Re: structuring pull parsing code and using serializer [Re: [xmlpull-user] Java <-> XML using XMLPull]

Hi Alek,

I hadn't realized you'd done this JaxMe sample - very interesting, I 
wish I'd seen it earlier. I assume you've seen some of the comments 
about my JiBX project (http://www.jibx.org), which I discuss briefly in 
my data binding performance comparison article at 
http://www-106.ibm.com/developerworks/library/x-databdopt2/ A pull 
parser is the basis for this data binding implementation (currently 
XMLPull, but flexible to allow going with the Java standard once it 
comes out). I've got another pair of articles coming out within the next 
couple of weeks that discuss JiBX in more detail.

In the case of JiBX I chose to wrap the pull parser interface completely 
within my unmarshalling context class, partially to avoid any 
dependencies on a particular parser API. The current CVS version 
(http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jibx/distrib/build/src/org/jibx/runtime/UnmarshallingContext.java) 
doesn't have the full set of convenience methods I've since added but is 
otherwise pretty close to the final form.

For marshalling, I use a similar context class with a variety of 
convenience methods to handle cases such as a start tag with or without 
attributes to be added, with and without content, etc. The CVS version 
of the marshalling code is lacking one refinement I've since added. In 
the CVS version I was planning to just combine namespace prefixes with 
local names directly in the code generation (essentially mapping 
namespaces to static prefixes depending on the context of an object 
within the binding definition). I've now made this dynamic, but based on 
a namespace index rather than a namespace URI. This allows me to avoid 
any runtime lookup of namespaces, while still allowing different 
prefixes to be used for the same namespace URI within a binding. It also 
allows for easy output convertion to SAX2 events or (with the aid of an 
intermediate buffer) XMLPull events.

I'm working on getting my generated binding code (which is added 
directly into the class files) past the validator right now. I expect to 
get this all on the site by Monday, so I'll follow up with another email 
once it's all online.

  - Dennis

Aleksander Slominski wrote:

>that looks reasonable and i would like to make it into a real sample. 
>please take a look on this:
>http://www.extreme.indiana.edu/~aslom/xml/databinding/jaxme-xmlpull/
>  
>


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