Conditional validation

emmanuel · **Posted:** Wed Dec 05, 2007 8:28 pm

But that's the first time I see a Linkage error

bruno.braga · **Joined:** Fri Nov 03, 2006 3:21 pm **Posts:** 30

hmm? Linkage error!?

emmanuel · **Posted:** Wed Dec 05, 2007 8:37 pm

ah wrong post :)

emmanuel · **Posted:** Wed Dec 05, 2007 8:39 pm

BTW, I haven't drop your use case (even if I find it fairly border case), but I still don't like the solution(s) for it. We are discussing similar topics in the JSR-303 EG

bruno.braga · **Joined:** Fri Nov 03, 2006 3:21 pm **Posts:** 30

If you have any other solution, ok.
I know the JSR 303 but I don't know when it will be completed or on what you discuss.
You could share some information or conclusion about this with us?
That your message ends the discussion of this topic?

jweb · **Joined:** Tue Dec 25, 2007 11:11 am **Posts:** 2

bruno.braga, his idea is very good. I hope that developers approve it. HV is good, but needs a few more advanced features.

Merry Christmas

dwaite · **Joined:** Sun Mar 30, 2008 12:19 am **Posts:** 15

emmanuel,

One way this might be more graceful to solve is if groups could be determined by a class to determine validation of its properties. Then rather than having applyIf on every annotation to allow specifying script, you have a base annotation that determines which set(s) to apply.

Not saying I'm ecstatic about such an approach. I rather like the idea of making new complex constraints java classes.

emmanuel · **Posted:** Mon Apr 14, 2008 2:37 pm

Can you expand on your idea?

dwaite · **Joined:** Sun Mar 30, 2008 12:19 am **Posts:** 15

emmanuel wrote:

Can you expand on your idea?

Well based on an earlier example in the thread:

Code:

@DeliveryMethod
class Delivery {
    boolean receiveNews;
    boolean phonePreferred;

    @NotNull(groups={"byAddress"}) 
    private String street;
    
    @NotNull(groups={"byAddress"})
    private String city;

    @NotNull(groups={"byAddress"})
    @Length(2)
    private String state;

    @NotNull(groups={"byAddress"})
    @Max(99999)
    @Min(0)
    private Integer zip;

    @NotNull(groups={"byPhone"}) 
    @PhoneNumber
    public String getTelephone() { 
        return telephone; 
    }
}

The DeliveryMethodValidator would expose any groups which should be used to validate the members of the class. This way, it can make high level business decisions, but the regular annotations could be used for the low level validation rules.

I also had a similar thought on leveraging groups in this way for "key" and "value" special groups, to allow validation of the individual elements of collections and maps.