How to @Inject into Kotlin Builder classes with Dagger

Question

My current Android project employs a number of Kotlin data classes that employ builders to construct them.

I wish to inject an instance into the Kotlin data class.

Each of my data classes have this basic structure

data class MyDataKlass(    val onError: Consumer<in Throwable>,
                           val onComplete: Action,
                           val dbController: DatabaseController,
                           val lnController: ILoginNetworkController) : BaseSO() {

    @SuppressLint("CheckResult")
    fun execute() {

    }

}

fun myFunction(block: MyDataKlassBuilder.() -> Unit): MyDataKlass = MyDataKlassBuilder().apply(block).build()

class MyDataKlassBuilder {

    var onError: Consumer<in Throwable> = Consumer { }
    var onComplete: Action = Action { }
    lateinit var dbController: DatabaseController
    lateinit var lnController: ILoginNetworkController

    fun build(): MyDataKlass = MyDataKlass(onError, onComplete, dbController, lnController)
}

I employ these classes as follows:-

 val myFunction = myFunction {
                onComplete = Action { syncWorkerResult = Result.success() }
                dbController = databaseController
                lnController = loginNetwork
                onError = Consumer {
                    syncWorkerResult = Result.failure()
                }
            }

 myFunction.execute()

Currently I am passing in my database ( DatabaseController ) and network( ILoginNetworkController ) controllers into the Builders of the Kotlin Data classes

I wish to @Inject them to make my code "cleaner"

I can @Inject both into my Activities and Repositories but cannot see how to employ Dagger to inject them into the above Data Classes.

Is it possible to @Inject into Kotlin Data Classes?

Answer 1

I never tried this syntax on a data class, but it may be the good one:

data class MyDataKlass @Inject constructor(
    val onError: Consumer<in Throwable>,
    val onComplete: Action,
    val dbController: DatabaseController,
    val lnController: ILoginNetworkController
) : BaseSO() {
    @SuppressLint("CheckResult")
    fun execute() {
    }
}

and in your activity:

lateinit var dataKlass: MyDataKlass @Inject set

Of course, your dependency graph will have to specify how to provide all the parameters of the data class.