/// <summary>
/// Connect to Finance!Yahoo site and gets the info
/// </summary>
/// <param name="url">Finance!Yahoo URL with actual currencies as params</param>
/// <exception cref="System.UnauthorizedAccessException">Thrown when the service is unavailable</exception>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown when supplied currencies are not supported</exception>
/// <returns>List of CurrencyData objects</returns>
private List<CurrencyData> GetData(Uri url)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Proxy = _proxy;
req.Timeout = _timeout;
req.ReadWriteTimeout = _readWriteTimeout;
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
try
{
Stream respStream = resp.GetResponseStream();
try
{
StreamReader respReader = new StreamReader(respStream, Encoding.ASCII);
try
{
char[] trimchars = new char[] { '"', '\'' };
List<CurrencyData> Result = new List<CurrencyData>();
while(respReader.Peek() > 0)
{
string[] fields = respReader.ReadLine().Split(new char[] { ',' });
if((fields.Length == 0) || (fields[(int)DataFieldNames.TradeDate].Trim(trimchars).Equals(NA, StringComparison.InvariantCultureIgnoreCase)))
throw new UnauthorizedAccessException("The currency data is not available!");
if(fields[(int)DataFieldNames.CurrencyCodes].Trim(trimchars).Equals(NA, StringComparison.InvariantCultureIgnoreCase))
throw new ArgumentOutOfRangeException("These Currencies are not supported!");
string from = fields[(int)DataFieldNames.CurrencyCodes].Trim(trimchars).Substring(0, 3);
string to = fields[(int)DataFieldNames.CurrencyCodes].Trim(trimchars).Substring(3, 3);
CurrencyData data = new CurrencyData(from, to);
CultureInfo culture = new CultureInfo("en-US", false);
if(fields[(int)DataFieldNames.CurrentRate].Equals(NA, StringComparison.InvariantCultureIgnoreCase))
data.Rate = 0;
else
data.Rate = Double.Parse(fields[(int)DataFieldNames.CurrentRate], culture);
string datetime = String.Format(CultureInfo.InvariantCulture,
"{0} {1}", fields[(int)DataFieldNames.TradeDate].Trim(trimchars),
fields[(int)DataFieldNames.TradeTime].Trim(trimchars));
data.TradeDate = DateTime.Parse(datetime, culture);
if(AdjustToLocalTime)
{
DateTime utcDateTime = DateTime.SpecifyKind(data.TradeDate.AddHours(5), DateTimeKind.Utc);
data.TradeDate = utcDateTime.ToLocalTime();
if(data.TradeDate.IsDaylightSavingTime())
{
TimeSpan ts = new TimeSpan(1, 0, 0);
data.TradeDate = data.TradeDate.Subtract(ts);
}
}
try
{
if(fields[(int)DataFieldNames.MinPrice].Equals(NA, StringComparison.InvariantCultureIgnoreCase))
data.Min = 0;
else
data.Min = Double.Parse(fields[(int)DataFieldNames.MinPrice], culture);
}
catch(Exception)
{
data.Min = 0;
throw;
}
try
{
if(fields[(int)DataFieldNames.MaxPrice].Equals(NA, StringComparison.InvariantCultureIgnoreCase))
data.Max = 0;
else
data.Max = Double.Parse(fields[(int)DataFieldNames.MaxPrice], culture);
}
catch(Exception)
{
data.Max = 0;
throw;
}
Result.Add(data);
}
return Result;
}
finally
{
respReader.Close();
}
}
finally
{
respStream.Close();
}
}
finally
{
resp.Close();
}
}
/// <summary>
/// Return CurrencyData by suplied Currency codes
/// </summary>
/// <param name="source">Three-chars Currency code</param>
/// <param name="target">Three-chars Currency code</param>
/// <returns>CurrencyData class contains exchange rate information</returns>
public CurrencyData GetCurrencyData(string source, string target)
{
CurrencyData data = new CurrencyData(source, target);
GetCurrencyData(ref data);
return data;
}
/// <summary>
/// Checks CurrencyData
/// </summary>
/// <param name="data">CurrencyData object to check</param>
/// <exception cref="System.ArgumentNullException">Thrown when either BaseCode or TargetCode is empty, or BaseCode is equal to TargetCode</exception>
private void CheckParams(CurrencyData data)
{
if(data.BaseCode.Length == 0)
throw new ArgumentNullException("data.BaseCode", "Base currency code is not specified!");
if(data.TargetCode.Length == 0)
throw new ArgumentNullException("data.TargetCode", "Target currency code is not specified!");
if(data.BaseCode.Equals(data.TargetCode))
throw new ArgumentException("data.BaseCode, data.TargetCode", "Base currency code is equal to Target code!");
}
/// <summary>
/// Receive current Currency data by specified CurrencyData param
/// </summary>
/// <param name="data">Reference to a CurrencyData class containing the Currency codes</param>
/// <seealso cref="Zayko.Finance.CurrencyData"/>
public void GetCurrencyData(ref CurrencyData data)
{
CheckParams(data);
// Create the URL:
StringBuilder urlpart = new StringBuilder();
urlpart.AppendFormat(CultureInfo.InvariantCulture, paretemplate, data.BaseCode,
data.TargetCode);
List<CurrencyData> listData = GetData(new Uri(String.Format(CultureInfo.InvariantCulture, urltemplate, urlpart.ToString())));
if((listData != null) && (listData.Count > 0))
data = listData[0];
}
