NestedFilterViewAdapterWrapper.kt

class NestedFilterViewAdapterWrapper {

    private val mainAdapter = ConcatAdapter()

    fun getMainAdapter() = mainAdapter

    fun refreshAdapters() = getMainAdapter().adapters.map { it.notifyDataSetChanged() }

    fun swapAdapter() = getMainAdapter().removeAllAdapters()

    fun addAdapterAt(position: Int, adapter: Adapter<out ViewHolder>) = getMainAdapter().addAdapter(position, adapter)

    fun addAdapter(adapter: Adapter<out ViewHolder>) = getMainAdapter().addAdapter(adapter)
}

private fun ConcatAdapter.removeAllAdapters() {
    val listOfAdapters = this.adapters
    listOfAdapters.forEach { adapter ->
        this.removeAdapter(adapter)
    }
}