SymbolData GetSymbolDataOffline(string symbol)
{
SymbolData data = null;
try
{
using (var zstream = GetResourceStream(symbol + ".csv.zip"))
{
if (zstream != null)
{
using (var zip = new C1ZipFile(zstream))
{
using (var stream = zip.Entries[0].OpenReader())
{
using (var sr = new StreamReader(stream))
{
data = LoadQuote(sr.ReadToEnd());
}
}
}
}
}
}
catch
{
}
return(data);
}
void CacheQuote(string symbol, SymbolData quote)
{
try
{
if (!Directory.Exists(CACHE_DIR))
{
Directory.CreateDirectory(CACHE_DIR);
}
var fi = new FileInfo(GetCacheFileName(symbol));
using (var sw = fi.CreateText())
{
for (var i = quote.Count - 1; i >= 0; i--)
{
var q = quote[i];
sw.WriteLine(string.Format("{0},{1},{2},{3},{4},{5}",
q.Date.ToString("yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture),
q.Open, q.High, q.Low, q.Close, q.Volume));
}
}
}
catch
{
}
}
void GetSymbolDataOnlineAsync(string symbol, Action <string, SymbolData> action)
{
SymbolData data = null;
using (var wc = new WebClient())
{
wc.DownloadStringCompleted += (s, e) =>
{
if (e.Error == null)
{
try
{
data = LoadQuote(e.Result);
}
catch
{
data = null;
}
}
else
{
Online = false;
}
if (data == null)
{
data = GetSymbolDataOffline(symbol);
}
else
{
CacheQuote(symbol, data);
}
action(symbol, data);
};
try
{
wc.DownloadStringAsync(new Uri(string.Format(SERVICE_URL, symbol)));
}
catch
{
Online = false;
data = GetSymbolDataOffline(symbol);
action(symbol, data);
}
}
}
public void GetSymbolDataAsync(string symbol, Action <string, SymbolData> action, bool loadEvents = true)
{
SymbolData data = null;
// try app cache
if (_quotes.TryGetValue(symbol, out data))
{
action(symbol, data);
}
else
{
// try file cache
data = GetSymbolDataCache(symbol);
if (data != null)
{
action(symbol, data);
}
else
{
if (Online)
{
GetSymbolDataOnlineAsync(symbol, (s, d) =>
{
action(s, d);
if (loadEvents)
{
LoadEvents(s, d);
}
});
}
else
{
data = GetSymbolDataOffline(symbol);
action(symbol, data);
}
}
}
if (loadEvents)
{
LoadEvents(symbol, data);
}
}
SymbolData GetSymbolDataCache(string symbol)
{
SymbolData data = null;
try
{
var fi = new FileInfo(GetCacheFileName(symbol));
if (fi.Exists && (DateTime.Today - fi.LastWriteTime).Days <= 1)
{
using (var sr = fi.OpenText())
{
data = LoadQuote(sr.ReadToEnd());
}
}
}
catch
{
}
return(data);
}
SymbolData LoadQuote(string s, bool skipHeader = true)
{
var data = new SymbolData();
var ss = s.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
for (var i = skipHeader ? 1 : 0; i < ss.Length; i++)
{
var q = new Quote(data);
q.Read(ss[i]);
if (q.Date.Year >= YEAR0)
{
data.Add(q);
}
}
if (data != null && data.Count > 1 && data[0].Date > data[data.Count - 1].Date)
{
data.Reverse();
}
return(data);
}
void LoadEvents(string symbol, SymbolData data)
{
if (data == null || data.Count == 0)
{
return;
}
var url = string.Format(NEWS_URL, symbol);
using (var wc = new WebClient())
{
wc.DownloadStringCompleted += (s, e) =>
{
if (e.Error == null)
{
try
{
var doc = new XmlDocument();
doc.LoadXml(e.Result);
var items = doc.GetElementsByTagName("item");
// read each line
foreach (XmlNode item in items)
{
var dt = DateTime.Parse(item["pubDate"].InnerText);
var text = item["title"].InnerText;
var quote = data.FirstOrDefault(q => (q.Date - dt).Days == 0);
if (quote != null)
{
if (quote.Events != null)
{
if (quote.Events.Length > 0)
{
quote.Events += Environment.NewLine;
}
quote.Events += text;
}
else
{
quote.Events = text;
}
}
}
OnNewsLoaded();
}
catch
{
}
}
};
try
{
wc.DownloadStringAsync(new Uri(url));
}
catch
{
}
}
}
public Quote(SymbolData parent)
{
_parent = parent;
}