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https://issues.apache.org/jira/browse/TEXT-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561581#comment-16561581
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Jean-Baptiste REICH commented on TEXT-127:
------------------------------------------
My purpose is to manage this kind of use case:
Assuming that ${var} is unknown when I have this:
{code:java}
String templateString = "Current behavior: $${var} ${var}.";{code}
This results in
{code:java}
String replacedString = "Current behavior: ${var} ${var}.";{code}
So I would like to avoid using an unknown variable. For this, I would like to
have this behavior:
{code:java}
String templateString = "Var is unknown: $${var} ${var}.";
==> throws an exception{code}
{code:java}
String templateString = "Var is unknown: $${var} ${var:-value1}.";
String replacedString = "Var is unknown: ${var} value1.";{code}
{code:java}
String templateString = "Var is known and equals to value2: $${var} ${var}.";
String replacedString = "Var is known and equals to value2: ${var}
value2.";{code}
{code:java}
String templateString = "Var is known and equals to value2: $${var}
${var:-value1}.";
String replacedString = "Var is known and equals to value2: ${var}
value2.";{code}
Thank you
> 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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