public CacheRow Find(string identityCode, string searchKey)
{
CacheRow cacheRow = null;
long lastRowNumber = 0;
if (binaryFiles.ContainsKey(identityCode))
{
BinaryNavigator navigator = binaryFiles[identityCode].Navigator;
navigator.MoveToFirst();
object[] row = null;
bool found = false;
while (!navigator.EOF())
{
lastRowNumber = navigator.RowNumber;
row = navigator.Read();
if (((long)row[0]).ToString() == searchKey)
{
found = true;
break;
}
}
if (found)
{
cacheRow = new CacheRow(binaryFiles[identityCode].Header.Columns, lastRowNumber, row);
}
}
return(cacheRow);
}
public static void ValidateFile(string file)
{
if (!File.Exists(file))
{
throw new Exception(string.Concat("Bar data file '", file, "' does not exist!"));
}
else
{
BinaryNavigator binaryNavigator = null;
try
{
binaryNavigator = new BinaryNavigator(file, binaryFields);
}
catch (Exception ex)
{
throw new Exception(string.Concat("Error reading data file '", file, "'!'"), ex);
}
object[] record = binaryNavigator.Read();
//time must be valid
try
{
DateTime time = new DateTime((long)record[0]);
}
catch (Exception ex)
{
throw new Exception(string.Concat("Invalid time format of data file '", file, "'!'"), ex);
}
finally
{
binaryNavigator.Close();
}
binaryNavigator.Close();
//prices must not be less than or equal to zero
//open and closing prices must be anywhere between high and low prices
if ((double)record[1] <= 0 || (double)record[2] <= 0 || (double)record[3] <= 0 || (double)record[4] <= 0 ||
(double)record[1] > (double)record[3] || (double)record[1] < (double)record[4] ||
(double)record[2] > (double)record[3] || (double)record[2] < (double)record[4])
{
throw new Exception(string.Concat("Invalid price format of data file '", file, "'!'"));
}
}
}
public CacheRow[] Select(string identityCode, long rowNumber, long rows = 1)
{
List <CacheRow> result = new List <CacheRow>();
BinaryNavigator navigator = binaryFiles[identityCode].Navigator;
if (navigator.Seek(rowNumber))
{
for (int index = 0; index < rows; index++)
{
result.Add(new CacheRow(binaryFiles[identityCode].Header.Columns, rowNumber + index, navigator.Read()));
if (navigator.EOF())
{
break;
}
}
}
return(result.Count > 0 ? result.ToArray() : null);
}
