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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