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From "Mikael Andersson" <mail.mi...@gmail.com>
Subject Re: [Configuration] unary statement operator support
Date Wed, 22 Feb 2006 14:09:25 GMT
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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