/// <summary>
/// Queries multiple signal buffers to build a list of frames of data over the given sample window.
/// </summary>
/// <param name="keys">The keys that identify the signals to be queried.</param>
/// <param name="frameTime">The time of the frame relative to which the sample window is defined.</param>
/// <param name="window">The sample window that defines the range of time to be queried from the buffer.</param>
/// <param name="resamplingStrategy">The strategy to use for alignment of data to the sample rate of the window.</param>
/// <returns>A collection of frames over the given sample window.</returns>
public List <IDictionary <MeasurementKey, IMeasurement> > GetFrames(MeasurementKey[] keys, Ticks frameTime, SampleWindow window, ResamplingStrategy resamplingStrategy)
{
List <IDictionary <MeasurementKey, IMeasurement> > frames = new List <IDictionary <MeasurementKey, IMeasurement> >();
SignalBuffer signalBuffer;
foreach (MeasurementKey key in keys)
{
if (!m_signalBuffers.TryGetValue(key, out signalBuffer))
{
continue;
}
List <IMeasurement> measurements = GetMeasurements(key, frameTime, window, resamplingStrategy);
while (frames.Count < measurements.Count)
{
frames.Add(keys.ToDictionary(k => k, k => (IMeasurement)null));
}
for (int i = 0; i < measurements.Count; i++)
{
frames[i][key] = measurements[i];
}
}
return(frames);
}
/// <summary>
/// Queries a signal buffer for the full collection of measurements over the given sample window.
/// </summary>
/// <param name="key">The key that identifies the signal to be queried.</param>
/// <param name="frameTime">The time of the frame relative to which the sample window is defined.</param>
/// <param name="window">The sample window that defines the range of time to be queried from the buffer.</param>
/// <param name="resamplingStrategy">The strategy to use for alignment of data to the sample rate of the window.</param>
/// <returns>The full collection of measurements for the given signal in the given sample window relative to the given frame time.</returns>
public List <IMeasurement> GetMeasurements(MeasurementKey key, Ticks frameTime, SampleWindow window, ResamplingStrategy resamplingStrategy)
{
SignalBuffer signalBuffer;
if (!m_signalBuffers.TryGetValue(key, out signalBuffer))
{
return(null);
}
switch (resamplingStrategy)
{
default:
case ResamplingStrategy.NearestMeasurement:
return(window.AlignNearest(signalBuffer, frameTime));
case ResamplingStrategy.FillMissingData:
return(window.AlignFill(signalBuffer, frameTime));
case ResamplingStrategy.None:
return(window.AlignNone(signalBuffer, frameTime));
}
}
