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https://issues.apache.org/jira/browse/VELOCITY-692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673391#action_12673391
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Nathan Bubna commented on VELOCITY-692:
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No, #if( $foo == $null ) only checks to see if the RHS equals the LHS. This
is different from #if( $foo ) which tries to evaluate $foo to a boolean value.
That evaluation process is not used when there are two sides and an operator
between them.
> have #if handle empty strings/arrays/collections/maps more conveniently
> -----------------------------------------------------------------------
>
> Key: VELOCITY-692
> URL: https://issues.apache.org/jira/browse/VELOCITY-692
> Project: Velocity
> Issue Type: New Feature
> Components: Engine
> Reporter: Nathan Bubna
> Priority: Trivial
>
> An idea from the dev list:
> -------------------------------------------------------------------------------------------------
> On Sat, Feb 7, 2009 at 3:41 PM, <[email protected]> wrote:
> > Hello,
> > I wanted to share with you a few ideas I have about new simple
> > improvements for DisplayTools. I should be able to make patches for
> > them if you are interested.
> >
> > 1. Add new method
> >
> > isEmpty(object)
> >
> > that will return true if the object is null or empty (for strings it's
> > zero length; for collections, maps and arrays it's zero size). This
> > should help with annoying null checks. (Probably a better place for
> > this method would be Engine, not Tools)
> yeah, not something for tools. would be interesting to have the
> Uberspect pretend that every non-null reference has an isEmpty()
> method, or perhaps just add 0-length strings, empty collections, empty
> maps and 0-length arrays to the list of things that #if( $foo )
> considers false.
> -------------------------------------------------------------------------------------------------
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