Struct opcua_server::prelude::data_value::DataValue

pub struct DataValue {
    pub value: Option<Variant>,
    pub status: Option<u32>,
    pub source_timestamp: Option<DateTime>,
    pub source_picoseconds: Option<i16>,
    pub server_timestamp: Option<DateTime>,
    pub server_picoseconds: Option<i16>,
}

A data value is a value of a variable in the OPC UA server and contains information about its value, status and change timestamps.

Fields

value: Option<Variant>

The value. BaseDataType Not present if the Value bit in the EncodingMask is False.

status: Option<u32>

The status associated with the value. Not present if the StatusCode bit in the EncodingMask is False Note we don't use StatusCode enum because extra bits can be set on the value

source_timestamp: Option<DateTime>

The source timestamp associated with the value. Not present if the SourceTimestamp bit in the EncodingMask is False.

source_picoseconds: Option<i16>

The number of 10 picosecond intervals for the SourceTimestamp. Not present if the SourcePicoSeconds bit in the EncodingMask is False. If the source timestamp is missing the picoseconds are ignored.

server_timestamp: Option<DateTime>

The Server timestamp associated with the value. Not present if the ServerTimestamp bit in the EncodingMask is False.

server_picoseconds: Option<i16>

The number of 10 picosecond intervals for the ServerTimestamp. Not present if the ServerPicoSeconds bit in the EncodingMask is False. If the Server timestamp is missing the picoseconds are ignored.

Methods

impl DataValue

pub fn new<V>(value: V) -> DataValue where
    V: Into<Variant>, 

Creates a data value from the supplied value

pub fn null() -> DataValue

Creates an empty DataValue

pub fn set_value<V>(
    &mut self,
    value: V,
    source_timestamp: &DateTime,
    server_timestamp: &DateTime
) where
    V: Into<Variant>, 

Sets the value of the data value, updating the timestamps at the same point

pub fn status(&self) -> u32

Returns the status code as a u32

pub fn is_valid(&self) -> bool

Test if the value held by this data value is known to be good Anything other than Good is assumed to be invalid.

Trait Implementations

impl BinaryEncoder<DataValue> for DataValue

fn byte_len(&self) -> usize

Returns the byte length of the structure. This calculation should be exact and as efficient as possible.

fn encode<S>(&self, stream: &mut S) -> Result<usize, StatusCode> where
    S: Write, 

Encodes the instance to the write stream.

fn decode<S>(
    stream: &mut S,
    decoding_limits: &DecodingLimits
) -> Result<DataValue, StatusCode> where
    S: Read, 

Decodes an instance from the read stream. The decoding limits are restrictions set by the server / client on the length of strings, arrays etc. If these limits are exceeded the implementation should return with a BadDecodingError as soon as possible.

fn to_vec(&self) -> Vec<u8>

impl Clone for DataValue

fn clone(&self) -> DataValue

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Serialize for DataValue

fn serialize<__S>(
    &self,
    __serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl From<DataValue> for Variant

fn from(v: DataValue) -> Variant

Performs the conversion.

impl From<Variant> for DataValue

fn from(v: Variant) -> DataValue

Performs the conversion.

impl<'a> From<(Variant, &'a DateTime)> for DataValue

fn from(v: (Variant, &'a DateTime)) -> DataValue

Performs the conversion.

impl<'a> From<(Variant, &'a DateTime, &'a DateTime)> for DataValue

fn from(v: (Variant, &'a DateTime, &'a DateTime)) -> DataValue

Performs the conversion.

impl PartialEq<DataValue> for DataValue

fn eq(&self, other: &DataValue) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &DataValue) -> bool

This method tests for !=.

impl<'de> Deserialize<'de> for DataValue

fn deserialize<__D>(
    __deserializer: __D
) -> Result<DataValue, <__D as Deserializer<'de>>::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Debug for DataValue

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.