/// <summary>
/// Gets the cached track if available, or calculates from scratch if not available.
/// </summary>
/// <param name="activity">Activity to calculate</param>
/// <param name="chartType">Which track to calculate</param>
/// <param name="create">Cache the track if it doesn't exist.
/// True will always return a track.
/// False will return the cached track, or null if not already cached.</param>
/// <returns>Cached track if available, or empty track if not found.</returns>
private static INumericTimeDataSeries GetMeanMaxTrack(IActivity activity, Common.TrackType chartType, out INumericTimeDataSeries timeTrack, bool create)
{
if (activity == null)
{
timeTrack = new NumericTimeDataSeries();
return(new NumericTimeDataSeries());
}
string id = activity.ReferenceId + chartType;
if (tracks.ContainsKey(id))
{
// Returned cached value from memory :)
timeTrack = tracks[id + "T"];
return(tracks[id]);
}
else if (create)
{
// Not in cache, create a new mean-max track :(
INumericTimeDataSeries track = new NumericTimeDataSeries();
timeTrack = null;
switch (chartType)
{
case Common.TrackType.HR:
{
track = GetMeanMaxTrack(activity.HeartRatePerMinuteTrack, out timeTrack, activity.StartTime);
break;
}
case Common.TrackType.Power:
{
track = GetMeanMaxTrack(activity.PowerWattsTrack, out timeTrack, activity.StartTime);
break;
}
case Common.TrackType.Cadence:
{
track = GetMeanMaxTrack(activity.CadencePerMinuteTrack, out timeTrack, activity.StartTime);
break;
}
}
// Add data track and related 'T'ime track to cache for next time
MeanMaxCache.AddTrack(track, id);
MeanMaxCache.AddTrack(timeTrack, id + "T");
return(track);
}
else
{
// Not previously cached, AND requested not to create a new cached item.
timeTrack = new NumericTimeDataSeries();
return(null);
}
}
