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From "Lukasz Lenart (JIRA)" <>
Subject [jira] [Commented] (WW-2923) Allow validator parameters to be set via OGNL rather than hard coding in XML
Date Thu, 11 Oct 2012 14:15:02 GMT


Lukasz Lenart commented on WW-2923:

It isn't implemented, but there is a bit of work as each validator must be refactored.
> Allow validator parameters to be set via OGNL rather than hard coding in XML
> ----------------------------------------------------------------------------
>                 Key: WW-2923
>                 URL:
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: XML Validators
>    Affects Versions: 2.1.2
>         Environment: Standard
>            Reporter: Scott Stanlick
>            Priority: Minor
>             Fix For: 2.3.6
> I have been experimenting with a softer way to perform validations.  I like the idea
of externalizing the validations in XML, however, it would be more flexible if the parameters
could be "set" using matches from the ValueStack rather than requiring them to be hardcoded
in the XML.  I have drilled into the validator creation and believe that the ValidatorConfig.Builder(ValidatorConfig
cfg) might be the place to check for ${foo}.  There are many other places in the framework
where this string is searched for and its content replaced by using an OGNL search.
> In my current use case, I am fetching valid ranges from a database according to user
inputs.  These varying integers are what I would like to use as my min and max values.  I
realize I could use an expression type validation or just code the validation inside my action.
 However, it doesn't seem natural to be forced into an alternative technique with the ValueStack
being so central to the framework.  It seems that if the value stack can be used for the validator
message "Age must be between ${min} and ${max}" it should also be available for fetching constraints.
> 	<field name="age">
> 		<field-validator type="int">
> 			<param name="min">${minLimit}</param>
> 			<param name="max">${maxLimit}</param>
> 			<message>Age must be between ${minLimit} and ${maxLimit}</message>
> 		</field-validator>
> 	</field>
> Peace,
> Scott

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