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From Sergey Beryozkin <>
Subject Re: XSLTJaxbProvider and json
Date Sun, 31 Jul 2011 18:51:06 GMT
> Well, this might be getting a bit involved for this forum, but if anyone has
> any thoughts I would very much so appreciate hearing them.
> I am close to getting the XsltJsonProvider working. I actually have it
> working for writing, but I've run into a conceptual roadblock getting it to
> work for reading.
> I basically merged XsltJaxbProvider with JsonProvider (at least to get it
> working), and in the marshalToOutputStream method I just passed in the
> streamwriter for handling json.
> 	protected void marshalToOutputStream(Marshaller ms, Object obj,
> 			OutputStream os, MediaType mt, XMLStreamWriter writer)
> 			throws Exception {
> 		TransformerHandler th = factory.newTransformerHandler(createTemplates(
> 				getOutTemplates(mt), outParamsMap, outProperties));
> 		// Result result = new StreamResult(os);
> 		Result result = new StaxResult(writer);
> 		if (systemId != null) {
> 			result.setSystemId(systemId);
> 		}
> 		th.setResult(result);
> 		ms.marshal(obj, th);
> 	}
> So the xslt is applied and then is written using jettison. Works great! :)
> I'm actually not familiar enough with these API's to know for sure what is
> going on in the marshal method, but my guess is that the Object is being
> converted to xml with jaxb, the xslt is then applied, then it is written it
> to the output stream using the jettison writer which converts the xml to
> json as it is being written.
It is correct, yes.

> If this is correct then the reverse, reading/unmarshaling, would first have
> to convert the json to xml, apply the xslt, and then use jaxb to construct
> the object. Unlike with writing though, I am not seeing a way to hand a
> jettison reader and a filter to the unmarshaller all at once.'Plain' JAXBElementProvider
and JSONProvider extend AbstractJAXBProvider.
I guess XSLT

> I am trying something like the following (with multiple variations), to no
> avail ...
> XMLFilter filter = factory.newXMLFilter(createTemplates(
> 		getInTemplates(mt), inParamsMap, inProperties));
> StaxSource source2 = new StaxSource(xsw); //where xsw is a XmlStreamReader
> for handling json
> response = unmarshaller.unmarshal(??);
> Unlike with marshaling I am just not seeing a way to get those two concepts
> together. Is there not a way to do this in one step, and so I should
> manually convert the json to xml first? Am I misunderstanding how this whole
> thing works?
> Again, I can provide more code if it would be useful, and any insight is
> greatly appreciated. :)
Have a look at XSLTJaxbProvider. At the moment, the reader is copied to 
CashedOutputStream and only then the template is applied to the 
InputStream obtained from the cashed output stream. May be there's even 
a more effective way to achieve the transformation.
Let us know please if that approach works for you

Cheers, Sergey

> -Bob
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