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From "Rob Walker (JIRA)" <>
Subject [jira] Commented: (CONFIGURATION-363) Consider enhancing to allow nested variable interpolation
Date Fri, 06 Feb 2009 13:20:00 GMT


Rob Walker commented on CONFIGURATION-363:

It looks like this would be an enhancement to the StrSubstitution class in Commons Lang.

Will raise a JIRA their and also see if I can figure and submit a patch

> Consider enhancing to allow nested variable interpolation
> ---------------------------------------------------------
>                 Key: CONFIGURATION-363
>                 URL:
>             Project: Commons Configuration
>          Issue Type: Improvement
>          Components: Interpolation
>            Reporter: Rob Walker
>            Priority: Minor
> It would be really handy of Commons Configuration could support nested variable interpolation:
> org.osgi.framework.system.packages=org.osgi.framework; version=1.4.0, \
>  org.osgi.service.packageadmin; version=1.2.0, \
>  org.osgi.service.startlevel; version=1.1.0, \
>  org.osgi.service.url; version=1.0.0, \
>  org.osgi.util.tracker; version=1.3.3 \
>  ${jre-${java.specification.version}}
> The process being to expand innermost variable references first and work outwards - this
allows for very advance config, such as the above, which can dynamically detect the Java version
and expand a JRE version specific property into the property being defined.
> Care is needed to avoid recursion, which can been handled through use of a "Cycle Map"
that detects of an inner variable has already been referenced. 
> An example of this can be found in the substVars method of the Apache Felix org.apache.felix.framework.util.Util

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