

Throws:

XPathException

getPublicId

public java.lang.String getPublicId()

Get the Public ID

Specified by:

getPublicId in interface org.xml.sax.Locator

Returns:

null (always)

See Also:

Locator.getSystemId()

getSystemId

public java.lang.String getSystemId()

Get the System ID

Specified by:

getSystemId in interface org.xml.sax.Locator

Overrides:

getSystemId in class Emitter

Returns:

the system ID giving the location of the most recent event notified

getLineNumber

public int getLineNumber()

Get the line number

Specified by:

getLineNumber in interface org.xml.sax.Locator

Returns:

the line number giving the location of the most recent event notified

See Also:

Locator.getColumnNumber()

getColumnNumber

public int getColumnNumber()

Get the column number

Specified by:

getColumnNumber in interface org.xml.sax.Locator

Returns:

-1 (always)

See Also:

Locator.getLineNumber()