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use std::collections::{BTreeMap, HashMap};
use stable_vec::StableVec;
use crate::types::{DecryptionKey, ProtocolVersion};
mod private {
pub trait Sealed {}
impl<'a> Sealed for crate::MediaSegment<'a> {}
impl<'a> Sealed for crate::tags::ExtXMap<'a> {}
}
pub trait Decryptable<'a>: private::Sealed {
#[must_use]
fn keys(&self) -> Vec<&DecryptionKey<'a>>;
#[must_use]
#[inline]
fn first_key(&self) -> Option<&DecryptionKey<'a>> {
<Self as Decryptable>::keys(self).first().copied()
}
#[must_use]
#[inline]
fn len(&self) -> usize { <Self as Decryptable>::keys(self).len() }
#[must_use]
#[inline]
fn is_empty(&self) -> bool { <Self as Decryptable>::len(self) == 0 }
}
#[doc(hidden)]
pub trait RequiredVersion {
#[must_use]
fn required_version(&self) -> ProtocolVersion;
#[must_use]
fn introduced_version(&self) -> ProtocolVersion { self.required_version() }
}
impl<T: RequiredVersion> RequiredVersion for Vec<T> {
fn required_version(&self) -> ProtocolVersion {
self.iter()
.map(RequiredVersion::required_version)
.max()
.unwrap_or_default()
}
}
impl<K, V: RequiredVersion> RequiredVersion for BTreeMap<K, V> {
fn required_version(&self) -> ProtocolVersion {
self.values()
.map(RequiredVersion::required_version)
.max()
.unwrap_or_default()
}
}
impl<T: RequiredVersion> RequiredVersion for Option<T> {
fn required_version(&self) -> ProtocolVersion {
self.iter()
.map(RequiredVersion::required_version)
.max()
.unwrap_or_default()
}
}
impl<K, V: RequiredVersion, S> RequiredVersion for HashMap<K, V, S> {
fn required_version(&self) -> ProtocolVersion {
self.values()
.map(RequiredVersion::required_version)
.max()
.unwrap_or_default()
}
}
impl<T: RequiredVersion> RequiredVersion for StableVec<T> {
fn required_version(&self) -> ProtocolVersion {
self.values()
.map(RequiredVersion::required_version)
.max()
.unwrap_or_default()
}
}
#[cfg(test)]
mod tests {
use super::*;
use pretty_assertions::assert_eq;
#[test]
fn test_required_version_trait() {
struct Example;
impl RequiredVersion for Example {
fn required_version(&self) -> ProtocolVersion { ProtocolVersion::V3 }
}
assert_eq!(Example.required_version(), ProtocolVersion::V3);
assert_eq!(Example.introduced_version(), ProtocolVersion::V3);
}
}