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https://issues.apache.org/jira/browse/VELOCITY-692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673318#action_12673318
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Sergiy Kovalchuk commented on VELOCITY-692:
-------------------------------------------
On second thought the whole checking for emptiness in #if statement feature
looks to me now like not a good idea after all.
It is nice to be able to write:
#if($list)
...list has elements, display...
#else
empty or null, nothing to display...
#end
But you won't be able to check specifically for null now, because null and
empty are now equal (both false), plus this will not be backward compatible. In
the old code you could write:
#if($list == $null)
...list is null... (but also empty now which is unexpected)
#else if($list.size() == 0)
...list has no elements (this will never execute now)
#else
..list is not empty
#end
(Until I have bad understanding of how it works)
What about new operator #ifEmpty() (or #ifNotEmpty())?
So instead of:
#if(#list && $list.size() > 0)
you can write:
#ifNotEmpty($list)
...not empty
#else
...empty
#end
Kinda mess :)
> 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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