Is there any way to use this `sealed class` to us...

# announcements

[Joan Colmenero]

Is there any way to use this sealed class to use it as a parent?

sealed class ClientName {
    data class normalClass(val name: String) : ClientName()
    object SpecificObject : ClientName()
    object AnotherObject : ClientName()
}

So now, I need to have the same objects and class but different output, so on my extension function :

That is something like this :

fun ClientName.toText(): String = when (this) {
    is ClientName.SpecificObject -> "Print1"
    is ClientName.AnotherObject -> "Print2"
    is ClientName.normalClass -> if (this.name == "") "hello" else "Bye"
}

So now I see that I'd need different types, it means that SpecificObject , AnotherObject and normalClass are goinna print different things depends of the type, so what I thought is create another sealed class like :

sealed class Type1 : ClientName()
sealed class Type2 : ClientName()

And then in that extension toText check if is Type1 then do X and if it's Type2 do Y.
But I do not know how to do it to get the same values and same clases as the ClientName what I'm missing?

[streetsofboston]

With

sealed class ClientName {
    data class normalClass(val name: String) : ClientName()
    object SpecificObject : ClientName()
    object AnotherObject : ClientName()
}

sealed class Type1 : ClientName()
sealed class Type2 : ClientName()

Then

fun ClientName.toText(): String = when (this) {
    is ClientName.SpecificObject -> "Print1"
    is ClientName.AnotherObject -> "Print2"
    is ClientName.normalClass -> if (this.name == "") "hello" else "Bye"
    is Type1 -> { X }
    is Type2 -> { Y } 
}

[Joan Colmenero]

Yes, that's exactly what I've tried but I can not use Type1.SpecificObject

[Joan Colmenero]

It says Unresolved reference SpecificObject

[streetsofboston]

? That is not possible, because SpecificObject is ‘inside’ ClientName…. And there is only one instance of it and that is ClientName.SpecificObject.
I think you may need to rethink your sealed class hierarchy

[streetsofboston]

You can’t ‘override’ SpecificObject in Type1 … it is a (static/global) singleton.

[Joan Colmenero]

What I can do is inside the new sealed classes add the same stuff that is inside of ClientName ... but I do not know if it's good to do that

[Joan Colmenero]

I mean, what I was expecting is to get these objects/class from ClientName

[tseisel]

Note that if you need a specific behavior for each subclass of a sealed class, you could also define an abstract fun in the sealed class (i.e., use polymorphism):

sealed class ClientName {
    abstract fun toText(): String

    data class NormalClass(val name: String) : ClientName() {
        override fun toText(): String = if (name.isEmpty()) "hello" else "Bye"
    }

    object SpecificObject : ClientName() {
        override fun toText(): String = "Print1"
    }
}

[Dennis]

This one goes into nesting:

https://www.youtube.com/watch?v=uGMm3StjqLI▾

[Joan Colmenero]

So I have to put all inside of a sealed class, right?

[streetsofboston]

There is no need to put it 'inside' a sealed class. Putting it 'inside' or 'outside/top-level' only affects the namespacing (ie needing it to prefix it with "ClientName.").

[Joan Colmenero]

But I was afraid because I was feeling that I'm repeating myself...

Like I have this

sealed class ClientName {
    data class normalClass(val name: String) : ClientName()
    object SpecificObject : ClientName()
    object AnotherObject : ClientName()
}
sealed class Type1 : ClientName()
sealed class Type2 : ClientName()

But then I have to put the data class normalClass.. inside of each type

[Joan Colmenero]

Right @streetsofboston?

[streetsofboston]

You could, but then you'll have 3 (one each for ClientName, Type1, Type2) separate classes. (Their namespaces are different "ClientName.normalClass", "Type1.normalClass", etc)