public ItemValue(string itemName) : base(itemName)
{
this.m_value = null;
this.m_quality = Opc.Da.Quality.Bad;
this.m_qualitySpecified = false;
this.m_timestamp = DateTime.MinValue;
this.m_timestampSpecified = false;
}
public ItemValue(ItemIdentifier item)
{
this.m_value = null;
this.m_quality = Opc.Da.Quality.Bad;
this.m_qualitySpecified = false;
this.m_timestamp = DateTime.MinValue;
this.m_timestampSpecified = false;
if (item != null)
{
base.ItemName = item.ItemName;
base.ItemPath = item.ItemPath;
base.ClientHandle = item.ClientHandle;
base.ServerHandle = item.ServerHandle;
}
}
public ItemValue(ItemValue item) : base(item)
{
this.m_value = null;
this.m_quality = Opc.Da.Quality.Bad;
this.m_qualitySpecified = false;
this.m_timestamp = DateTime.MinValue;
this.m_timestampSpecified = false;
if (item != null)
{
this.Value = Opc.Convert.Clone(item.Value);
this.Quality = item.Quality;
this.QualitySpecified = item.QualitySpecified;
this.Timestamp = item.Timestamp;
this.TimestampSpecified = item.TimestampSpecified;
}
}
// Merge multiple timeseries. Fill with NaN.
public static Opc.Hda.ItemValueCollection[] Merge(Opc.Hda.ItemValueCollection[] OPCHDAItemValues)
{
int n_tags = OPCHDAItemValues.Count();
_trace.TraceEvent(TraceEventType.Verbose, 0, "Starting merge. n_tags = {0}", n_tags);
var MergedValues = new Opc.Hda.ItemValueCollection[n_tags];
for (int i = 0; i < n_tags; i++)
{
MergedValues[i] = new Opc.Hda.ItemValueCollection(new Opc.ItemIdentifier(OPCHDAItemValues[i]));
}
// init pointer (row numbers) for each column
int[] row = new int[n_tags];
for (int i = 0; i < n_tags; i++)
{
row[i] = 0;
}
bool ascending = true;
if (OPCHDAItemValues[0].EndTime < OPCHDAItemValues[0].StartTime)
{
ascending = false;
}
bool have_more_data = true;
while (have_more_data)
{
string msg = "rows: ";
for (int i = 0; i < n_tags; i++)
{
msg += row[i] + ", ";
}
_trace.TraceEvent(TraceEventType.Verbose, 0, msg);
// find minimum timestamp among first values of each tag (for ascending timeseries)
// find maximum timestamp among first values of each tag (for descending timeseries)
int ext_ts_col = -1;
DateTime ext_ts = System.DateTime.MaxValue;
if (ascending)
{
MinTimestamp(n_tags, row, OPCHDAItemValues, out ext_ts, out ext_ts_col);
}
else
{
MaxTimestamp(n_tags, row, OPCHDAItemValues, out ext_ts, out ext_ts_col);
}
have_more_data = false;
// copy value with this timestamp to output array
for (int i = 0; i < n_tags; i++)
{
if ((row[i] < OPCHDAItemValues[i].Count) && (OPCHDAItemValues[i][row[i]].Timestamp.Equals(ext_ts)))
{
MergedValues[i].Add(OPCHDAItemValues[i][row[i]]);
_trace.TraceEvent(TraceEventType.Verbose, 0, "Copying: {0}, {1}, {2}",
OPCHDAItemValues[i].ItemName,
OPCHDAItemValues[i][row[i]].Timestamp.ToString(),
OPCHDAItemValues[i][row[i]].Value.ToString());
row[i]++;
if (row[i] < OPCHDAItemValues[i].Count)
{
have_more_data = true;
}
}
else
{
// if there is no value for this timestamp, fill blank
var itemvalue = new Opc.Hda.ItemValue();
itemvalue.Timestamp = ext_ts;
itemvalue.Value = null;
var q = new Opc.Da.Quality();
q.QualityBits = Opc.Da.qualityBits.uncertain;
itemvalue.Quality = q;
itemvalue.HistorianQuality = Opc.Hda.Quality.NoData;
MergedValues[i].Add(itemvalue);
_trace.TraceEvent(TraceEventType.Verbose, 0, "Filling with blank: {0}, {1}",
OPCHDAItemValues[i].ItemName,
itemvalue.Timestamp.ToString());
}
}
}
return(MergedValues);
}
