I want to be able to validate the fields on a form using the same rules that are used to validate the domain object that represents those

Rules ..without having to check each single field  that is input with the idea to be able to validate a single field without having to create the whole domain

Object.

Example:

If we have a domain object say

            Patron

String Name

                        String phoneNumber

And you have a form with the fields represented as Strings in a request.

            Name

            PhoneNumber

And if the user enters his phone number I just want to run the rule about phonenumber without firing the rule for name.

The first idea was to create a class for each form field which would leverage the power of the rule engine for example:

When

            Patron(phoneNumber not matches “ \(?\d{3}\)? ?\d{3}[-.]\d{4}”)

||

      PhoneNumber(value not matches “ \(?\d{3}\)? ?\d{3}[-.]\d{4}”

Then

      InsertLogical(Message(“Bad Phone”)

But that would mean creating a class for each field, which just seems wrong.


Is there a better design?

Blair Christie