Enhance StrSubstitutor to support nested ${var-${subvr}} expansion
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Key: LANG-482
URL: https://issues.apache.org/jira/browse/LANG-482
Project: Commons Lang
Issue Type: Improvement
Reporter: Rob Walker
Priority: Minor
t would be really handy of StrSubstitutor 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.
Looking at the implementation, it seems it might be a fairly straightforward
enhancement to:
private int substitute(StrBuilder buf, int offset, int length, List
priorVariables)
The code already has the cyclic map in place.
I already have code that achieves this within Apache Felix, so I will see if I
can retro-fit a similar model to the above and if so submit a patch.
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