net.sf.saxon.evpull

Class StaxEventBridge

Implemented Interfaces:
EventIterator, Locator, LocationProvider, PullEvent, SaxonLocator, SourceLocator, SourceLocationProvider

public class StaxEventBridge
extends java.lang.Object
implements EventIterator, SaxonLocator, SourceLocationProvider

This class implements the Saxon EventIterator API on top of a standard StAX parser (or any other StAX XMLStreamReader implementation)

Constructor Summary

StaxEventBridge()
Create a new instance of the class

Method Summary

int
getColumnNumber()
Return the column number where the current document event ends.
int
getLineNumber()
Return the line number where the current document event ends.
int
getLineNumber(long locationId)
Get the line number within the document or module containing a particular location
NamePool
getNamePool()
Get the name pool
PipelineConfiguration
getPipelineConfiguration()
Get configuration information.
String
getPublicId()
Return the public identifier for the current document event.
String
getSystemId()
Return the system identifier for the current document event.
String
getSystemId(long locationId)
Get the URI of the document or module containing a particular location
List
getUnparsedEntities()
Get a list of unparsed entities.
XMLStreamReader
getXMLStreamReader()
Get the XMLStreamReader used by this StaxBridge.
boolean
isFlatSequence()
Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators
static void
main(String[] args)
Simple test program Usage: java StaxBridge in.xml [out.xml]
PullEvent
next()
Get the next event
void
setInputStream(String systemId, InputStream inputStream)
Supply an input stream containing XML to be parsed.
void
setPipelineConfiguration(PipelineConfiguration pipe)
Set configuration information.
void
setXMLStreamReader(XMLStreamReader reader)
Supply an XMLStreamReader: the events reported by this XMLStreamReader will be translated into EventIterator events

Constructor Details

StaxEventBridge

public StaxEventBridge()
Create a new instance of the class

Method Details

getColumnNumber

public int getColumnNumber()
Return the column number where the current document event ends. This is one-based number of Java char values since the last line end.

Warning: The return value from the method is intended only as an approximation for the sake of diagnostics; it is not intended to provide sufficient information to edit the character content of the original XML document. For example, when lines contain combining character sequences, wide characters, surrogate pairs, or bi-directional text, the value may not correspond to the column in a text editor's display.

The return value is an approximation of the column number in the document entity or external parsed entity where the markup triggering the event appears.

If possible, the SAX driver should provide the line position of the first character after the text associated with the document event. The first column in each line is column 1.

Returns:
The column number, or -1 if none is available.
See Also:
getLineNumber

getLineNumber

public int getLineNumber()
Return the line number where the current document event ends. Lines are delimited by line ends, which are defined in the XML specification.

Warning: The return value from the method is intended only as an approximation for the sake of diagnostics; it is not intended to provide sufficient information to edit the character content of the original XML document. In some cases, these "line" numbers match what would be displayed as columns, and in others they may not match the source text due to internal entity expansion.

The return value is an approximation of the line number in the document entity or external parsed entity where the markup triggering the event appears.

If possible, the SAX driver should provide the line position of the first character after the text associated with the document event. The first line is line 1.

Returns:
The line number, or -1 if none is available.

getLineNumber

public int getLineNumber(long locationId)
Get the line number within the document or module containing a particular location
Specified by:
getLineNumber in interface LocationProvider
Parameters:
locationId - identifier of the location in question (as passed down the Receiver pipeline)
Returns:
the line number within the document or module.

getNamePool

public NamePool getNamePool()
Get the name pool
Returns:
the name pool

getPipelineConfiguration

public PipelineConfiguration getPipelineConfiguration()
Get configuration information.
Returns:
the pipeline configuration

getPublicId

public String getPublicId()
Return the public identifier for the current document event.

The return value is the public identifier of the document entity or of the external parsed entity in which the markup triggering the event appears.

Returns:
A string containing the public identifier, or null if none is available.
See Also:
getSystemId

getSystemId

public String getSystemId()
Return the system identifier for the current document event.

The return value is the system identifier of the document entity or of the external parsed entity in which the markup triggering the event appears.

If the system identifier is a URL, the parser must resolve it fully before passing it to the application. For example, a file name must always be provided as a file:... URL, and other kinds of relative URI are also resolved against their bases.

Returns:
A string containing the system identifier, or null if none is available.

getSystemId

public String getSystemId(long locationId)
Get the URI of the document or module containing a particular location
Specified by:
getSystemId in interface LocationProvider
Parameters:
locationId - identifier of the location in question (as passed down the Receiver pipeline)
Returns:
the URI of the document or module.

getUnparsedEntities

public List getUnparsedEntities()
Get a list of unparsed entities.

getXMLStreamReader

public XMLStreamReader getXMLStreamReader()
Get the XMLStreamReader used by this StaxBridge. This is available only after setInputStream() or setXMLStreamReader() has been called
Returns:
the instance of XMLStreamReader allocated when setInputStream() was called, or the instance supplied directly to setXMLStreamReader()

isFlatSequence

public boolean isFlatSequence()
Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators
Specified by:
isFlatSequence in interface EventIterator
Returns:
true if the next() method is guaranteed never to return an EventIterator

main

public static void main(String[] args)
            throws Exception
Simple test program Usage: java StaxBridge in.xml [out.xml]
Parameters:
args - command line arguments

next

public PullEvent next()
            throws XPathException
Get the next event
Specified by:
next in interface EventIterator
Returns:
the next event; or null to indicate the end of the event stream

setInputStream

public void setInputStream(String systemId,
                           InputStream inputStream)
            throws XPathException
Supply an input stream containing XML to be parsed. A StAX parser is created using the JAXP XMLInputFactory.
Parameters:
systemId - The Base URI of the input document
inputStream - the stream containing the XML to be parsed
Throws:
XPathException - if an error occurs creating the StAX parser

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration pipe)
Set configuration information. This must only be called before any events have been read.
Parameters:
pipe - the pipeline configuration

setXMLStreamReader

public void setXMLStreamReader(XMLStreamReader reader)
Supply an XMLStreamReader: the events reported by this XMLStreamReader will be translated into EventIterator events
Parameters:
reader - the supplier of XML events, typically an XML parser