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

use std::mem;

use super::value::ProtobufValue;

use singular::*;

pub trait ReflectOptional: 'static {
    fn to_option(&self) -> Option<&ProtobufValue>;

    fn set_value(&mut self, value: &ProtobufValue);
}

impl<V: ProtobufValue + Clone + 'static> ReflectOptional for Option<V> {
    fn to_option(&self) -> Option<&ProtobufValue> {
        self.as_ref().map(|v| v as &ProtobufValue)
    }

    fn set_value(&mut self, value: &ProtobufValue) {
        match value.as_any().downcast_ref::<V>() {
            Some(v) => mem::replace(self, Some(v.clone())),
            None => panic!(),
        };
    }
}

impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularField<V> {
    fn to_option(&self) -> Option<&ProtobufValue> {
        self.as_ref().map(|v| v as &ProtobufValue)
    }

    fn set_value(&mut self, value: &ProtobufValue) {
        match value.as_any().downcast_ref::<V>() {
            Some(v) => mem::replace(self, SingularField::some(v.clone())),
            None => panic!(),
        };
    }
}

impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularPtrField<V> {
    fn to_option(&self) -> Option<&ProtobufValue> {
        self.as_ref().map(|v| v as &ProtobufValue)
    }

    fn set_value(&mut self, value: &ProtobufValue) {
        match value.as_any().downcast_ref::<V>() {
            Some(v) => mem::replace(self, SingularPtrField::some(v.clone())),
            None => panic!(),
        };
    }
}