Struct icu_provider_adapters::fixed::FixedProvider

pub struct FixedProvider<M: DataMarker> { /* private fields */ }

A data provider that returns clones of a fixed type-erased payload.

FixedProvider implements [AnyProvider], so it can be used in *_with_any_provider constructors across ICU4X.

Examples

use icu_provider::hello_world::*;
use icu_provider::prelude::*;
use icu_provider_adapters::fixed::FixedProvider;
use std::borrow::Cow;
use writeable::assert_writeable_eq;

let provider =
    FixedProvider::<HelloWorldV1Marker>::from_static(&HelloWorldV1 {
        message: Cow::Borrowed("custom hello world"),
    });

// Check that it works:
let formatter = HelloWorldFormatter::try_new_with_any_provider(
    &provider,
    Default::default(),
)
.expect("marker matches");
assert_writeable_eq!(formatter.format(), "custom hello world");

// Requests for invalid markers get MissingDataMarker
assert!(matches!(
    provider.load_any(DummyMarker::INFO, Default::default()),
    Err(DataError {
        kind: DataErrorKind::MarkerNotFound,
        ..
    })
))

Implementations

impl<M: DataMarker> FixedProvider<M>

pub fn from_owned(data: M::DataStruct) -> Self

Creates a FixedProvider with an owned (allocated) payload of the given data.

pub fn from_static(data: &'static M::DataStruct) -> Self

Creates a FixedProvider with a statically borrowed payload of the given data.

pub fn from_payload(data: DataPayload<M>) -> Self

Creates a FixedProvider from an existing [DataPayload].

pub fn new_default() -> Self

where M::DataStruct: Default,

Creates a FixedProvider with the default (allocated) version of the data struct.

Trait Implementations

impl<M: DataMarker> AnyProvider for FixedProvider<M>

where for<'a> YokeTraitHack<<M::DataStruct as Yokeable<'a>>::Output>: Clone, M::DataStruct: MaybeSendSync,

fn load_any( &self, marker: DataMarkerInfo, _: DataRequest<'_>, ) -> Result<AnyResponse, DataError>

Loads an [AnyPayload] according to the marker and request.

impl<M> DataProvider<M> for FixedProvider<M>

where M: DataMarker, for<'a> YokeTraitHack<<M::DataStruct as Yokeable<'a>>::Output>: Clone,

fn load(&self, _: DataRequest<'_>) -> Result<DataResponse<M>, DataError>

Query the provider for data, returning the result.

impl<M> Debug for FixedProvider<M>

where M: DynamicDataMarker + DataMarker, for<'a> &'a <M::DataStruct as Yokeable<'a>>::Output: Debug,

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

Formats the value using the given formatter.