Opc.Ua.Server.CountAggregateCalculator.ComputeDurationInState C# (CSharp) Method

        protected DataValue ComputeDurationInState(TimeSlice slice, bool isNonZero)
        {
            // get the values in the slice.
            List<DataValue> values = GetValuesWithSimpleBounds(slice);

            // check for empty slice.
            if (values == null)
            {
                return GetNoDataValue(slice);
            }

            // get the regions.
            List<SubRegion> regions = GetRegionsInValueSet(values, false, true);

            double duration = 0;

            for (int ii = 0; ii < regions.Count; ii++)
            {
                if (StatusCode.IsNotGood(regions[ii].StatusCode))
                {
                    continue;
                }

                if (isNonZero)
                {
                    if (regions[ii].StartValue != 0)
                    {
                        duration += regions[ii].Duration;
                    }
                }
                else
                {
                    if (regions[ii].StartValue == 0)
                    {
                        duration += regions[ii].Duration;
                    }
                }
            }

            // set the timestamp and status.
            DataValue value = new DataValue();
            value.WrappedValue = new Variant(duration, TypeInfo.Scalars.Double);
            value.SourceTimestamp = GetTimestamp(slice);
            value.ServerTimestamp = GetTimestamp(slice);
            value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);
            value.StatusCode = GetTimeBasedStatusCode(regions, value.StatusCode);

            // return result.
            return value;
        }