Re: null in velocity

[Barbara Baughman]

If you are doing a test for java 'null' value, then
#if ($car.fuel)
will return true if $car.fuel is NOT a java null value.

If you are checking for an empty string, then use the String
comparison.

#if ($car.fuel=="")

If you want to check for both:
#if ($!car.fuel=="")

I have a general purpose tool with a method that checks for null or
empty or all blanks and include the tool object in all Velocity
contexts.

#if ($tool.isEmpty($car.fuel))

You may have a different requirement that would require a special
method.  Perhaps you want it to return false if fuel is null or empty
or the value 0.  Then you would have to create your own method in the
$car object.

#if ($car.hasFuel())

BTW, always use '==' instead of '=' when making comparisons in
Velocity.

Barbara Baughman
X2157

On Thu, 2 Dec 2004, THE ULTIMATE SUBBIAH wrote:

> How to check for null in velocity
> for eg. I load a class in the context Class:: car
>
> #if ($car.getFuel() = null ?? )
>
> This does not work.
> Thx
>
> _
> The happening world of BPO! Know all that you need to know!
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Re: null in velocity

[Nathan Bubna]

I find #if( "$!car" == "" ) to be the most reliable null test.

On Thu, 2 Dec 2004 14:47:29 -0500, Terry Steichen <[EMAIL PROTECTED]> wrote:
> I think you can also do something like this:
> 
> #if($car && $car == "")
> 
> That is, if $car is defined and has no value (ie, null)
> 
> 
>   - Original Message -
>   From: Shinobu Kawai
>   To: Velocity Users List
>   Sent: Thursday, December 02, 2004 10:56 AM
>   Subject: Re: null in velocity
> 
>   Hi SUBBIAH,
> 
>   > How to check for null in velocity
>   > for eg. I load a class in the context Class:: car
>   >
>   > #if ($car.getFuel() = null ?? )
> 
>   You can use NullTool
> http://wiki.apache.org/jakarta-velocity/NullTool
> 
>   #if ($null.isNull($car.fuel))
> 
>   Best regards,
>   -- Shinobu Kawai
> 
>   --
>   Shinobu Kawai <[EMAIL PROTECTED]>
> 
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>

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Re: null in velocity

[Terry Steichen]

I think you can also do something like this:

#if($car && $car == "")

That is, if $car is defined and has no value (ie, null)
  - Original Message - 
  From: Shinobu Kawai 
  To: Velocity Users List 
  Sent: Thursday, December 02, 2004 10:56 AM
  Subject: Re: null in velocity


  Hi SUBBIAH,

  > How to check for null in velocity
  > for eg. I load a class in the context Class:: car
  > 
  > #if ($car.getFuel() = null ?? )

  You can use NullTool
http://wiki.apache.org/jakarta-velocity/NullTool

  #if ($null.isNull($car.fuel))

  Best regards,
  -- Shinobu Kawai

  -- 
  Shinobu Kawai <[EMAIL PROTECTED]>

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Re: null in velocity

[Shinobu Kawai]

Hi SUBBIAH,

> How to check for null in velocity
> for eg. I load a class in the context Class:: car
> 
> #if ($car.getFuel() = null ?? )

You can use NullTool
  http://wiki.apache.org/jakarta-velocity/NullTool

#if ($null.isNull($car.fuel))

Best regards,
-- Shinobu Kawai

-- 
Shinobu Kawai <[EMAIL PROTECTED]>

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Re: null in velocity

[Edgar Poce]

The condition is evaluated to determine if it's a boolean (true/false) 
or if it's not null.

#if ($car.fuel)
...
#end
Regards
Edgar
Check http://jakarta.apache.org/velocity/user-guide.html#Conditionals
THE ULTIMATE SUBBIAH wrote:
How to check for null in velocity
for eg. I load a class in the context Class:: car
#if ($car.getFuel() = null ?? )
This does not work.
Thx
_
The happening world of BPO! Know all that you need to know! 
http://www.bpowatchindia.com/msn/ Keep in step with what’s hot!

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To unsubscribe, e-mail: [EMAIL PROTECTED]
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