```class XmlSessionDBCollection( private val c...

# announcements

[jojo.lichtenberger]

class XmlSessionDBCollection(
    private val ctx: RoutingContext,
    private val dbCollection: TemporalNodeCollection<AbstractTemporalNode<XmlDBNode>>, AutoCloseable,
    private val user: User
) : TemporalNodeCollection<AbstractTemporalNode<XmlDBNode>>, AutoCloseable by dbCollection {

[Shawn]

this one might look a little funny—you’ll need a generic and you’ll need to use a where clause: https://kotlinlang.org/docs/reference/generics.html#upper-bounds

[Shawn]

without generics, you would need an intersection type, and Kotlin doesn’t support representing those

[ephemient]

the compiler actually understands that internally, but there's no way to represent it

[ephemient]

https://youtrack.jetbrains.com/issue/KT-10741

[ephemient]

union types would be pretty nice for multi-catch, https://youtrack.jetbrains.com/issue/KT-7128 - but that's another difficult design

[jojo.lichtenberger]

how do I add the implements clause in Kotlin?

[jojo.lichtenberger]

class XmlSessionDBCollection<T> (
    private val ctx: RoutingContext,
    private val dbCollection: T,
    private val user: User
) where T : TemporalNodeCollection<AbstractTemporalNode<XmlDBNode>>, T: AutoCloseable

[jojo.lichtenberger]

so, the class should implement TemporalNodeCollection<AbstractTemporalNode<XmlDBNode>> and AutoCloseable, too and most methods should be delegated to dbCollection

[jojo.lichtenberger]

Can anyone help me? Thanks 🙂

[ephemient]

class XmlSessionDBCollection<T>(
    private val dbCollection: T
) : TemporalNodeCollection by dbCollection, AutoCloseable by dbCollection
    where T : TemporalNodeCollection, T : AutoCloseable

[jojo.lichtenberger]

thanks 🙂