Annotations binding

Implement a new superset of annotations that allows easy binding. After a long discussion, Guillaume and I come up with the following:

@BindAs
@NoBiding

@BindAs has 4 attributes: value, lang, binder
@NoBinding has 2 attributes: value

@BindAs can be used as method parameter or on field / setter / getter of an object.
@NoBinding can be used on field / setter / getter of an object.

Here are snippets of code where they could be used:

public class myController extends controller {

   public void index(@BindAs("yyyy-MM-dd") Date date) {
   }

   public void index(@BindAs("yyyy-MM-dd",lang="fr,en") Date date) {
   }

   public void myMethod(@BindAs("€####,##") Float currency) {
   }

   public void myMethod(@BindAs("€####,##",lang="fr,en") Float currency) {
   }

   public void myMethod(@BindAs("secureForm") User user) {
   }

}

With the User object as follow:

public class User {

    @BindAs("yyyy-MM-dd")
    @BindAs("yyyy-dd-MM", lang="us")
    public Date creationDate;

    @NoBinding("secureForm")
    public Boolean isAdmin;

}

Question: do we want to have @BindAs linked to a form (like "secureForm") and not only the lang?

The binder attribute of the @BindAs annotations allows you to specify your own implementation:

@BindAs(binder=MyEmailBinder.class)
public Email email;

A format attribute can be specified to @BindAs and @NoBinding allowing to refine your binding:

@BindAs(binder=MyXMLBinder.class,format="xml") or @NoBinding(format="xml")

This will allows us to do the following

Using the routes file:

GET / application.index(format:'json')

Or using the annotation:

@Get(value="/", produces="json")
public void index(@BindAs User user) {
}

with User:

public class User {

   @BindAs(value="MM-dd-yyyy", format="json")
   public Date createdDate;

}

However, as the format attribute needs more use case and will not be implemented at first. It will be an enhancement for later.

I am also wondering if the binding attribute should not be specified at the class level to avoid repetition ie:

@BindAs(binder=MyEmailBinder.class)
public class myEmail {
}

I think it makes more sense.

The name of the annotations might not be the best one. Anyone with better names?