Java(TM) Boutique - StAX and XSLT Transformations in J2SE 6.0 Mustang

Tutorials : StAX and XSLT Transformations in J2SE 6.0 Mustang :

A Transformation Based on StAXSource/StAXResult and the Event Iterator API

In the case of using the Event Iterator API, the problem lies with defining the StAXSource/StAXResult objects.

Here's how to solve this for the XSL stylesheet:

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XMLEventReader eventReaderXSL=null;
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//define the Source object for the stylesheet
XSL=new StAXSource(eventReaderXSL);

For the XML file:

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XMLEventReader eventReaderXML=null;
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//define the Source object for the XML document
XML=new StAXSource(eventReaderXML);

For the result of the transformation:

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XMLStreamWriter streamWriter=null;
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//define the Result object
Result XML_r=new StAXResult(streamWriter);

Listing 2 shows the same result as the StAX_Cursor.java, but is specific to the Event Interator API.

Notice that, in both applications, the namespace support is activated. This is very important and you must not forget to do so!

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XMLInputFactory XMLif=null;
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XMLif.setProperty("javax.xml.stream.isNamespaceAware",Boolean.TRUE);

Both and StAX_EventIterator.java and StAX_Cursor.java have the same result, shown in Figure 1.

Figure 1: The result of the XSLT transformation.

Combining StAXSources with Other XXXSources

These applications represent both the XSL stylesheet and the XML document as StAXSource objects—more out of convenience than necessity. Actually, TrAX allows you to use different XXXSources for the stylesheet and XML document. For example, the application shown in Listing 3 uses a StAXSource for the XSL stylesheet and a StreamSource (XML stream) for the XML document. The result is still the same as was shown in Figure 1.

Easier TrAX Functionality

Obviously, the new java.xml.transform.stax package provides an improvement in of flexibility and new alternatives for the TrAX API. Working with the classes in this package is simple because they can be used just like other XXXSource/XXXResult classes. This facility is smooth and intuitive—you don't need an "external" XSLT processor, you don't need to write additional methods, you don't need to "fit" a helper class, etc. Because J2SE 1.5 doesn't provide this facility, you must find a solution that is worlds apart from the pattern designed by the StreamSource/StreamResult, SAXSource/SAXResult, DOMSource/DOMResult classes. The TrAX API is just the ticket.

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