/// <summary>
/// Creates a new <see cref="TagValue"/> object.
/// </summary>
/// <param name="utcSampleTime">The UTC sample time.</param>
/// <param name="numericValue">The numeric value.</param>
/// <param name="textValue">The text value.</param>
/// <param name="quality">The quality status for the value.</param>
/// <param name="units">The unit of measure for the tag value.</param>
public TagValue(DateTime utcSampleTime, double numericValue, string textValue, TagValueQuality quality, string units)
{
UtcSampleTime = utcSampleTime;
NumericValue = numericValue;
IsNumeric = !Double.IsNaN(numericValue) && !Double.IsInfinity(numericValue);
TextValue = String.IsNullOrWhiteSpace(textValue)
? numericValue.ToString(CultureInfo.InvariantCulture)
: textValue;
Quality = quality;
Units = String.IsNullOrWhiteSpace(units)
? String.Empty
: units;
}
/// <summary>
/// Converts a set of Redis <see cref="HashEntry"/> objects back into a <see cref="TagValue"/>.
/// </summary>
/// <param name="values">The Redis hash entries containing the tag value details.</param>
/// <returns>
/// The equivalent tag value.
/// </returns>
private static TagValue GetTagValueFromHashValues(HashEntry[] values)
{
DateTime utcSampleTime = DateTime.MinValue;
double numericValue = Double.NaN;
string textValue = null;
TagValueQuality quality = TagValueQuality.Uncertain;
string units = null;
foreach (var item in values)
{
switch (item.Name.ToString())
{
case "TS":
utcSampleTime = new DateTime((long)item.Value, DateTimeKind.Utc);
break;
case "N":
numericValue = (double)item.Value;
break;
case "T":
textValue = (string)item.Value;
break;
case "Q":
quality = (TagValueQuality)((int)item.Value);
break;
case "U":
units = (string)item.Value;
break;
}
}
return(new TagValue(utcSampleTime, numericValue, textValue, quality, units));
}