Allow validator parameters to be set via OGNL rather than hard coding in XML
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Key: WW-2923
URL: https://issues.apache.org/struts/browse/WW-2923
Project: Struts 2
Issue Type: Improvement
Components: XML Validators
Affects Versions: 2.1.2
Environment: Standard
Reporter: Scott Stanlick
Priority: Minor
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 replaces with
an OGNL finder method.
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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