Hello,
All the Validator examples that I have seen
seem to be tightly couples with Struts.
For instance, most validateXXX(...) methods
takes the following types as parameters:
Object
ValidatorAction
Field
ActionErrors
HttpServletRequest
Because of presence of ActionErrors, this is
tightly coupled to Struts.
What happens when one day we decide to
replace Struts with XYZ? We have to rewrite
a piece of this Validator.
Because of presence of HttpServletRequest,
thi is usable only in the Web App context.
What happens if we want to use this
Validator in a desktop application?
I am wondering how one would create a custom
Validator that did not have these 2
dependencies (or at least not the Struts
dependency).
If I write a custom Validator with a method
such as:
validateXXX(Object, Field)
How do I use this method in a Struts
application without passing it instances
Struts-specific classes, such as
ActionErrors, and still somehow end up with
error messages suitable for showing to the
user, etc.?
I have seen code such as the following, but
this would require that a developers
manually inserts error messages into an
instance of ActionErrors, etc. Is there no
better way?
ValidatorResources resources = new
ValidatorResources();
InputStream rules =
ValidateExample.class.getResourceAsStream("validator-rules.xml");
ValidatorResourcesInitializer.initialize(resources,
in);
InputStream forms =
ValidateExample.class.getResourceAsStream("validation.xml");
ValidatorResourcesInitializer.initialize(resources,
forms);
// Suppose we already had a CheckoutForm
object created and populated
CheckoutForm form = new CheckoutForm();
// Create a validator with the checkoutForm
Validator validator = new
Validator(resources, "checkoutForm");
// Tell the validator which bean to validate
against.
validator.addResource(Validator.BEAN_KEY, form);
// Validate the checkoutForm object and
store the validation results
ValidatorResults results = validator.validate();
Thanks.
Otis
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