net.sf.saxon.event
Class ContentHandlerProxy

java.lang.Object
  extended by net.sf.saxon.event.ContentHandlerProxy
All Implemented Interfaces:
Result, Receiver
Direct Known Subclasses:
TypedContentHandler

public class ContentHandlerProxy
extends Object
implements Receiver

A ContentHandlerProxy is a Receiver that converts events into the form expected by an underlying SAX2 ContentHandler. Relevant events (notably comments) can also be fed to a LexicalHandler.

Note that in general the output passed to a Receiver 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

The ContentHandlerProxy can also be nominated as a TraceListener, to receive notification of trace events. This will be done automatically if the option setTraceListener(


Nested Class Summary
 class ContentHandlerProxy.ContentHandlerProxyTraceListener
          Create a TraceListener that will collect information about the current location in the source document.
 
Field Summary
protected  ContentHandler handler
           
protected  LexicalHandler lexicalHandler
           
protected  AttributeCollectionImpl pendingAttributes
           
 
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, CharSequence value, int locationId, int properties)
          Notify an attribute.
 void characters(CharSequence chars, int locationId, int properties)
          Character data
 void close()
          Notify the end of the event stream
 void comment(CharSequence chars, int locationId, int properties)
          Output a comment.
 void endDocument()
          Notify the end of the document
 void endElement()
          End of element
 Configuration getConfiguration()
          Get the Saxon configuration
 long getCurrentLocationId()
          Get the current location identifier
 LocationProvider getLocationProvider()
          Get the location provider
 PipelineConfiguration getPipelineConfiguration()
          Get the pipeline configuration
 String getSystemId()
          Get the System ID of the destination tree
 ContentHandlerProxy.ContentHandlerProxyTraceListener getTraceListener()
          Get the associated TraceListener that receives notification of trace events
 ContentHandler getUnderlyingContentHandler()
          Get the underlying content handler
 boolean isRequireWellFormed()
          Ask 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()
          Ask 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()
          Notify the start of the event stream
 void processingInstruction(String target, CharSequence data, int locationId, int properties)
          Processing Instruction
 void setLexicalHandler(LexicalHandler handler)
          Set the Lexical Handler to be used.
 void setOutputProperties(Properties details)
          Set the output details.
 void setPipelineConfiguration(PipelineConfiguration pipe)
          Set the pipeline configuration
 void setRequireWellFormed(boolean wellFormed)
          Set 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 setSystemId(String systemId)
          Set the System ID of the destination tree
 void setUndeclareNamespaces(boolean undeclareNamespaces)
          Set whether namespace undeclaration events (for a non-null prefix) should be notified.
 void setUnderlyingContentHandler(ContentHandler handler)
          Set the underlying content handler.
 void setUnparsedEntity(String name, String systemID, String publicID)
          Notify an unparsed entity URI.
 void startContent()
          Notify the start of the content, that is, the completion of all attributes and namespaces.
 void startDocument(int properties)
          Notify the start of the document.
 void startElement(int nameCode, int typeCode, int locationId, int properties)
          Notify the start of an element
 boolean usesTypeAnnotations()
          Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

handler

protected ContentHandler handler

lexicalHandler

protected LexicalHandler lexicalHandler

pendingAttributes

protected AttributeCollectionImpl pendingAttributes
Constructor Detail

ContentHandlerProxy

public ContentHandlerProxy()
Method Detail

setUnderlyingContentHandler

public void setUnderlyingContentHandler(ContentHandler handler)
Set the underlying content handler. This call is mandatory before using this Receiver. If the content handler is an instance of LexicalHandler, then it will also receive notification of lexical events such as comments.

Parameters:
handler - the SAX content handler to which all events will be directed

getUnderlyingContentHandler

public ContentHandler getUnderlyingContentHandler()
Get the underlying content handler

Returns:
the SAX content handler to which all events are being directed

setLexicalHandler

public void setLexicalHandler(LexicalHandler handler)
Set the Lexical Handler to be used. If called, this must be called AFTER setUnderlyingContentHandler()

Parameters:
handler - the SAX lexical handler to which lexical events (such as comments) will be notified.

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration pipe)
Set the pipeline configuration

Specified by:
setPipelineConfiguration in interface Receiver
Parameters:
pipe - the pipeline configuration

getPipelineConfiguration

public PipelineConfiguration getPipelineConfiguration()
Get the pipeline configuration

Specified by:
getPipelineConfiguration in interface Receiver
Returns:
the pipeline configuration

getConfiguration

public Configuration getConfiguration()
Get the Saxon configuration

Returns:
the Saxon configuration

setSystemId

public void setSystemId(String systemId)
Set the System ID of the destination tree

Specified by:
setSystemId in interface Result
Specified by:
setSystemId in interface Receiver
Parameters:
systemId - the system ID (effectively the base URI)

getSystemId

public String getSystemId()
Get the System ID of the destination tree

Specified by:
getSystemId in interface Result
Returns:
the system ID (effectively the base URI)

getTraceListener

public ContentHandlerProxy.ContentHandlerProxyTraceListener getTraceListener()
Get the associated TraceListener that receives notification of trace events

Returns:
the trace listener. If there is no existing trace listener, then a new one will be created.

getLocationProvider

public LocationProvider getLocationProvider()
Get the location provider

Returns:
the location provider, used to map location ids to actual URIs and line numbers

getCurrentLocationId

public long getCurrentLocationId()
Get the current location identifier

Returns:
the location identifier of the most recent event. This can be translated to real location information by passing it to the location provider.

setUnparsedEntity

public void setUnparsedEntity(String name,
                              String systemID,
                              String publicID)
                       throws XPathException
Notify an unparsed entity URI. This implementation does nothing: the event is ignored.

Specified by:
setUnparsedEntity in interface Receiver
Parameters:
name - The name of the unparsed entity
systemID - The system identifier of the unparsed entity
publicID - The public identifier of the unparsed entity
Throws:
XPathException

setOutputProperties

public void setOutputProperties(Properties details)
                         throws XPathException
Set the output details.

Parameters:
details - the serialization properties. The only values used by this implementation are SaxonOutputKeys.REQUIRE_WELL_FORMED and SaxonOutputKeys.UNDECLARE_PREFIXES.
Throws:
XPathException

isRequireWellFormed

public boolean isRequireWellFormed()
Ask 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.

Returns:
true if the content handler requires the event stream to represent a well-formed XML document (containing exactly one top-level element node and no top-level text nodes)

setRequireWellFormed

public void setRequireWellFormed(boolean wellFormed)
Set 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. The default is false.

Parameters:
wellFormed - set to true if the content handler requires the event stream to represent a well-formed XML document (containing exactly one top-level element node and no top-level text nodes). Otherwise, multiple top-level elements and text nodes are allowed, as in the XDM model.

isUndeclareNamespaces

public boolean isUndeclareNamespaces()
Ask 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 to be output

setUndeclareNamespaces

public void setUndeclareNamespaces(boolean undeclareNamespaces)
Set 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
Notify the start of the event stream

Specified by:
open in interface Receiver
Throws:
XPathException

close

public void close()
           throws XPathException
Notify the end of the event stream

Specified by:
close in interface Receiver
Throws:
XPathException

startDocument

public void startDocument(int properties)
                   throws XPathException
Notify the start of the document.

Specified by:
startDocument in interface Receiver
Parameters:
properties - bit-significant integer indicating properties of the document node. The definitions of the bits are in class ReceiverOptions
Throws:
XPathException

endDocument

public void endDocument()
                 throws XPathException
Notify the end of the document

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, xs:untyped.
locationId - an integer which can be interpreted using a LocationProvider 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. The definitions of the bits are in class ReceiverOptions
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,
                      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.
value - the string value of the attribute
locationId - an integer which can be interpreted using a LocationProvider 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(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 LocationProvider 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
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(String target,
                                  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 LocationProvider 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(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 LocationProvider 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

usesTypeAnnotations

public boolean usesTypeAnnotations()
Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events

Specified by:
usesTypeAnnotations in interface Receiver
Returns:
true if the Receiver makes any use of this information. If false, the caller may supply untyped nodes instead of supplying the type annotation


Copyright (c) Saxonica Limited. All rights reserved.