1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
extern crate serde;
pub mod uuid;
use serde::de::{DeserializeOwned, Deserializer};
use std::any::Any;
use std::collections::HashMap;
pub trait TypeUuid {
const UUID: u128;
}
pub trait DeserializeDyn: DeserializeOwned + Any {
fn deserialize_dyn<'de, D>(deserializer: D) -> Result<Box<dyn Any>, D::Error>
where
D: Deserializer<'de>;
}
impl<T> DeserializeDyn for T
where
T: DeserializeOwned + Any,
{
fn deserialize_dyn<'de, D>(deserializer: D) -> Result<Box<dyn Any>, D::Error>
where
D: Deserializer<'de>,
{
Self::deserialize(deserializer).map(|i| Box::new(i) as Box<dyn Any>)
}
}
pub struct TUSM<'de, D>
where
D: Deserializer<'de>,
{
mapping: HashMap<u128, fn(D) -> Result<Box<dyn Any>, D::Error>>,
}
impl<'de, D> TUSM<'de, D>
where
D: Deserializer<'de>,
{
pub fn new() -> Self {
Self {
mapping: HashMap::new(),
}
}
pub fn register<T: DeserializeDyn + TypeUuid>(&mut self) {
self.mapping.insert(T::UUID, T::deserialize_dyn);
}
pub fn deserialize_with_uuid(
&self,
uuid: &u128,
deserializer: D,
) -> Result<Box<dyn Any>, D::Error> {
self.mapping
.get(&uuid)
.expect("Type not registered! Please register this type first.")(deserializer)
}
}
#[cfg(test)]
mod tests {
extern crate ron;
use super::*;
#[test]
fn deser_test() {
let mut deserializer = ron::de::Deserializer::from_str("5").unwrap();
let mut tusm = TUSM::new();
tusm.register::<i32>();
let new_value = *tusm
.deserialize_with_uuid(&i32::UUID, &mut deserializer)
.unwrap()
.downcast::<i32>()
.unwrap();
assert_eq!(new_value, 5);
}
}