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From Oliver Heger <oliver.he...@oliver-heger.de>
Subject Re: [configuration] Interpolation of variables in configuration definition files
Date Thu, 01 Jun 2006 19:12:11 GMT
Hi Gabriele,

gabriele.garuglieri@infoblu.it wrote:
> Hi all,
> i'm playing with commons-configuration HEAD, extracted from svn rep and 
> locally built.
> Suppose i have i configuration definition file like this, that i pass to 
> DefaultConfigurationBuilder , where 
> ${this.app.external.override.properties.file} is defined as a System 
> property.
> <configuration>
>   <system config-name="system" />
>   <properties config-name="extOverride" fileName=
> "${this.app.external.override.properties.file}" />
>   <properties config-name="intClasspath" fileName=
> "conf/internal.properties"/>
> </configuration>
> 
> Given that the configuration file is treated as an XMLConfiguration this 
> appears to be a legitimate construct.
> The problem is that when the subnode configuration for "extOverride" is 
> built the property that defines the filename value is interpolated against 
> the subnode configuration itself which obviously is still empty, it's a 
> sort of a cat chasing its tail.
> 
> In my opinion while building a CombinedConfiguration the interpolation for 
> the subnodes should be done against the parent  config, the 
> CombinedConfiguration itself.
> This would allow to define variables in the configuration file that could 
> be solved against the previous nodes.
> 
> Am i doing something wrong? Or is there a way to force the described 
> behaviour?
> 
> In the meanwhile, my thanks and compliments for the best and most complete 
> configuration package i've ever seen!
> 
> Gabriele
> 


yes, it should work as you expect. I will have a look at the code and 
see if something is wrong. Will report back when I find something. Thank 
you for spotting this.

Oliver

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