[jira] Commented: (VELOCITY-549) Allow directives to detect whether literals are constant

["Adam Heath (JIRA)"]

    [ 
https://issues.apache.org/jira/browse/VELOCITY-549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495762
 ] 

Adam Heath commented on VELOCITY-549:
-------------------------------------

If a directive implementation sees it's parameters are constant, it could 
evaluate them at initialization time, and substitute a more efficient version 
for evaluation at runtime.

> Allow directives to detect whether literals are constant
> --------------------------------------------------------
>
>                 Key: VELOCITY-549
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-549
>             Project: Velocity
>          Issue Type: New Feature
>          Components: Engine
>    Affects Versions: 1.5
>            Reporter: Adam Heath
>         Attachments: feature_ASTStringLiteral-expose-interpolate.patch
>
>
> Add isConstant() method to ASTStringLiteral, which exposes interpolate, so 
> that calling code can detect constant string literals.

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