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https://issues.apache.org/jira/browse/TEXT-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16562042#comment-16562042
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Sebb commented on TEXT-127:
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I think what you are asking for is:
{code:java}"${unknown:-default}" // => default (i.e. as a present}{code}
{code:java}"${unknown}" // => exception (this is new behaviour){code}
Since this is new behaviour, it has to be optional, e.g. have a method
setFailOnUndefinedVariable(boolean) which changes the behaviour where there is
no default.
> Detect when a variable is unknown in StringSubstitutor
> ------------------------------------------------------
>
> Key: TEXT-127
> URL: https://issues.apache.org/jira/browse/TEXT-127
> Project: Commons Text
> Issue Type: Improvement
> Reporter: Jean-Baptiste REICH
> Priority: Minor
>
> Currently, StringSubstitutor is not replacing a variable that is unknown. It
> would be nice to define the behavior in this case and to allow raising an
> exception.
> A workaround is to define a custom StringLookup that raises an exception when
> the variable is unknown but this prevent from using the default value feature
> from StringSubstitutor
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