JEXL: status and questions

["Nikhil G. Daddikar" <ng...@celoxis.com>]

Hi Folks,

We have a concept of custom fields on our classes and we are thinking of 
introducing a 'Formula' field and hence the interest in JEXL. I have a 
few questions:

1. Does JEXL have any future or should I look at Commons EL?
2. What is the "return value" of a script? For example, if I evaluate 
"a=task.id;b=task.Name; task.Name;" the result is task.id which is an 
integer, I don't understand the logic.
3. Is there a "return" in JEXL?
4. On the syntax page it says for Scripts : Scripts can be read from a 
String, File or URL. Can anyone elaborate?


Thanks
Nikhil


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Re: JEXL: status and questions

[Henrib <hb...@gmail.com>]

Howdy,

Nikhil G. Daddikar wrote:
> 
> 1. Does JEXL have any future or should I look at Commons EL?
> 
The project is in use in multiple places but it hasn't been updated for a
long time.
I'm pushing to restart the 2.0 effort & we will see soon if this gets some
traction.

Nikhil G. Daddikar wrote:
> 
> 2. What is the "return value" of a script? For example, if I evaluate 
> "a=task.id;b=task.Name; task.Name;" the result is task.id which is an 
> integer, I don't understand the logic.
> 
Could be an RFE; I suspect that creating a block will do what you expect:
"{a=task.id;b=task.Name; task.Name;}"

Nikhil G. Daddikar wrote:
> 
> 3. Is there a "return" in JEXL?
> 
No. Could be an RFE since it makes sense to break/exit loops with a given
value. However, the idea of JEXL is a simple expression evaluator, not a
full fledge language. Using Javascript (aka Rhino) might be another option.

Nikhil G. Daddikar wrote:
> 
> 4. On the syntax page it says for Scripts : Scripts can be read from a 
> String, File or URL. Can anyone elaborate?
> 
In API terms, you can create a script in Java from:
- a String variable using it as the script source.
- an URL (like "http://...") fetching the content and using it as a script
source.
- a File (like "/tmp/myscript.jexl") from your file-system using its content
as the script source.

Hope this helps.
Cheers
Henri


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