[betwixt] plugging in code for specific fields

[St...@bnz.co.nz]

Hello

I wish to use betwixt to dump and load objects from instances of
application over which we have no control of the api. I can get it to work
for simple cases but I am unsure of the approach to take to customise it's
behaviour in the following circumstance:
1) when I'm dumping out a bean to xml which includes a field which is an id
of another object , I wish to be able to plug in some code that does a
lookup of the referenced object so that I can write out the key instead of
the id, and
2) when I reading in that xml I wish to be able to plug in code that does a
look up with the key to recover the id.

A typical example. AccountingRuleAccountConfig  has two such fields
creditAccountId and debitAccountId -

<AccountingRuleAccountConfig id="1">
    <authName>COT/Bond Trading</authName>
    <creditAccountId>3835</creditAccountId>
    <debitAccountId>3833</debitAccountId>
    <eventType>COT</eventType>
    <id>3862</id>
......
</AccountingRuleAccountConfig >

I wish to write out something like
<creditAccountKey>PREMIUM-DISCOUNT-EARNED-PL</creditAccountKey>

regards

Stephen Newman


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Re: [betwixt] plugging in code for specific fields

[robert burrell donkin <ro...@blueyonder.co.uk>]

On Tue, 2005-03-01 at 03:24, Stephen_Newman@bnz.co.nz wrote:
> Hello

hello

> I wish to use betwixt to dump and load objects from instances of
> application over which we have no control of the api. I can get it to work
> for simple cases but I am unsure of the approach to take to customise it's
> behaviour in the following circumstance:

i'm not sure that there's an out-of-the-box solution (maybe it would be
a good idea to have a pluggable substitutor) but i think that you should
be able to do it with a little effort and ingenuity...

> 1) when I'm dumping out a bean to xml which includes a field which is an id
> of another object , I wish to be able to plug in some code that does a
> lookup of the referenced object so that I can write out the key instead of
> the id, 

one approach to this would be to use a betwixt file (or any other
suitable method) to ensure that the element name is appropriate and then
use a custom ObjectStringConverter to look up the key. you'll probably
want to upgrade to a recent nightly or roll your own from CVS to take
advantage of the methods that take contexts.

> and
> 2) when I reading in that xml I wish to be able to plug in code that does a
> look up with the key to recover the id.

you might be able to use the same mechanism to look up the id in this
way as well.

there are a few other ways this might be done but this seems to me the
easiest.

- robert


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