ProductInfoBusinessLogicCenterViewModel.kt

/**
 * Business logic center.
 */
class ProductInfoBusinessLogicCenterViewModel: ViewModel() {

    /**
     * Observable object for the view to watch.
     */
    val productInfo = MutableLiveData<ProductInfoDisplay>()

    init {
        /**
         * Creating a fake server response. Something like this would normally come back from
         * Retrofit or a repository of data.
         */
        val fakeServerResponseObject = ServerObject(ServerProductInformation("Product Name", "$1,000,000", true))

        /**
         * Business Logic that belongs in the BusinessLogicCenter
         */
        val price = if (fakeServerResponseObject.product.isOnSale) {
            "See Website"
        } else {
            fakeServerResponseObject.product.price
        }
        
        /**
         * Grabbing only what the view needs to know about from the response.
         */
        productInfo.value = ProductInfoDisplay(fakeServerResponseObject.product.productName, price)
    }
}