How to set a Constraint dependent on another Constraint

[scottr]

Hi all,

I am having a problem with a validation scenario I am coding up. I have a (simplified) POJO as follows:

public class UserDefaults{ 
    private boolean isCustomer;
    private String businessName;

.. etc, etc.
}

What I want to do is create a Constraint that requires the businessName property to be valid, but only if the isCustomer property is true (otherwise don't test the businessName property).

I tried to do this in my RulesSource implementation:

private Rules createUserRules() {
    return new Rules(BatchConsSettings.class){
        protected void initRules() {
            Constraint isCustomer = eq("isCustomer", Boolean.TRUE);
                
            this.add("businessName", ifTrue(isCustomer, required("businessName")));
        }
    };
}

The problem is - this doesn't work, because the isTrue constraint is being evaluated against the value of the businessName property (which is a String, of course) and as such throws an exception because the String value has no such property "isCustomer".

Unfortunately, I can't do this...

            this.add(ifTrue(isCustomer, required("businessName")));

...because the add method only permits CompundConstraints and PropertyConstraints, not basic Constraints.

So I'm kind of stuck with this. Is such a chained constraint even possible using the existing Constraint classes, or does it require some sort of custom implementation?

-Scott

[peter]

I have the same problem !!!