Is there a way to access an instance variable from...

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[Ellen Spertus]

Is there a way to access an instance variable from an inner class of a sealed class? Here’s a code excerpt:

class NearbyConnection{

    var connectionsClient: ConnectionsClient = Nearby.getConnectionsClient(context)
    
    public sealed class ConnectionState(val name: String) {
        inner class Authenticating: ConnectionState("authenticating") {
            fun accept() {
                connectionsClient.acceptConnection(neighborId, payloadCallback)
                updateState(ConnectionState.Connecting(neighborId, neighborName))
            }
        }

I am getting the error “unresolved reference connectionsClient” within the function.

[karelpeeters]

Your sealed class should be inner too.

[Ellen Spertus]

I get the error: Modifier 'inner' is incompatible with 'sealed'.

[karelpeeters]

That's strange, why would that be? Then I'm afraid you're stuck, but it's not that difficult to write out the "inner" boilerplate yourself, just add a parameter for the outer class instance.

[Ellen Spertus]

True, I’ll have to think about whether it’s worth it. (I only want the method to be callable when the connection is in the Authenticating state.)

[Ellen Spertus]

Thank you @karelpeeters

[karelpeeters]

Ah it's because sealed classes can only be top level for the "subclass must be in the same file" rule: https://discuss.kotlinlang.org/t/sealed-inner-classes/2371

[Kirill Zhukov]

I’d pass ConnectionsClient instance through API (accept function in your case) instead of relying on inner state

[Ellen Spertus]

@Kirill Zhukov The ConnectionState gets passed to a client who should not need to know about the ConnectionsClient.