Class Stax2EventReaderAdapter

java.lang.Object

org.codehaus.stax2.ri.evt.Stax2EventReaderAdapter

All Implemented Interfaces:

Iterator<Object>, XMLEventReader, XMLEventReader2

public class Stax2EventReaderAdapter
extends Object
implements XMLEventReader2

This adapter implements parts of XMLEventReader2, the extended stream reader defined by Stax2 extension, by wrapping a vanilla Stax 1.0 XMLEventReader implementation.

Note: the implementation may be incomplete as-is, since not all features needed are necessarily accessible via basic Stax 1.0 interface. As such, two main use cases for this wrapper are:

• Serve as convenient base class for a complete implementation, which can use native accessors provided by the wrapped Stax implementation
• To be used for tasks that make limited use of Stax2 API, such that missing parts are not needed

Author:

Tatu Saloranta

Field Summary

Fields

Modifier and Type	Field	Description
protected final XMLEventReader	mReader

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Stax2EventReaderAdapter(XMLEventReader er)

Method Summary

Modifier and Type	Method	Description
void	close()
String	getElementText()
Object	getProperty(String name)
boolean	hasNext()
boolean	hasNextEvent()	Method that is similar to XMLEventReader.hasNext(), except that it can throw a XMLStreamException.
boolean	isPropertySupported(String name)	Method similar to XMLInputFactory.isPropertySupported(String), used to determine whether a property is supported by the Reader instance.
Object	next()
XMLEvent	nextEvent()
XMLEvent	nextTag()
XMLEvent	peek()
void	remove()	Note: only here because we implement Iterator interface.
boolean	setProperty(String name, Object value)	Method that can be used to set per-reader properties; a subset of properties one can set via matching XMLInputFactory2 instance.
static XMLEventReader2	wrapIfNecessary(XMLEventReader er)	Method that should be used to add dynamic support for XMLEventReader2.

Methods inherited from class Object

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

Methods inherited from interface Iterator

forEachRemaining

Field Details

mReader

protected final XMLEventReader mReader

Constructor Details

Stax2EventReaderAdapter

protected Stax2EventReaderAdapter(XMLEventReader er)

Method Details

wrapIfNecessary

public static XMLEventReader2 wrapIfNecessary(XMLEventReader er)

Method that should be used to add dynamic support for XMLEventReader2. Method will check whether the stream reader passed happens to be a XMLEventReader2; and if it is, return it properly cast. If not, it will create necessary wrapper.

close

public void close()
           throws XMLStreamException

Specified by:

close in interface XMLEventReader

Throws:

XMLStreamException

getElementText

public String getElementText()
                      throws XMLStreamException

Specified by:

getElementText in interface XMLEventReader

Throws:

XMLStreamException

getProperty

public Object getProperty(String name)

Specified by:

getProperty in interface XMLEventReader

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Object>

Specified by:

hasNext in interface XMLEventReader

nextEvent

public XMLEvent nextEvent()
                   throws XMLStreamException

Specified by:

nextEvent in interface XMLEventReader

Throws:

XMLStreamException

next

public Object next()

Specified by:

next in interface Iterator<Object>

nextTag

public XMLEvent nextTag()
                 throws XMLStreamException

Specified by:

nextTag in interface XMLEventReader

Throws:

XMLStreamException

peek

public XMLEvent peek()
              throws XMLStreamException

Specified by:

peek in interface XMLEventReader

Throws:

XMLStreamException

remove

public void remove()

Note: only here because we implement Iterator interface.

Specified by:

remove in interface Iterator<Object>

hasNextEvent

public boolean hasNextEvent()
                     throws XMLStreamException

Description copied from interface: XMLEventReader2

Method that is similar to XMLEventReader.hasNext(), except that it can throw a XMLStreamException. This is important distinction, since the underlying stream reader is NOT allowed to throw such an exception when its hasNext() gets called; but the underlying parser may well need to advance the input stream and in doing so may encounter an exception. This exception should be propagated to the caller, as it may signal a problem with the input stream or xml content.

Specified by:

hasNextEvent in interface XMLEventReader2

Throws:

XMLStreamException

isPropertySupported

public boolean isPropertySupported(String name)

Description copied from interface: XMLEventReader2

Method similar to XMLInputFactory.isPropertySupported(String), used to determine whether a property is supported by the Reader instance. This means that this method may return false for some properties that the input factory does support: specifically, it should only return true if the value is mutable on per-instance basis. False means that either the property is not recognized, or is not mutable via reader instance.

Specified by:

isPropertySupported in interface XMLEventReader2

setProperty

public boolean setProperty(String name,
 Object value)

Description copied from interface: XMLEventReader2

Method that can be used to set per-reader properties; a subset of properties one can set via matching XMLInputFactory2 instance. Exactly which methods are mutable is implementation specific.

Specified by:

setProperty in interface XMLEventReader2

Parameters:

name - Name of the property to set

value - Value to set property to.

Returns:

True, if the specified property was succesfully set to specified value; false if its value was not changed