net.sf.saxon.evpull
Class StaxToEventBridge

java.lang.Object
  net.sf.saxon.evpull.StaxToEventBridge

All Implemented Interfaces:

SourceLocator, LocationProvider, SaxonLocator, SourceLocationProvider, EventIterator, PullEvent, Locator

public class StaxToEventBridge
extends 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

StaxToEventBridge()
Create a new instance of the class

Method Summary

int	getColumnNumber() Return the column number where the current document event ends.
int	getColumnNumber(long locationId) Get the column number within the document, entity, or module containing a particular location
int	getLineNumber() Return the line number where the current document event ends.
int	getLineNumber(long locationId) Get the line number within the document, entity 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, entity, 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

Methods inherited from class java.lang.Object

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

Constructor Detail

StaxToEventBridge

public StaxToEventBridge()

Create a new instance of the class

Method Detail

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

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

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

getPipelineConfiguration

public PipelineConfiguration getPipelineConfiguration()

Get configuration information.

Returns:

the pipeline configuration

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()

getNamePool

public NamePool getNamePool()

Get the name pool

Returns:

the name pool

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

Throws:

XPathException - if a dynamic evaluation error occurs

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.

Specified by:

getPublicId in interface SourceLocator

Specified by:

getPublicId in interface Locator

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.

Specified by:

getSystemId in interface SourceLocator

Specified by:

getSystemId in interface Locator

Returns:

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

See Also:

getPublicId()

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.

Specified by:

getLineNumber in interface SourceLocator

Specified by:

getLineNumber in interface Locator

Returns:

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

See Also:

getColumnNumber()

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.

Specified by:

getColumnNumber in interface SourceLocator

Specified by:

getColumnNumber in interface Locator

Returns:

The column number, or -1 if none is available.

See Also:

getLineNumber()

getSystemId

public String getSystemId(long locationId)

Description copied from interface: LocationProvider

Get the URI of the document, entity, 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, XML entity or module. For a SourceLocationProvider this will be the URI of the document or entity (the URI that would be the base URI if there were no xml:base attributes). In other cases it may identify the query or stylesheet module currently being executed.

getLineNumber

public int getLineNumber(long locationId)

Description copied from interface: LocationProvider

Get the line number within the document, entity 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, entity or module, or -1 if no information is available.

getColumnNumber

public int getColumnNumber(long locationId)

Description copied from interface: LocationProvider

Get the column number within the document, entity, or module containing a particular location

Specified by:

getColumnNumber in interface LocationProvider

Parameters:

locationId - identifier of the location in question (as passed down the Receiver pipeline)

Returns:

the column number within the document, entity, or module, or -1 if this is not available

getUnparsedEntities

public List getUnparsedEntities()

Get a list of unparsed entities.

Returns:

a list of unparsed entities, or null if the information is not available, or an empty list if there are no unparsed entities. Each item in the list will be an instance of UnparsedEntity

main

public static void main(String[] args)
                 throws Exception

Simple test program Usage: java StaxBridge in.xml [out.xml]

Parameters:

args - command line arguments

Throws:

Exception

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