protobuf 3.7.2

Rust implementation of Google protocol buffers
Documentation 
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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

use std::collections::BTreeMap;
use std::collections::HashMap;
use std::fmt;
use std::hash::Hash;

use crate::message_dyn::MessageDyn;
use crate::message_full::MessageFull;
use crate::reflect::acc::v2::AccessorV2;
use crate::reflect::acc::FieldAccessor;
use crate::reflect::map::ReflectMapMut;
use crate::reflect::map::ReflectMapRef;
use crate::reflect::runtime_types::RuntimeTypeMapKey;
use crate::reflect::runtime_types::RuntimeTypeTrait;
use crate::reflect::ProtobufValue;
use crate::reflect::RuntimeType;

pub(crate) trait MapFieldAccessor: Send + Sync + 'static {
    fn get_reflect<'a>(&self, m: &'a dyn MessageDyn) -> ReflectMapRef<'a>;
    fn mut_reflect<'a>(&self, m: &'a mut dyn MessageDyn) -> ReflectMapMut<'a>;
    fn _element_type(&self) -> (RuntimeType, RuntimeType);
}

pub(crate) struct MapFieldAccessorHolder {
    pub accessor: Box<dyn MapFieldAccessor>,
}

impl<'a> fmt::Debug for MapFieldAccessorHolder {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("MapFieldAccessorHolder").finish()
    }
}

struct MapFieldAccessorImpl<M, T>
where
    M: MessageFull,
{
    get_field: fn(&M) -> &T,
    mut_field: fn(&mut M) -> &mut T,
}

impl<M, K, V> MapFieldAccessor for MapFieldAccessorImpl<M, HashMap<K, V>>
where
    M: MessageFull,
    K: ProtobufValue + Eq + Hash,
    K::RuntimeType: RuntimeTypeMapKey,
    V: ProtobufValue,
{
    fn get_reflect<'a>(&self, m: &'a dyn MessageDyn) -> ReflectMapRef<'a> {
        let m = m.downcast_ref().unwrap();
        let map = (self.get_field)(m);
        ReflectMapRef::new(map)
    }

    fn mut_reflect<'a>(&self, m: &'a mut dyn MessageDyn) -> ReflectMapMut<'a> {
        let m = m.downcast_mut().unwrap();
        let map = (self.mut_field)(m);
        ReflectMapMut::new(map)
    }

    fn _element_type(&self) -> (RuntimeType, RuntimeType) {
        (
            K::RuntimeType::runtime_type_box(),
            V::RuntimeType::runtime_type_box(),
        )
    }
}

impl<M, K, V> MapFieldAccessor for MapFieldAccessorImpl<M, BTreeMap<K, V>>
where
    M: MessageFull,
    K: ProtobufValue + Ord,
    K::RuntimeType: RuntimeTypeMapKey,
    V: ProtobufValue,
{
    fn get_reflect<'a>(&self, m: &'a dyn MessageDyn) -> ReflectMapRef<'a> {
        let m = m.downcast_ref().unwrap();
        let map = (self.get_field)(m);
        ReflectMapRef::new(map)
    }

    fn mut_reflect<'a>(&self, m: &'a mut dyn MessageDyn) -> ReflectMapMut<'a> {
        let m = m.downcast_mut().unwrap();
        let map = (self.mut_field)(m);
        ReflectMapMut::new(map)
    }

    fn _element_type(&self) -> (RuntimeType, RuntimeType) {
        (
            K::RuntimeType::runtime_type_box(),
            V::RuntimeType::runtime_type_box(),
        )
    }
}

/// Make accessor for map field.
/// This is code generated by rust-protobuf before 3.5.
pub fn make_map_simpler_accessor<M, K, V>(
    name: &'static str,
    get_field: for<'a> fn(&'a M) -> &'a HashMap<K, V>,
    mut_field: for<'a> fn(&'a mut M) -> &'a mut HashMap<K, V>,
) -> FieldAccessor
where
    M: MessageFull + 'static,
    K: ProtobufValue + Hash + Eq,
    K::RuntimeType: RuntimeTypeMapKey,
    V: ProtobufValue,
{
    make_map_simpler_accessor_new(name, get_field, mut_field)
}

/// Make accessor for map field, new version
// This is only used in generated code.
// Rust compiler allows it, and we want to avoid exposing traits in public API.
#[allow(private_bounds)]
pub fn make_map_simpler_accessor_new<M, T>(
    name: &'static str,
    get_field: for<'a> fn(&'a M) -> &'a T,
    mut_field: for<'a> fn(&'a mut M) -> &'a mut T,
) -> FieldAccessor
where
    M: MessageFull,
    MapFieldAccessorImpl<M, T>: MapFieldAccessor,
{
    FieldAccessor::new(
        name,
        AccessorV2::Map(MapFieldAccessorHolder {
            accessor: Box::new(MapFieldAccessorImpl::<M, T> {
                get_field,
                mut_field,
            }),
        }),
    )
}