Repository Pattern Repository getProducts

ProductRepositoryImpl.kt

class ProductRepositoryImpl(
    private val productApiService: ProductApiService,
    private val productDataMapper: Mapper<DataProduct, Product>,
    private val productPreferences: ProductPreferences
) : ProductRepository {

    override fun getProducts(): Single<Result<List<Product>>> {
        return productApiService.getProducts().map {
            when(it) {
                is Result.Success -> Result.Success(mapProducts(it.value))
                is Result.Failure -> Result.Failure<List<Product>>(it.throwable)
            }
        }
    }

    private fun mapProducts(networkProductList: List<NetworkProduct>): List<Product> {
        return networkProductList.map { 
            productDataMapper.map(DataProduct(it, productPreferences.isFavourite(it.id)))
        }
    }
      
}