Constraining subtypes
---------------------
Key: QI-330
URL: http://issues.ops4j.org/browse/QI-330
Project: Qi4j
Issue Type: Improvement
Reporter: Niclas Hedhman
I have a usecase where a supertype of a composite can not declare being a Value
Composite, but all subtypes of it MUST be value composites. It is an assumption
in the design.
It would be cool to be able to put a Type Constraint on a super type, of what
the sub types of it must adhere to. For instance,
{code}
@MustBeValueComposite
public interface DomainEvent
{}
@TypeConstraints( MustBeValueCompositeContraint.class )
public @interface MustBeValueComposite
{}
public class MustBeValueCompositeConstraint extends TypeConstraint
{
public boolean isValid( Class subType, Module creationIn )
{
return subType instanceof ValueComposite;
}
}
{code}
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