/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
public override object ReadJson( JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer )
{
if( typeof( DataCharacteristic ) == objectType )
{
var characteristic = new DataCharacteristic();
if( reader.Read() && reader.TokenType == JsonToken.PropertyName )
{
characteristic.Uuid = new Guid( (string)reader.Value );
var valueAttributes = new System.Collections.Generic.List<DataService.Attribute>();
if( reader.Read() && reader.TokenType == JsonToken.StartObject )
{
while( reader.Read() && reader.TokenType == JsonToken.PropertyName )
{
var key = ushort.Parse( reader.Value.ToString(), System.Globalization.CultureInfo.InvariantCulture );
var value = reader.ReadAsString();
valueAttributes.Add( new DataService.Attribute( key, value ) );
}
}
characteristic.Value = new DataValue( valueAttributes.ToArray() );
}
return characteristic;
}
else
{
var characteristics = new System.Collections.Generic.List<DataCharacteristic>();
while( reader.Read() && reader.TokenType == JsonToken.PropertyName )
{
var characteristic = new DataCharacteristic();
characteristic.Uuid = new Guid( (string) reader.Value );
var valueAttributes = new System.Collections.Generic.List<DataService.Attribute>();
if( reader.Read() && reader.TokenType == JsonToken.StartObject )
{
while( reader.Read() && reader.TokenType == JsonToken.PropertyName )
{
var key = ushort.Parse( reader.Value.ToString(), System.Globalization.CultureInfo.InvariantCulture );
var value = reader.ReadAsString();
valueAttributes.Add( new DataService.Attribute( key, value ) );
}
}
characteristic.Value = new DataValue( valueAttributes.ToArray() );
characteristics.Add( characteristic );
}
return characteristics.ToArray();
}
}
private ListViewItem CreateListViewItem( DataCharacteristic value )
{
var subItems = new[]
{
GetCharacteristicName( value.Uuid ),
value.Value != null && value.Value.MeasuredValue.HasValue ? value.Value.MeasuredValue.Value.ToString( CultureInfo.CurrentCulture ) : "-"
};
return new ListViewItem( subItems )
{
Tag = value,
ToolTipText = CreateAttributeTooltip( value.Value )
};
}
/// <summary>
/// This method fetches all measurement values of the selected measurement. The number of characteristics can be restricted using the
/// filter class. However, if all characteristics are fetched, fetching the whole measurement without a characteristic restriction
/// is best practice and the most efficient way.
/// </summary>
private async Task FetchMeasurementValues( Guid measurementUuid )
{
_MeasurementValuesListView.Items.Clear();
DataCharacteristic[] _Values = new DataCharacteristic[0];
try
{
LogMessage( "Fetching all measurement values for measurement with uuid '{0}' from data service.", measurementUuid );
var sw = System.Diagnostics.Stopwatch.StartNew();
var values = ( await _RestDataServiceClient.GetMeasurementValues( filter: new MeasurementValueFilterAttributes { MeasurementUuids = new[] { measurementUuid } } ) ).ToArray();
_Values = values != null ? values[ 0 ].Characteristics : new DataCharacteristic[ 0 ];
sw.Stop();
LogMessage( "Successfully fetched {1} measurement values from data service in {0} ms.\r\n", sw.ElapsedMilliseconds, _Values.Length );
}
catch( Exception ex )
{
LogMessage( "Error fetching measurement values for measurement with uuid '{0}' from data service: '{1}'.\r\n", measurementUuid, ex.Message );
}
_MeasurementValuesListView.BeginUpdate();
foreach( var value in _Values.OrderBy( p => GetCharacteristicName( p.Uuid ) ) )
{
_MeasurementValuesListView.Items.Add( CreateListViewItem( value ) );
}
_MeasurementValuesListView.EndUpdate();
}