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use std::collections::{
HashMap, HashSet
};
use serde::{Serialize, Serializer};
use mail_core::Resource;
use mail_headers::header_components::ContentId;
pub struct AdditionalCIds<'a> {
additional_resources: &'a [&'a HashMap<String, Resource>]
}
impl<'a> AdditionalCIds<'a> {
pub(crate) fn new(additional_resources: &'a [&'a HashMap<String, Resource>]) -> Self {
AdditionalCIds { additional_resources }
}
pub fn get(&self, name: &str) -> Option<&ContentId> {
for possible_source in self.additional_resources {
if let Some(res) = possible_source.get(name) {
return Some(res.content_id().expect("all resources should be loaded/have a content id"));
}
}
return None;
}
}
impl<'a> Serialize for AdditionalCIds<'a> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
let mut existing_keys = HashSet::new();
serializer.collect_map(
self.additional_resources
.iter()
.flat_map(|m| m.iter().map(|(k, resc)| {
(k, resc.content_id().expect("all resources should be loaded/have a content id"))
}))
.filter(|key| existing_keys.insert(key.to_owned()))
)
}
}