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http://issues.ops4j.org/browse/QI-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950#action_13950
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Rickard Öberg commented on QI-330:
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What is the reason DomainEvent does not extend ValueComposite?
> 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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