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Date: Fri, 16 Sep 2005 12:41:31 +0200
From: Christoph Reck <apache@recks.org>
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To: Velocity Users List <velocity-user@jakarta.apache.org>
Subject: Re: Comparing strings
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 <E51BD230BBA3A64B9C01EF1A20EF5AE67518@pspub1.pivotal-solutions.co.uk>
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 <E51BD230BBA3A64B9C01EF1A20EF5AE67518@pspub1.pivotal-solutions.co.uk>
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Hi Steve,

Steve O'Hara wrote:
> A while back I chastised someone for not using proper String comparison
> operators in their templates.  I looked in the Velocity code and sure
> enough "==" operators are translated into equals. So I was looking a bit
> stupid.
> 
> Somebody challenged me to come up with a situation where the equality
> "==" operator doesn't work with Strings.
> Well, finally, I've just found an example in my code;
> 
>     #if ($SummarySortField==$Field.getUdmFieldName()) 
> 
> This statement doesn't produce a true, neither does this;
> 
>     #if ($SummarySortField==${Field.getUdmFieldName()}) 

It would be helpful to know the contents and jave class behind the
references:
$SummarySortField ($SummarySortField.class.name)
$Field.getUdmFieldName() ($Field.getUdmFieldName().class.name)

> 
> But this version does:-
> 
>     #if ($SummarySortField.equalsIgnoreCase($Field.getUdmFieldName()))

Please note that equalsIgnoreCase() is not the same as equals() ;D
You can try explicetely:

#if( $SummarySortField.equals( $Field.getUdmFieldName() ) )

Which probably will also retrun false according to the first two examples..


:) Christoph


> 
> I thought perhaps I was going mad before when I raised this and plenty
> of people on this list questioned me, but can anyone explain this?
> 
> Steve 

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