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From David Graham <grahamdavid1...@yahoo.com>
Subject Re: [validator] BSF script validator
Date Mon, 24 May 2004 12:45:19 GMT
Go ahead an open a bugzilla ticket for code to be attached to.  If we're
going to distribute validators like this they should probably be in a
separate download so the core validator framework stays separate and we
can manage dependencies better.

David

--- Don Brown <mrdon@twdata.org> wrote:
> I wrote a validator that uses scripting snippets to determine validity. 
> 
> The validator uses Jakarta BSF so supports any scripting language 
> supported by BSF like BeanShell, JavaScript, Jython, Groovy (I believe),
> 
> etc.
> 
> I was starting to refactor out my app's validation code to be usable by 
> commons-validator, when I realized most of the resulting validations 
> ended up being one line.  For example, to make sure a particular 
> employee existed, the validation was simply "empFacade.getEmployee(key) 
> != null".  Rather than writing a ton of one line validator or shoving 
> them all into one umbrella validator, I decided to write this validator.
> 
> 
> Here is an example of its use:
> 
> <field property="value" depends="bsf">
>   <var>
>     <var-name>eval</var-name>
>     <var-value>value.equals("foo")</var-value>
>   </var>
> </field>
> 
> The validator works and the unit tests pass, but I'm still working on a 
> clean way to pass it business objects.  Right now, if you want to put 
> variables in the scope, you need to create your own BSFManager and 
> BSFEngine beforehand and add them as Validator parameters.  For simple 
> cases with just BeanShell, neither are required, just the usual target 
> object and Field.
> 
> Again, I can submit the code, unit tests, and patches if needed.  I 
> certainly do appreciate how flexible validator is to be able to support 
> many types of implementations.
> 
> Don
> 
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