[jira] Commented: (VELOCITY-619) New set modifier so that set only assigns a value when variable is not defined.

["Byron Foster (JIRA)" <de...@velocity.apache.org>]

    [ https://issues.apache.org/jira/browse/VELOCITY-619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636020#action_12636020 ] 

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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