private byte[] FindBlockHA(DateTime dateTime, RecordCollection cache)
{
byte[] result = null;
while (true)
{
Record nearest = cache.GetNearestRecordHA(dateTime);
int steps = CalculateStepsHA(dateTime, nearest);
Address newAddress = nearest.Address.GetNextAddressHA(steps);
Record newRecord = ReadRecord(newAddress);
if (newRecord == null || DriverHelper.IsValidRecord(newRecord) == false)
{
break;
}
if (DriverHelper.IsValidRecord(newRecord))
{
cache.Add(newRecord);
}
if (newRecord.Block1.DateTime == dateTime)
{
result = newRecord.Block1.Bytes;
break;
}
if (newRecord.Block2.DateTime == dateTime)
{
result = newRecord.Block2.Bytes;
break;
}
if (cache.IsRecordExist(dateTime))
{
var record = cache.ExistRecord(dateTime);
if (dateTime == record.Block1.DateTime)
{
result = newRecord.Block1.Bytes;
break;
}
if (dateTime == record.Block2.DateTime)
{
result = newRecord.Block2.Bytes;
break;
}
break;
}
}
return(result);
}
public override SurveyResultData ReadHourlyArchive(IEnumerable <DateTime> dates)
{
var result = new List <Data>();
var cache = new RecordCollection();
if (!Connect())
{
return(null);
}
var firstRecord = ReadRecord(Address.GetFirstHourAddress());
if (firstRecord != null)
{
cache.Add(firstRecord);
}
var presentRecord = FindPresentRecordHA(firstRecord);
if (presentRecord != null)
{
cache.Add(presentRecord);
}
foreach (var dateTime in dates)
{
var records = ParseHA((FindBlockHA(dateTime, cache)), dateTime);
if (records != null)
{
result.AddRange(records);
}
}
return(new SurveyResultData
{
Records = result,
State = result.Any() ? SurveyResultState.Success : SurveyResultState.PartialyRead
});
}