Opc.Ua.Com.Server.ComHdaProxy.GetAttributeValue C# (CSharp) Method

        internal static DaValue GetAttributeValue(Session session, ComNamespaceMapper mapper, uint attributeId, DataValue value)
        {
            switch (attributeId)
            {
                case INTERNAL_ATTRIBUTE_ANNOTATION:
                {
                    DaValue result = new DaValue();

                    Annotation annotation = value.GetValue<Annotation>(null);

                    if (annotation == null)
                    {
                        result.Error = ResultIds.E_BADTYPE;
                        return result;
                    }

                    result.Value = annotation;
                    result.HdaQuality = ComUtils.GetHdaQualityCode(value.StatusCode);
                    result.Timestamp = value.SourceTimestamp;
                    result.Error = ResultIds.S_OK;

                    return result;
                }

                case Constants.OPCHDA_ENG_UNITS:
                {
                    DaValue result = new DaValue();

                    EUInformation engineeringUnits = value.GetValue<EUInformation>(null);

                    if (engineeringUnits == null)
                    {
                        result.Error = ResultIds.E_INVALIDATTRID;
                        return result;
                    }

                    if (engineeringUnits.DisplayName != null)
                    {
                        result.Value = engineeringUnits.DisplayName.Text;
                    }

                    result.HdaQuality = ComUtils.GetHdaQualityCode(value.StatusCode);
                    result.Timestamp = value.SourceTimestamp;
                    result.Error = ResultIds.S_OK;

                    return result;
                }

                case Constants.OPCHDA_HIGH_ENTRY_LIMIT:
                case Constants.OPCHDA_NORMAL_MAXIMUM:
                {
                    DaValue result = new DaValue();

                    Range range = value.GetValue<Range>(null);

                    if (range == null)
                    {
                        result.Error = ResultIds.E_INVALIDATTRID;
                        return result;
                    }

                    result.Value = range.High;
                    result.HdaQuality = ComUtils.GetHdaQualityCode(value.StatusCode);
                    result.Timestamp = value.SourceTimestamp;
                    result.Error = ResultIds.S_OK;

                    return result;
                }

                case Constants.OPCHDA_LOW_ENTRY_LIMIT:
                case Constants.OPCHDA_NORMAL_MINIMUM:
                {
                    DaValue result = new DaValue();

                    Range range = value.GetValue<Range>(null);

                    if (range == null)
                    {
                        result.Error = ResultIds.E_INVALIDATTRID;
                        return result;
                    }

                    result.Value = range.Low;
                    result.HdaQuality = ComUtils.GetHdaQualityCode(value.StatusCode);
                    result.Timestamp = value.SourceTimestamp;
                    result.Error = ResultIds.S_OK;

                    return result;
                }

                case Constants.OPCHDA_MAX_TIME_INT:
                case Constants.OPCHDA_MIN_TIME_INT:
                {
                    DaValue result = new DaValue();

                    int error = ComHdaProxy.MapReadStatusToErrorCode(value.StatusCode);

                    if (error < 0)
                    {
                        result.Error = error;
                        return result;
                    }

                    // need to support the VT_CY type.
                    result.Value = (decimal)value.GetValue<double>(0);
                    result.HdaQuality = ComUtils.GetHdaQualityCode(value.StatusCode);
                    result.Timestamp = value.SourceTimestamp;
                    result.Error = ResultIds.S_OK;

                    return result;
                }

                default:
                case Constants.OPCHDA_ITEMID:
                case Constants.OPCHDA_ARCHIVING:
                case Constants.OPCHDA_STEPPED:
                case Constants.OPCHDA_EXCEPTION_DEV:
                case Constants.OPCHDA_EXCEPTION_DEV_TYPE:
                case Constants.OPCHDA_DERIVE_EQUATION:
                {
                    return mapper.GetLocalDataValue(value);
                }
            }
        }