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 <[EMAIL PROTECTED]> 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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