net.sf.saxon.pull

Class StaxBridge

java.lang.Object

net.sf.saxon.pull.StaxBridge

All Implemented Interfaces:

PullProvider

public class StaxBridge
extends Object
implements PullProvider

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

Field Summary

Fields inherited from interface net.sf.saxon.pull.PullProvider

ATOMIC_VALUE, ATTRIBUTE, COMMENT, END_DOCUMENT, END_ELEMENT, END_OF_INPUT, NAMESPACE, PROCESSING_INSTRUCTION, START_DOCUMENT, START_ELEMENT, START_OF_INPUT, TEXT

Constructor Summary

Constructors

Constructor and Description
StaxBridge() Create a new instance of the class

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close the event reader.
int	current() Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd().
AtomicValue	getAtomicValue() Get an atomic value.
AttributeCollection	getAttributes() Get the attributes associated with the current element.
int	getColumnNumber() Return the column number where the current document event ends.
int	getColumnNumber(int locationId)
int	getLineNumber() Return the line number where the current document event ends.
int	getLineNumber(int locationId)
NamePool	getNamePool() Get the name pool
NamespaceBinding[]	getNamespaceDeclarations() Get the namespace declarations associated with the current element.
NodeName	getNodeName() Get the NodeName identifying the name of the current node.
PipelineConfiguration	getPipelineConfiguration() Get configuration information.
String	getPublicId() Return the public identifier for the current document event.
SchemaType	getSchemaType() Get the type annotation of the current attribute or element node, or atomic value.
Location	getSourceLocator() Get the location of the current event.
CharSequence	getStringValue() Get the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.
String	getSystemId() Return the system identifier for the current document event.
String	getSystemId(int locationId)
List	getUnparsedEntities() Get a list of unparsed entities.
XMLStreamReader	getXMLStreamReader() Get the XMLStreamReader used by this StaxBridge.
static void	main(String[] args) Simple test program Usage: java StaxBridge in.xml [out.xml]
int	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 PullProvider events
int	skipToMatchingEnd() Skip the current subtree.

Methods inherited from class java.lang.Object

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

Constructor Detail

StaxBridge

public StaxBridge()

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 PullProvider 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.

Specified by:

setPipelineConfiguration in interface PullProvider

Parameters:

pipe - the pipeline configuration

getPipelineConfiguration

public PipelineConfiguration getPipelineConfiguration()

Get configuration information.

Specified by:

getPipelineConfiguration in interface PullProvider

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 int next()
         throws XPathException

Get the next event

Specified by:

next in interface PullProvider

Returns:

an integer code indicating the type of event. The code PullProvider.END_OF_INPUT is returned at the end of the sequence.

Throws:

XPathException - if a dynamic error occurs

current

public int current()

Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd(). This method does not change the position of the PullProvider.

Specified by:

current in interface PullProvider

Returns:

the current event

getAttributes

public AttributeCollection getAttributes()
                                  throws XPathException

Get the attributes associated with the current element. This method must be called only after a START_ELEMENT event has been notified. The contents of the returned AttributeCollection are guaranteed to remain unchanged until the next START_ELEMENT event, but may be modified thereafter. The object should not be modified by the client.

Attributes may be read before or after reading the namespaces of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

Specified by:

getAttributes in interface PullProvider

Returns:

an AttributeCollection representing the attributes of the element that has just been notified.

Throws:

XPathException - if a dynamic error occurs

getNamespaceDeclarations

public NamespaceBinding[] getNamespaceDeclarations()
                                            throws XPathException

Get the namespace declarations associated with the current element. This method must be called only after a START_ELEMENT event has been notified. In the case of a top-level START_ELEMENT event (that is, an element that either has no parent node, or whose parent is not included in the sequence being read), the NamespaceDeclarations object returned will contain a namespace declaration for each namespace that is in-scope for this element node. In the case of a non-top-level element, the NamespaceDeclarations will contain a set of namespace declarations and undeclarations, representing the differences between this element and its parent.

It is permissible for this method to return namespace declarations that are redundant.

The NamespaceDeclarations object is guaranteed to remain unchanged until the next START_ELEMENT event, but may then be overwritten. The object should not be modified by the client.

Namespaces may be read before or after reading the attributes of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

*

Specified by:

getNamespaceDeclarations in interface PullProvider

Returns:

the namespace declarations associated with the current START_ELEMENT event.

Throws:

XPathException - if a dynamic error occurs

skipToMatchingEnd

public int skipToMatchingEnd()
                      throws XPathException

Skip the current subtree. This method may be called only immediately after a START_DOCUMENT or START_ELEMENT event. This call returns the matching END_DOCUMENT or END_ELEMENT event; the next call on next() will return the event following the END_DOCUMENT or END_ELEMENT.

Specified by:

skipToMatchingEnd in interface PullProvider

Returns:

the matching END_DOCUMENT or END_ELEMENT event

Throws:

XPathException - if a dynamic error occurs

close

public void close()

Close the event reader. This indicates that no further events are required. It is not necessary to close an event reader after PullProvider.END_OF_INPUT has been reported, but it is recommended to close it if reading terminates prematurely. Once an event reader has been closed, the effect of further calls on next() is undefined.

Specified by:

close in interface PullProvider

getNodeName

public NodeName getNodeName()

Get the NodeName identifying the name of the current node. This method can be used after the PullProvider.START_ELEMENT, PullProvider.PROCESSING_INSTRUCTION, PullProvider.ATTRIBUTE, or PullProvider.NAMESPACE events. With some PullProvider implementations, it can also be used after PullProvider.END_ELEMENT, but this is not guaranteed: a client who requires the information at that point (for example, to do serialization) should insert an ElementNameTracker into the pipeline. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is null.

Specified by:

getNodeName in interface PullProvider

Returns:

the NodeName. The NodeName can be used to obtain the prefix, local name, and namespace URI.

getStringValue

public CharSequence getStringValue()
                            throws XPathException

Get the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.

In other situations the result is undefined and may result in an IllegalStateException.

If the most recent event was a PullProvider.START_ELEMENT, this method causes the content of the element to be read. The current event on completion of this method will be the corresponding PullProvider.END_ELEMENT. The next call of next() will return the event following the END_ELEMENT event.

Specified by:

getStringValue in interface PullProvider

Returns:

the String Value of the node in question, defined according to the rules in the XPath data model.

Throws:

XPathException - if a dynamic error occurs

getAtomicValue

public AtomicValue getAtomicValue()

Get an atomic value. This call may be used only when the last event reported was ATOMIC_VALUE. This indicates that the PullProvider is reading a sequence that contains a free-standing atomic value; it is never used when reading the content of a node.

Specified by:

getAtomicValue in interface PullProvider

Returns:

the atomic value

getSchemaType

public SchemaType getSchemaType()

Get the type annotation of the current attribute or element node, or atomic value. The result of this method is undefined unless the most recent event was START_ELEMENT, ATTRIBUTE, or ATOMIC_VALUE.

Specified by:

getSchemaType in interface PullProvider

Returns:

the type annotation.

getSourceLocator

public Location getSourceLocator()

Get the location of the current event. For an event stream representing a real document, the location information should identify the location in the lexical XML source. For a constructed document, it should identify the location in the query or stylesheet that caused the node to be created. A value of null can be returned if no location information is available.

Specified by:

getSourceLocator in interface PullProvider

Returns:

the SourceLocator giving the location of the current event, or null if no location information is available

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.

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.

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.

Returns:

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

See Also:

getLineNumber()

getSystemId

public String getSystemId(int locationId)

getLineNumber

public int getLineNumber(int locationId)

getColumnNumber

public int getColumnNumber(int locationId)

getUnparsedEntities

public List getUnparsedEntities()

Get a list of unparsed entities.

Specified by:

getUnparsedEntities in interface PullProvider

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