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https://issues.apache.org/jira/browse/VELOCITY-619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636020#action_12636020
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Byron Foster commented on VELOCITY-619:
---------------------------------------
The changes to the ProxyVMContext.java file in this patch will conflict with
the same changes in the StrictPropertyAndVariable.patch in VELOCITY-619 but
this is only because they contains the exact same change, and can be ignored.
> New set modifier so that set only assigns a value when variable is not
> defined.
> -------------------------------------------------------------------------------
>
> Key: VELOCITY-619
> URL: https://issues.apache.org/jira/browse/VELOCITY-619
> Project: Velocity
> Issue Type: Improvement
> Components: Engine
> Reporter: Byron Foster
> Attachments: setBangModifier_2.patch
>
>
> Define a new #set modifier such that a variable is only set if it is not
> defined, like so:
> #set($!foo = "bar")
> If the '!' character proceeds the variable foo, then $foo will be set with
> the value of "bar" ONLY IF $foo is not defined (is not in the context).
> Otherwise if $foo is defined it will remain unchanged.
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