//TODO refactor to Dictionary ?
public IExchangeCase GetExchangeCase(CurrencyRate currencyFrom, CurrencyRate currencyTo, CurrencyRate baseCurrency)
{
if (currencyFrom.Equals(currencyTo))
{
return(new CurrencyFromCurrencyToTheSameCase(currencyFrom, currencyTo));
}
if (currencyFrom.Equals(baseCurrency))
{
return(new CurrencyFromIsBaseCurrencyCase(currencyFrom, currencyTo));
}
if (currencyTo.Equals(baseCurrency))
{
return(new CurrencyToIsBaseCurrencyCase(currencyFrom, currencyTo));
}
return(new CurrencyFromAndCurrencyToAreNotBaseCase(currencyFrom, currencyTo));
}