/// <summary>
/// Gets the result for the read operayoin.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="item">The item.</param>
/// <param name="nodeToRead">The node to read.</param>
/// <param name="value">The value.</param>
/// <param name="diagnosticsMasks">The diagnostics masks.</param>
/// <returns></returns>
public ServiceResult GetResult(
ISystemContext context,
DaItemState item,
ReadValueId nodeToRead,
DataValue value,
DiagnosticsMasks diagnosticsMasks)
{
if (nodeToRead.AttributeId == Attributes.Value)
{
ServiceResult result = GetItemValue(m_value, value, diagnosticsMasks);
if (ServiceResult.IsBad(result))
{
return(result);
}
return(ApplyIndexRangeAndDataEncoding(context, nodeToRead, value));
}
switch (nodeToRead.AttributeId)
{
case Attributes.Description:
{
string description = this.GetPropertyValue <string>(Opc.Ua.Com.PropertyIds.Description, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = new LocalizedText(description);
}
break;
}
case Attributes.DataType:
{
short datatype = this.GetPropertyValue <short>(Opc.Ua.Com.PropertyIds.DataType, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = ComUtils.GetDataTypeId(datatype);
}
break;
}
case Attributes.ValueRank:
{
short datatype = this.GetPropertyValue <short>(Opc.Ua.Com.PropertyIds.DataType, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = ComUtils.GetValueRank(datatype);
}
break;
}
case Attributes.AccessLevel:
case Attributes.UserAccessLevel:
{
int accessRights = this.GetPropertyValue <int>(Opc.Ua.Com.PropertyIds.AccessRights, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = (byte)accessRights;
}
break;
}
case Attributes.MinimumSamplingInterval:
{
float scanRate = this.GetPropertyValue <float>(Opc.Ua.Com.PropertyIds.ScanRate, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = (double)scanRate;
}
break;
}
default:
{
return(StatusCodes.BadAttributeIdInvalid);
}
}
// check if the property value is missing.
if (value.StatusCode == StatusCodes.BadNotFound)
{
return(StatusCodes.BadAttributeIdInvalid);
}
return(ApplyIndexRangeAndDataEncoding(context, nodeToRead, value));
}
/// <summary>
/// Gets the result for the read operayoin.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="item">The item.</param>
/// <param name="nodeToRead">The node to read.</param>
/// <param name="value">The value.</param>
/// <param name="diagnosticsMasks">The diagnostics masks.</param>
/// <returns></returns>
public ServiceResult GetResult(
ISystemContext context,
HdaItemState item,
ReadValueId nodeToRead,
DataValue value,
DiagnosticsMasks diagnosticsMasks)
{
switch (nodeToRead.AttributeId)
{
case Attributes.Description:
{
string description = this.GetAttributeValue <string>(Constants.OPCHDA_DESCRIPTION, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = new LocalizedText(description);
}
break;
}
case Attributes.DataType:
{
short datatype = this.GetAttributeValue <short>(Constants.OPCHDA_DATA_TYPE, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = ComUtils.GetDataTypeId(datatype);
}
else
{
value.Value = DataTypeIds.BaseDataType;
value.StatusCode = StatusCodes.GoodLocalOverride;
}
break;
}
case Attributes.ValueRank:
{
short datatype = this.GetAttributeValue <short>(Constants.OPCHDA_DATA_TYPE, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = ComUtils.GetValueRank(datatype);
}
else
{
value.Value = ValueRanks.Any;
value.StatusCode = StatusCodes.GoodLocalOverride;
}
break;
}
case Attributes.Historizing:
{
bool archiving = this.GetAttributeValue <bool>(Constants.OPCHDA_ARCHIVING, value, false);
if (StatusCode.IsGood(value.StatusCode))
{
value.Value = archiving;
}
else
{
value.Value = false;
value.StatusCode = StatusCodes.GoodLocalOverride;
}
break;
}
default:
{
return(StatusCodes.BadAttributeIdInvalid);
}
}
// check if the attribute value is missing.
if (value.StatusCode == StatusCodes.BadNotFound)
{
return(StatusCodes.BadAttributeIdInvalid);
}
return(ApplyIndexRangeAndDataEncoding(context, nodeToRead, value));
}