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use std::iter::FromIterator;
use serde::{Serialize, Serializer, Deserialize, Deserializer};
use ::codec::{SerializeValue, DeserializeValue};
#[derive(Debug)]
pub struct ValueList<T>(ValueListInner<T>);
impl<T> ValueList<T> {
pub fn new<I>(values: I) -> ValueList<T>
where I: IntoIterator<Item = ::Value<T>>
{
ValueList(ValueListInner::Values(Vec::from_iter(values)))
}
pub fn reference<S: Into<String>>(id: S) -> ValueList<T> {
ValueList(ValueListInner::Ref(id.into()))
}
pub fn as_values(&self) -> Option<&[::Value<T>]> {
if let ValueListInner::Values(ref values) = self.0 {
Some(values)
} else {
None
}
}
pub fn as_reference(&self) -> Option<&str> {
if let ValueListInner::Ref(ref ref_id) = self.0 {
Some(ref_id)
} else {
None
}
}
}
impl<T> Default for ValueList<T> {
fn default() -> ValueList<T> {
ValueList(ValueListInner::Values(Vec::new()))
}
}
impl<T> FromIterator<::Value<T>> for ValueList<T> {
fn from_iter<I>(iter: I) -> ValueList<T>
where I: IntoIterator<Item = ::Value<T>>
{
ValueList::new(iter)
}
}
#[derive(Debug)]
enum ValueListInner<T> {
Values(Vec<::Value<T>>),
Ref(String)
}
#[derive(Serialize, Deserialize)]
struct SerdeRef<'a> {
#[serde(rename = "Ref", borrow)]
id: &'a str
}
#[derive(Serialize)]
#[serde(untagged, bound = "T: SerializeValue")]
enum SerializeValueList<'a, T: 'a> {
Values(&'a Vec<::Value<T>>),
#[serde(borrow)]
Ref(SerdeRef<'a>)
}
#[derive(Deserialize)]
#[serde(untagged, bound = "T: DeserializeValue")]
enum DeserializeValueList<'a, T> {
Values(Vec<::Value<T>>),
#[serde(borrow)]
Ref(SerdeRef<'a>)
}
impl<T: SerializeValue> Serialize for ValueList<T> {
fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
let proxy = match self.0 {
ValueListInner::Values(ref values) => SerializeValueList::Values(values),
ValueListInner::Ref(ref id) => SerializeValueList::Ref(SerdeRef { id })
};
Serialize::serialize(&proxy, s)
}
}
impl<'de, T: DeserializeValue> Deserialize<'de> for ValueList<T> {
fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
Deserialize::deserialize(d).map(|proxy| {
let inner = match proxy {
DeserializeValueList::Values(t) =>
ValueListInner::Values(t),
DeserializeValueList::Ref(SerdeRef { id }) =>
ValueListInner::Ref(id.to_owned())
};
ValueList(inner)
})
}
}