Repository which provides the latest currency exchange rates for every country. The USD is the base currency

ExchangeRateRepository.kt

package com.changui.penguinpay

import android.content.Context
import android.net.ConnectivityManager


interface ExchangeRateRepoInt {
    suspend fun getExchangeRates(): ExchangeRates?
}

interface NetworkAccessInt {
    fun isConnectedToInternet(): Boolean
}

class NetworkAccessImpl(private val context: Context): NetworkAccessInt {
    override fun isConnectedToInternet(): Boolean {
        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val activeNetwork = cm.activeNetworkInfo
        return activeNetwork != null &&
                activeNetwork.isConnectedOrConnecting
    }
}

class ExchangeRateRepoImpl(private val api: RateExchangeApi, private val networkAccessInt: NetworkAccessInt): ExchangeRateRepoInt {
    override suspend fun getExchangeRates(): ExchangeRates {
        if (networkAccessInt.isConnectedToInternet()) {
            val response = api.getLatestRates()
            return response?.rates ?: throw NoDataException()
        } else throw InternetErrorException()
    }

}

class NoDataException : Exception()
class InternetErrorException : Exception()