6 magic sugars that can make your Kotlin codebase happier #18

Sugar.kt

class MediaItemRenderer: Renderer {

    override fun render(view: View, item: Item) = with(view) {
        withCorrectType<MediaItem>(item) {
            show { it.media() }
            reset()
        }
    }
}

class IconItemRenderer: Renderer {

    override fun render(view: View, item: Item) = with(view) {
        withCorrectType<IconItem>(item) {
            clear()
            show { it.icon() }
        }
    }
}

inline fun <reified T> withCorrectType(toBeChecked: Item, block: (T) -> Unit) {
    if (toBeChecked !is T) {
        throw IllegalArgumentException("Invalid type, should be ${T::class.java.simpleName}")
    }
    block.invoke(toBeChecked)
}