1 use std::mem;
2 
3 use super::value::ProtobufValue;
4 
5 use crate::singular::*;
6 
7 pub trait ReflectOptional: 'static {
to_option(&self) -> Option<&dyn ProtobufValue>8     fn to_option(&self) -> Option<&dyn ProtobufValue>;
9 
set_value(&mut self, value: &dyn ProtobufValue)10     fn set_value(&mut self, value: &dyn ProtobufValue);
11 }
12 
13 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for Option<V> {
to_option(&self) -> Option<&dyn ProtobufValue>14     fn to_option(&self) -> Option<&dyn ProtobufValue> {
15         self.as_ref().map(|v| v as &dyn ProtobufValue)
16     }
17 
set_value(&mut self, value: &dyn ProtobufValue)18     fn set_value(&mut self, value: &dyn ProtobufValue) {
19         match value.as_any().downcast_ref::<V>() {
20             Some(v) => mem::replace(self, Some(v.clone())),
21             None => panic!(),
22         };
23     }
24 }
25 
26 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularField<V> {
to_option(&self) -> Option<&dyn ProtobufValue>27     fn to_option(&self) -> Option<&dyn ProtobufValue> {
28         self.as_ref().map(|v| v as &dyn ProtobufValue)
29     }
30 
set_value(&mut self, value: &dyn ProtobufValue)31     fn set_value(&mut self, value: &dyn ProtobufValue) {
32         match value.as_any().downcast_ref::<V>() {
33             Some(v) => mem::replace(self, SingularField::some(v.clone())),
34             None => panic!(),
35         };
36     }
37 }
38 
39 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularPtrField<V> {
to_option(&self) -> Option<&dyn ProtobufValue>40     fn to_option(&self) -> Option<&dyn ProtobufValue> {
41         self.as_ref().map(|v| v as &dyn ProtobufValue)
42     }
43 
set_value(&mut self, value: &dyn ProtobufValue)44     fn set_value(&mut self, value: &dyn ProtobufValue) {
45         match value.as_any().downcast_ref::<V>() {
46             Some(v) => mem::replace(self, SingularPtrField::some(v.clone())),
47             None => panic!(),
48         };
49     }
50 }
51