1 files changed, 35 insertions, 0 deletions
diff --git a/vendor/icu_provider/src/datagen/iter.rs b/vendor/icu_provider/src/datagen/iter.rs
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index 000000000..6175d89c6
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+++ b/vendor/icu_provider/src/datagen/iter.rs
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+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+//! Collection of iteration APIs for data providers.
+
+use crate::prelude::*;
+
+/// A [`DynamicDataProvider`] that can iterate over all supported [`DataLocale`] for a certain key.
+///
+/// Implementing this trait means that a data provider knows all of the data it can successfully
+/// return from a load request.
+pub trait IterableDynamicDataProvider<M: DataMarker>: DynamicDataProvider<M> {
+    /// Given a [`DataKey`], returns a list of [`DataLocale`].
+    fn supported_locales_for_key(&self, key: DataKey) -> Result<Vec<DataLocale>, DataError>;
+}
+
+/// A [`DataProvider`] that can iterate over all supported [`DataLocale`] for a certain key.
+///
+/// Implementing this trait means that a data provider knows all of the data it can successfully
+/// return from a load request.
+pub trait IterableDataProvider<M: KeyedDataMarker>: DataProvider<M> {
+    /// Returns a list of [`DataLocale`].
+    fn supported_locales(&self) -> Result<Vec<DataLocale>, DataError>;
+}
+
+impl<M, P> IterableDynamicDataProvider<M> for Box<P>
+where
+    M: DataMarker,
+    P: IterableDynamicDataProvider<M> + ?Sized,
+{
+    fn supported_locales_for_key(&self, key: DataKey) -> Result<Vec<DataLocale>, DataError> {
+        (**self).supported_locales_for_key(key)
+    }
+}