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From "Rob Walker (JIRA)" <j...@apache.org>
Subject [jira] Created: (CONFIGURATION-363) Consider enhancing to allow nested variable interpolation
Date Fri, 06 Feb 2009 08:14:04 GMT
Consider enhancing to allow nested variable interpolation
---------------------------------------------------------

                 Key: CONFIGURATION-363
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-363
             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
class.



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