Bind XSD element to a Java implementation?

Question

I would like to know how to bind an XML tag in a certain namespace to some implementation in Java e.g. the way Mule does with the tags defined in it's various XSD files. Is it related/done with JAXB or is that just for mapping Java beans to XML?

Regards Ola

bdoughan · Accepted Answer · 2011-02-02 21:35:42Z

1

Check out my article on JAXB and namespaces:

http://bdoughan.blogspot.com/2010/08/jaxb-namespaces.html

With JAXB you can choose the granularity at which namespace information is provided:

At the package level using @XmlSchema
At the type level using @XmlType
At the field/property level using @XmlElement and @XmlAttribute

answered Feb 2, 2011 at 21:35

bdoughan

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Marcin Michalski · Accepted Answer · 2011-02-02 20:17:35Z

0

I dont fully understad your question. Are you asking about unmarshalling ?

If so try use sth like below:

JAXBContext ctx = JAXBContext.newInstance("some.package");
Unmarshaller u = ctx.createUnmarshaller();
XMLInputFactory inFac = XMLInputFactory.newFactory();
XMLStreamReader reader = inFac.createXMLStreamReader(this.getClass().
                              getResourceAsStream("inputFile.xml"));
JAXBElement<Mule> freestyleElement = u.unmarshal(reader,Mule.class);

answered Feb 2, 2011 at 20:17

Marcin Michalski

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2 Comments

Ola Theander Over a year ago

Thanks for the answers and suggestions but it's more about binding functionality to a tag/element rather than marshaling data back and forth. Taking Mule as an example there are a set of tags for different transformations, e.g. <xslt-transformation .../> which binds to a Java class implementing a common interface AbstractTransformer and of course the actual XSLT transformation code. What I don't understand is how the tag is bound to the actual Java implementation.

Ola Theander Over a year ago

To clarify a bit more, there is a standard transformer in Mule which have the tag: <object-to-string-transformer name="ToString"/> that is implemented in a class ObjectToStringTransformer. The core of my question is, how is the tag bound to the implementing class? I suspect that the XSD is involved somehow since without refereing to the relevant XSD in the document the tag is undefined but I don't know. There is a lot of articles how to marshall/unmarshall data between Java and XML but that's for data. I have not yet found anything about binding tag to an implementation as desc. above.

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