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use std::cmp;
use std::collections::HashMap;
use std::convert::From;
use std::error;
use std::fmt::{self, Display};
use std::hash;
use std::str::FromStr;
use chrono::{DateTime, Utc};
use serde;
use serde::ser::SerializeSeq;
use serde_json;
trait HasId<T> {
fn id(&self) -> T;
}
#[derive(Serialize, Deserialize, Debug)]
pub struct Vendor {
pub id: u16,
pub name: String,
#[serde(rename = "policyUrl")]
pub policy_url: String,
#[serde(rename = "purposeIds")]
pub purpose_ids: Vec<u8>,
#[serde(rename = "legIntPurposeIds")]
pub leg_int_purpose_ids: Vec<u8>,
#[serde(rename = "featureIds")]
pub feature_ids: Vec<u8>,
}
impl HasId<u16> for Vendor {
fn id(&self) -> u16 {
self.id
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct Purpose {
pub id: u8,
pub name: String,
pub description: String,
}
impl HasId<u8> for Purpose {
fn id(&self) -> u8 {
self.id
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct Feature {
pub id: u8,
pub name: String,
pub description: String,
}
impl HasId<u8> for Feature {
fn id(&self) -> u8 {
self.id
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct VendorList {
#[serde(rename = "vendorListVersion")]
pub version: u16,
#[serde(rename = "lastUpdated")]
pub last_updated: DateTime<Utc>,
#[serde(
serialize_with = "serialize_id_map_as_list",
deserialize_with = "deserialize_list_as_id_map"
)]
pub purposes: HashMap<u8, Purpose>,
#[serde(
serialize_with = "serialize_id_map_as_list",
deserialize_with = "deserialize_list_as_id_map"
)]
pub features: HashMap<u8, Feature>,
#[serde(
serialize_with = "serialize_id_map_as_list",
deserialize_with = "deserialize_list_as_id_map"
)]
pub vendors: HashMap<u16, Vendor>,
}
impl VendorList {
pub fn to_string(&self) -> Result<String, Error> {
serde_json::to_string(self).map_err(From::from)
}
}
impl FromStr for VendorList {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
serde_json::from_str(s).map_err(From::from)
}
}
#[derive(Debug)]
pub enum Error {
JsonError(serde_json::Error),
Other(String),
}
impl error::Error for Error {
fn description(&self) -> &str {
match self {
Error::JsonError(ref err) => err.description(),
Error::Other(msg) => msg,
}
}
fn cause(&self) -> Option<&error::Error> {
match self {
Error::JsonError(ref err) => Some(err),
Error::Other(_) => None,
}
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::JsonError(ref err) => Display::fmt(err, f),
Error::Other(msg) => Display::fmt(msg, f),
}
}
}
impl From<serde_json::Error> for Error {
fn from(e: serde_json::Error) -> Error {
Error::JsonError(e)
}
}
fn deserialize_list_as_id_map<'de, D, K, V>(deserializer: D) -> Result<HashMap<K, V>, D::Error>
where
D: serde::Deserializer<'de>,
K: Eq + hash::Hash,
V: HasId<K> + serde::Deserialize<'de>,
{
let values: Vec<V> = serde::Deserialize::deserialize(deserializer)?;
Ok(values.into_iter().map(|v| (v.id(), v)).collect())
}
fn serialize_id_map_as_list<S, K, V>(map: &HashMap<K, V>, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
K: Eq + hash::Hash + cmp::Ord,
V: HasId<K> + serde::Serialize,
{
let mut values: Vec<&V> = map.iter().map(|(_, v)| v).collect();
values.sort_by_key(|v| v.id());
let mut seq = serializer.serialize_seq(Some(values.len()))?;
for element in values.iter() {
seq.serialize_element(element)?;
}
seq.end()
}
#[cfg(test)]
mod tests {
#[test]
fn serialize_good() {}
#[test]
fn deserialize_good() {}
}