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From Oliver Heger <oliver.he...@oliver-heger.de>
Subject Re: [Configuration] unary statement operator support
Date Wed, 31 May 2006 18:27:57 GMT
Mikael Andersson wrote:
> Hi
> I am curious about whether there has been any work done with the
> "interpolation features"?
> 
> Thanks
> - Micke

Sorry, not yet. There was no new release of [lang] in the meantime.

Oliver

> 
> On 22/02/06, Oliver Heger <hegero@med.uni-marburg.de> wrote:
>>
>> An enhancement of the interpolation features is indeed on the agenda.
>> There is a bugzilla ticket covering this issue and providing some more
>> details:
>>
>> http://issues.apache.org/bugzilla/show_bug.cgi?id=35116
>>
>> Parts of this are already implemented. For other parts we would like to
>> make use of new classes in Commons Lang, which are not yet released.
>>
>> Oliver
>>
>> Mikael Andersson wrote:
>> > Hi Joerg,
>> > the pluggable interpolation approach would be cool.
>> >
>> > Thanks for making me aware of the composite configuration, I also need
>> to be
>> > able to override a configuration file with a map of values which this
>> seems
>> > to be able to do.
>> >
>> > Thanks for the quick reply,
>> > Micke
>> >
>> > On 22/02/06, Jörg Schaible <Joerg.Schaible@elsag-solutions.com> wrote:
>> >
>> >>Hi Mikael,
>> >>
>> >>Mikael Andersson wrote on Wednesday, February 22, 2006 11:32 AM:
>> >>
>> >>
>> >>>Hi,
>> >>>I wonder if there are plans to support the unary operator in the
>> >>>configuration files? (Given it isn't already supported, had a look at
>> >>>the project website but couldn't find any information regarding it).
>> >>>
>> >>>Would be great to have something like this supported:
>> >>>hello=Hi there ${$name ? $name : user }
>> >>>
>> >>>The reason I'm asking is because I'm having a look at
>> >>>potential libraries to
>> >>>use in a future project, and this feature is something which
>> >>>is neccessary
>> >>>for our configuration files.
>> >>
>> >>No, something like this is not supported. Configurations could refactor
>> >>the interpolation into an Interface though, so different interpolation
>> >>engines could be used (e.g. el or jexl).
>> >>
>> >>Apart from this, you might solve your problem with a
>> >>CompositeConfiguration:
>> >>
>> >>CompositeConfiguration config = new CompositeConfiguration();
>> >>config.addConfiguration(ConfigurationConverter.getConfiguration(
>> >>System.getProperties()));
>> >>config.addConfiguration(new PropertiesConfiguration("app.properties"));
>> >>config.addConfiguration(new PropertiesConfiguration(
>> App.class.getResource
>> >>("default.properties")));
>> >>
>> >>Here the defaults are stores in a file available from the class loader.
>> >>This file would contain
>> >>
>> >>name=user
>> >>
>> >>The app.properties file would contain your line:
>> >>
>> >>hello=Hi there ${name}
>> >>
>> >>And if you app is started with -Dname="John Doe" it would 
>> interpolate to
>> >>the correct value.
>> >>
>> >>- Jörg
>> >>
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>> >>
>> >>
>> >
>> >
>>
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>>
> 


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