/// <summary>
/// Create a new Chain to be able to change specified currencies
/// </summary>
/// <param name="initialCurrency">Initial currency to change</param>
/// <param name="targetCurrency">Target currency to change</param>
/// <returns>Chain builded if it exist, else null</returns>
/// <remarks>Strategy to determine is:<Br/>
/// First try to get a ExchangeRate without intermediary change<Br/>
/// If it's not possible, then build all available chain and keep the fastest path<Br/>
/// If no way null is returned.
/// </remarks>
public IExchangeChain Create(string initialCurrency, string targetCurrency)
{
if (string.IsNullOrEmpty(initialCurrency))
{
throw new ArgumentNullException("initialCurrency");
}
if (string.IsNullOrEmpty(targetCurrency))
{
throw new ArgumentNullException("targetCurrency");
}
var directExchange = GetFirstOrDefaultDirectExchange(initialCurrency, targetCurrency);
if (directExchange != null)
{
return(DirectExchange.Create(directExchange, initialCurrency, targetCurrency));
}
return(GetFastestChain(initialCurrency, targetCurrency));
}
