Hi kotliers and a huge thanks in advance for readi...

# android

[Daniel]

Hi kotliers and a huge thanks in advance for reading my message!

Question to following case:

• Is it possible to eliminate reified in this mehod?
I want to have a method which loads a value from the firebase database and the value needs to be properly typed when returned

class OnlinePersistence { 
    suspend inline fun <reified T> loadValue(path: OnlinePersistencePath, default: T) =
            withContext(IO) {
                suspendCancellableCoroutine<T> { continuation ->
                    FirebaseDatabase
                            .getInstance()
                            .getReference(path.rawPath)
                            .addListenerForSingleValueEvent(object : ValueEventListener {
                                override fun onDataChange(snapshot: DataSnapshot) {
                                    if(continuation.isActive) {
                                        val value = snapshot.getValue<T>()

                                        if(value != null) {
                                            continuation.resume(value)
                                        } else {
                                            continuation.resume(default)
                                        }
                                    }
                                }

                                override fun onCancelled(error: DatabaseError) {
                                    if(continuation.isActive) {
                                        continuation.resume(default)
                                    }
                                }
                            })
                }
            }
}

All well and good now, but when I extract

FirebaseDatabase.getInstance()

into the constructor I cannot make it private like it should be. (Since the method is inline because of reified)

[Robert Jaros]

Instead of making an inline function with reified type parameter, you can make normal function but add third parameter of type Class. Then you will be able to pass this parameter to the getValue method: https://firebase.google.com/docs/reference/android/com/google/firebase/database/DataSnapshot#getValue(java.lang.Class%3CT%3E)

[Daniel]

Thank you, currently trying this out.
When T is List<MyClass>, then the clazz approach is at its limit, correct? since List<MyClass>::class.java is no possible

[Robert Jaros]

you can probably pass `GenericTypeIndicator`:
https://firebase.google.com/docs/reference/android/com/google/firebase/database/DataSnapshot#public-t-getvalue-generictypeindicatort-t