You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@commons.apache.org by Matt Goodwin <mg...@metalexis.com> on 2005/01/28 20:35:46 UTC
[betwixt] object<->string conversion .betwixt file
I have been able to be able to write out a bean with a date to a format
other than the default by specifying an options parameter and doing a
quick hack
to the betwixt source. Here is the .betwixt file.
<?xml version='1.0' ?>
<info>
<element name='ActivitySummary'>
<element name='CommissionsYTD' property='commissionsYTD'/>
<element name='LastCommissionAmt' property='lastCommissionAmt'/>
<element name='LastCommissionDate' property='lastCommissionDate'>
<option>
<name>org.apache.commons.betwixt.object-string-converter</name>
<value>com.equitrust.util.betwixt.strategy.SegDateObjectStringConverter</value>
</option>
</element>
<element name='PremiumYTD' property='premiumYTD'/>
</element>
</info>
I modded the source in the AbstractBeanWriter in the convertToString
method by just simply checking of the existence of the option for
object-string-converter and then instantiating the converter specified.
Real ugly hack, but it works. However, this does not work for string to
object conversion because digester just uses the objectStringConverter
on the BindingConfiguration. I've been trying to trace through and see
where
the objectStringConverter is set on the BindingConfiguration and see
what ways I can override this with the .betwixt file. Does anyone see a
way I can do this? I'd like to be able to specify everything in the
.betwixt file so I don't have to specify my converter in code, and also
in case I need to use a different format for a different element (it
appears that the converter when registering it will convert all elements
of the type - in my case date - using the same converter). Open to any
ideas.
Thanks,
Matt
p.s. If you see a better way to do the ObjectToString conversion besides
my hack, please input that as well
--
Matt Goodwin
mgoodwin@metalexis.com
(515)708-0114
Metalexis
"Transcending the Ordinary"
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [betwixt] object<->string conversion .betwixt file
Posted by Matt Goodwin <mg...@metalexis.com>.
Thanks for the response. I briefly took a look at flavour, but it
appeared to be something that wasn't supported currently and not having
looked at a roadmap or anything I was a little nervous to use it since I
didn't know what the actual intended use was (outside of one post that
briefly discussed flavour). Sorry to hear about your development
machine, best wishes with that. I took your advice and worked up
something. It's kind of a combination of what you suggested. I've got
it working. Basically, I'm setting 2 options variables. 1) The
classname of the objectStringConverter and 2) the classname of a
Converter class that ConvertUtils will use. I did this because it
seemed to stick as close to the current implementation as I could. I
modified the Updater interface to take a 3rd parameter - an instance of
an ObjectStringConverter. I use that to do the conversion. I pass the
Converter class through in a context variable and use that with
ConvertUtils. I'm hoping that the ConvertUtils.register and
ConvertUtils.deregister isn't too much of a performace drag. I will try
to put a patch out there tomorrow (or asap - wife is 1 week overdue with
a little one so it's anyday). Take a look and let me know what you think.
Thanks,
Matt
robert burrell donkin wrote:
>hi matt
>
>this kind of scenario was intended to be supported by the flavour
>parameter passed into the converter. the idea was that the flavour is an
>arbitrary string which could be set either in a betwixt file or by some
>course grained strategy. if the converter understood the flavour then it
>could perform the appropriate conversion.
>
>my main development machine recently blew up on me and i'm still in the
>process of configuring my secondary machine for apache development. so
>i'm not really in a position to do much development right now. there's a
>chance that support for flavours in dot betwixt files has already been
>added. if not, then perhaps you'd like to replace your workaround with
>an implementation that allows the flavour of the conversion to be set by
>an attribute in the betwixt file. i'd be very happy to review any such
>contribute if you'd like to donate it to apache. (the best way is by
>submitting a patch through bugzilla). please consider adding unit tests
>and documentation.
>
>i do agree that it would be cool to be able to interrogate the options
>for the current element within the converter. perhaps it would be
>possible to add this information to the context (perhaps through a magic
>variable) or just by adding an extra signature to the
>ObjectStringConverter. that would allow a default implementation to
>instantiate a converter to delegate to based on a magic option (just as
>you had it). i like this solution but suspect that it would probably
>require a little more effort that adding flavour support.
>
>i'd probably support both mechanisms and be willing to review
>contributed patchs.
>
>on a more general note, i'm now wondering whether it might be a good
>idea to allow the binding configuration to be specified within a betwixt
>file (possibly by use of a factory class). comments welcomed :)
>
>- robert
>
>On Fri, 2005-01-28 at 19:35, Matt Goodwin wrote:
>
>
>>I have been able to be able to write out a bean with a date to a format
>>other than the default by specifying an options parameter and doing a
>>quick hack
>>to the betwixt source. Here is the .betwixt file.
>><?xml version='1.0' ?>
>><info>
>> <element name='ActivitySummary'>
>> <element name='CommissionsYTD' property='commissionsYTD'/>
>> <element name='LastCommissionAmt' property='lastCommissionAmt'/>
>> <element name='LastCommissionDate' property='lastCommissionDate'>
>> <option>
>>
>><name>org.apache.commons.betwixt.object-string-converter</name>
>>
>><value>com.equitrust.util.betwixt.strategy.SegDateObjectStringConverter</value>
>> </option>
>> </element>
>> <element name='PremiumYTD' property='premiumYTD'/>
>> </element>
>></info>
>>
>>I modded the source in the AbstractBeanWriter in the convertToString
>>method by just simply checking of the existence of the option for
>>object-string-converter and then instantiating the converter specified.
>>Real ugly hack, but it works. However, this does not work for string to
>>object conversion because digester just uses the objectStringConverter
>>on the BindingConfiguration. I've been trying to trace through and see
>>where
>>the objectStringConverter is set on the BindingConfiguration and see
>>what ways I can override this with the .betwixt file. Does anyone see a
>>way I can do this? I'd like to be able to specify everything in the
>>.betwixt file so I don't have to specify my converter in code, and also
>>in case I need to use a different format for a different element (it
>>appears that the converter when registering it will convert all elements
>>of the type - in my case date - using the same converter). Open to any
>>ideas.
>>
>>Thanks,
>>
>>Matt
>>p.s. If you see a better way to do the ObjectToString conversion besides
>>my hack, please input that as well
>>
>>
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
>
--
Matt Goodwin
mgoodwin@metalexis.com
(515)708-0114
Metalexis
"Transcending the Ordinary"
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org
Re: [betwixt] object<->string conversion .betwixt file
Posted by robert burrell donkin <ro...@blueyonder.co.uk>.
hi matt
this kind of scenario was intended to be supported by the flavour
parameter passed into the converter. the idea was that the flavour is an
arbitrary string which could be set either in a betwixt file or by some
course grained strategy. if the converter understood the flavour then it
could perform the appropriate conversion.
my main development machine recently blew up on me and i'm still in the
process of configuring my secondary machine for apache development. so
i'm not really in a position to do much development right now. there's a
chance that support for flavours in dot betwixt files has already been
added. if not, then perhaps you'd like to replace your workaround with
an implementation that allows the flavour of the conversion to be set by
an attribute in the betwixt file. i'd be very happy to review any such
contribute if you'd like to donate it to apache. (the best way is by
submitting a patch through bugzilla). please consider adding unit tests
and documentation.
i do agree that it would be cool to be able to interrogate the options
for the current element within the converter. perhaps it would be
possible to add this information to the context (perhaps through a magic
variable) or just by adding an extra signature to the
ObjectStringConverter. that would allow a default implementation to
instantiate a converter to delegate to based on a magic option (just as
you had it). i like this solution but suspect that it would probably
require a little more effort that adding flavour support.
i'd probably support both mechanisms and be willing to review
contributed patchs.
on a more general note, i'm now wondering whether it might be a good
idea to allow the binding configuration to be specified within a betwixt
file (possibly by use of a factory class). comments welcomed :)
- robert
On Fri, 2005-01-28 at 19:35, Matt Goodwin wrote:
> I have been able to be able to write out a bean with a date to a format
> other than the default by specifying an options parameter and doing a
> quick hack
> to the betwixt source. Here is the .betwixt file.
> <?xml version='1.0' ?>
> <info>
> <element name='ActivitySummary'>
> <element name='CommissionsYTD' property='commissionsYTD'/>
> <element name='LastCommissionAmt' property='lastCommissionAmt'/>
> <element name='LastCommissionDate' property='lastCommissionDate'>
> <option>
>
> <name>org.apache.commons.betwixt.object-string-converter</name>
>
> <value>com.equitrust.util.betwixt.strategy.SegDateObjectStringConverter</value>
> </option>
> </element>
> <element name='PremiumYTD' property='premiumYTD'/>
> </element>
> </info>
>
> I modded the source in the AbstractBeanWriter in the convertToString
> method by just simply checking of the existence of the option for
> object-string-converter and then instantiating the converter specified.
> Real ugly hack, but it works. However, this does not work for string to
> object conversion because digester just uses the objectStringConverter
> on the BindingConfiguration. I've been trying to trace through and see
> where
> the objectStringConverter is set on the BindingConfiguration and see
> what ways I can override this with the .betwixt file. Does anyone see a
> way I can do this? I'd like to be able to specify everything in the
> .betwixt file so I don't have to specify my converter in code, and also
> in case I need to use a different format for a different element (it
> appears that the converter when registering it will convert all elements
> of the type - in my case date - using the same converter). Open to any
> ideas.
>
> Thanks,
>
> Matt
> p.s. If you see a better way to do the ObjectToString conversion besides
> my hack, please input that as well
---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org