public WindSpeedBin[] Create(StationObservations stationObservations, NormalizeWindSpeedStrategy normalizeWindSpeedStrategy)
{
var stationIdentifier = stationObservations.Station.Identifier;
if (!stationObservations.Observations.Any())
{
return(new WindSpeedBin[0]);
}
var grps = stationObservations.Observations
.GroupBy(x => new DateTime(x.Timestamp.Year, x.Timestamp.Month, x.Timestamp.Day, x.Timestamp.Hour, 0, 0, DateTimeKind.Utc));
var date = grps.Min(x => x.Key);
var maxDate = grps.Max(x => x.Key);
var bins = new List <WindSpeedBin>();
while (date <= maxDate)
{
double?normalizedWindSpeed;
var grp = grps.SingleOrDefault(x => x.Key == date);
if (grp == null)
{
normalizedWindSpeed = null;
}
else
{
var strategy = GetStrategyFunc(normalizeWindSpeedStrategy);
normalizedWindSpeed = strategy(grp);
}
var bin = new WindSpeedBin(stationIdentifier, date, normalizedWindSpeed);
bins.Add(bin);
date = date.AddHours(1);
}
return(bins.ToArray());
}
private static Func <IGrouping <DateTime, Observation>, double?> GetStrategyFunc(NormalizeWindSpeedStrategy strategy)
{
switch (strategy)
{
case NormalizeWindSpeedStrategy.MaxWindSpeed:
return(x => x.Max(y => y.WindSpeed));
case NormalizeWindSpeedStrategy.AverageWindSpeed:
return(x => x.Average(y => y.WindSpeed));
default:
throw new ArgumentOutOfRangeException(strategy.ToString());
}
}