Samuele Locatelli
371 lines
12 KiB
C#
371 lines
12 KiB
C#
/* ========================================================================
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* Copyright (c) 2005-2020 The OPC Foundation, Inc. All rights reserved.
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*
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* OPC Foundation MIT License 1.00
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* The complete license agreement can be found here:
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* http://opcfoundation.org/License/MIT/1.00/
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* ======================================================================*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Opc.Ua.Server
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{
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/// <summary>
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/// Calculates the value of an aggregate.
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/// </summary>
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public class StartEndAggregateCalculator : AggregateCalculator
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{
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#region Constructors
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/// <summary>
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/// Initializes the aggregate calculator.
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/// </summary>
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/// <param name="aggregateId">The aggregate function to apply.</param>
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/// <param name="startTime">The start time.</param>
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/// <param name="endTime">The end time.</param>
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/// <param name="processingInterval">The processing interval.</param>
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/// <param name="stepped">Whether to use stepped interpolation.</param>
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/// <param name="configuration">The aggregate configuration.</param>
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public StartEndAggregateCalculator(
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NodeId aggregateId,
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DateTime startTime,
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DateTime endTime,
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double processingInterval,
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bool stepped,
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AggregateConfiguration configuration)
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:
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base(aggregateId, startTime, endTime, processingInterval, stepped, configuration)
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{
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SetPartialBit = true;
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}
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#endregion
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#region Overridden Methods
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/// <summary>
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/// Computes the value for the timeslice.
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/// </summary>
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protected override DataValue ComputeValue(TimeSlice slice)
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{
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uint? id = AggregateId.Identifier as uint?;
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if (id != null)
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{
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switch (id.Value)
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{
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case Objects.AggregateFunction_Start:
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{
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return ComputeStartEnd(slice, false);
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}
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case Objects.AggregateFunction_End:
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{
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return ComputeStartEnd(slice, true);
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}
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case Objects.AggregateFunction_Delta:
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{
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return ComputeDelta(slice);
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}
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case Objects.AggregateFunction_StartBound:
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{
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return ComputeStartEnd2(slice, false);
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}
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case Objects.AggregateFunction_EndBound:
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{
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return ComputeStartEnd2(slice, true);
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}
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case Objects.AggregateFunction_DeltaBounds:
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{
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return ComputeDelta2(slice);
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}
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}
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}
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return base.ComputeValue(slice);
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}
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#endregion
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#region Protected Methods
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/// <summary>
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/// Calculate the Start and End aggregates for the timeslice.
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/// </summary>
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protected DataValue ComputeStartEnd(TimeSlice slice, bool returnEnd)
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{
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// get the values in the slice.
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List<DataValue> values = GetValues(slice);
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// check for empty slice.
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if (values == null || values.Count == 0)
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{
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return GetNoDataValue(slice);
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}
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// return start value.
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if (!returnEnd)
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{
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return values[0];
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}
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// return end value.
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else
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{
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return values[values.Count - 1];
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}
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}
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/// <summary>
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/// Calculates the Delta aggregate for the timeslice.
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/// </summary>
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protected DataValue ComputeDelta(TimeSlice slice)
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{
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// get the values in the slice.
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List<DataValue> values = GetValues(slice);
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// check for empty slice.
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if (values == null || values.Count == 0)
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{
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return GetNoDataValue(slice);
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}
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// find start value.
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DataValue start = null;
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double startValue = 0;
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TypeInfo originalType = null;
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bool badDataSkipped = false;
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for (int ii = 0; ii < values.Count; ii++)
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{
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start = values[ii];
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if (StatusCode.IsGood(start.StatusCode))
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{
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try
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{
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startValue = CastToDouble(start);
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originalType = start.WrappedValue.TypeInfo;
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break;
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}
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catch (Exception)
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{
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startValue = Double.NaN;
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}
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}
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start = null;
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badDataSkipped = true;
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}
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// find end value.
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DataValue end = null;
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double endValue = 0;
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for (int ii = values.Count - 1; ii >= 0; ii--)
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{
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end = values[ii];
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if (StatusCode.IsGood(end.StatusCode))
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{
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try
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{
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endValue = CastToDouble(end);
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break;
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}
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catch (Exception)
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{
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endValue = Double.NaN;
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}
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break;
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}
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end = null;
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badDataSkipped = true;
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}
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// check if no good data.
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if (Double.IsNaN(startValue) || Double.IsNaN(endValue))
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{
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return GetNoDataValue(slice);
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}
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DataValue value = new DataValue();
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value.SourceTimestamp = GetTimestamp(slice);
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value.ServerTimestamp = GetTimestamp(slice);
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// set status code.
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if (badDataSkipped)
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{
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value.StatusCode = StatusCodes.UncertainDataSubNormal;
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}
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value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);
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// calculate delta.
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double delta = endValue - startValue;
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if (originalType != null && originalType.BuiltInType != BuiltInType.Double)
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{
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object delta2 = TypeInfo.Cast(delta, TypeInfo.Scalars.Double, originalType.BuiltInType);
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value.WrappedValue = new Variant(delta2, originalType);
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}
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else
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{
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value.WrappedValue = new Variant(delta, TypeInfo.Scalars.Double);
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}
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// return result.
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return value;
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}
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/// <summary>
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/// Calculate the Start2 and End2 aggregates for the timeslice.
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/// </summary>
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protected DataValue ComputeStartEnd2(TimeSlice slice, bool returnEnd)
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{
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// get the values in the slice.
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List<DataValue> values = GetValuesWithSimpleBounds(slice);
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// check for empty slice.
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if (values == null || values.Count == 0)
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{
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return GetNoDataValue(slice);
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}
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DataValue value = null;
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// return start bound.
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if ((!returnEnd && !TimeFlowsBackward) || (returnEnd && TimeFlowsBackward))
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{
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value = values[0];
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}
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// return end bound.
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else
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{
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value = values[values.Count - 1];
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}
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if (returnEnd)
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{
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value.SourceTimestamp = GetTimestamp(slice);
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value.ServerTimestamp = GetTimestamp(slice);
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if (StatusCode.IsNotBad(value.StatusCode))
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{
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value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);
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}
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}
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return value;
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}
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/// <summary>
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/// Calculates the Delta2 aggregate for the timeslice.
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/// </summary>
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protected DataValue ComputeDelta2(TimeSlice slice)
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{
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// get the values in the slice.
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List<DataValue> values = GetValuesWithSimpleBounds(slice);
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// check for empty slice.
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if (values == null || values.Count == 0)
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{
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return GetNoDataValue(slice);
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}
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DataValue start = values[0];
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DataValue end = values[values.Count-1];
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// check for bad bounds.
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if (StatusCode.IsBad(start.StatusCode) || StatusCode.IsBad(end.StatusCode))
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{
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return GetNoDataValue(slice);
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}
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// convert to doubles.
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double startValue = 0;
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TypeInfo originalType = null;
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try
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{
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startValue = CastToDouble(start);
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originalType = start.WrappedValue.TypeInfo;
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}
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catch (Exception)
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{
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startValue = Double.NaN;
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}
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double endValue = 0;
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try
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{
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endValue = CastToDouble(end);
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}
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catch (Exception)
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{
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endValue = Double.NaN;
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}
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// check for bad bounds.
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if (Double.IsNaN(startValue) || Double.IsNaN(endValue))
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{
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return GetNoDataValue(slice);
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}
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DataValue value = new DataValue();
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value.SourceTimestamp = GetTimestamp(slice);
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value.ServerTimestamp = GetTimestamp(slice);
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if (StatusCode.IsNotGood(start.StatusCode) || StatusCode.IsNotGood(end.StatusCode))
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{
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value.StatusCode = StatusCodes.UncertainDataSubNormal;
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}
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value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);
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// calculate delta.
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double delta = endValue - startValue;
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if (originalType != null && originalType.BuiltInType != BuiltInType.Double)
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{
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object delta2 = TypeInfo.Cast(delta, TypeInfo.Scalars.Double, originalType.BuiltInType);
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value.WrappedValue = new Variant(delta2, originalType);
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}
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else
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{
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value.WrappedValue = new Variant(delta, TypeInfo.Scalars.Double);
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}
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// return result.
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return value;
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}
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#endregion
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}
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}
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