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From robert burrell donkin <robertburrelldon...@blueyonder.co.uk>
Subject Re: Can Betwixt/Digester directly access public data membersw/ogetters/setters?
Date Wed, 14 Dec 2005 22:30:30 GMT
On Wed, 2005-12-14 at 15:47 +0000, Guillermo Bares wrote:
> I would like to help to code betwixt support.  The approach I mentioned 
> seemed to me to a step in that direction.  If you have another approach in 
> mind I would be glad to hear it.  Please let me know what you have in mind, 
> and I will look into it.

great :)

first some information...

if you haven't already please take a few minutes to browse the jakarta
(http://jakarta.apache.org/commons/patches.html) and ASF
(http://www.apache.org/dev) websites. i prefer test-driven development
but whether you do or not, it's very important to have unit tests for
all development. 

please use bugzilla (http://issues.apache.org) to submit patches (the
list strips most attachments). of course i'm sure you know that any
contributed code needs to be original work developed by yourself that
you are feel to license to us (sorry about the legalese but that's the
way things seem to be going these days...). patches need to be against
trunk (so you'll need to check out from subversion - see
http://www.apache.org/dev/version-control.html). ATM i use eclipse and i
find subclipse (http://subclipse.tigris.org) works well with the latest
3.2 milestone.



one of the advantages of betwixt is that you can use digester rules.
however, it's not the same as adding proper support for fields into the
core of betwixt.

i think that there are different levels of support so it's possible to
work in stages. 

start by creating a couple of new classes FieldExpression (which will
write out values of fields) and FieldUpdater (which will update POJO's
with values). it's probably best to start by leaving collectives till
later. the other expressions and updaters (especially MethodExpression
and MethodUpdater) can be used as examples. you don't need to wait
before starting this work.

once that's done, the next step would be to add introspection code.
there are two possibility: either generic strategies or dot betwixt
support. it's completely up to you which of these you want to tackle.
ideally support should include both but you probably want to focus on
the one that's going to be most useful for you first. if you let know
which would be most useful, i'll describe how to approach the problem.

- robert


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