1// Copyright 2019 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package impl
6
7import (
8	"fmt"
9
10	pref "google.golang.org/protobuf/reflect/protoreflect"
11	"google.golang.org/protobuf/reflect/protoregistry"
12)
13
14// weakFields adds methods to the exported WeakFields type for internal use.
15//
16// The exported type is an alias to an unnamed type, so methods can't be
17// defined directly on it.
18type weakFields WeakFields
19
20func (w weakFields) get(num pref.FieldNumber) (pref.ProtoMessage, bool) {
21	m, ok := w[int32(num)]
22	return m, ok
23}
24
25func (w *weakFields) set(num pref.FieldNumber, m pref.ProtoMessage) {
26	if *w == nil {
27		*w = make(weakFields)
28	}
29	(*w)[int32(num)] = m
30}
31
32func (w *weakFields) clear(num pref.FieldNumber) {
33	delete(*w, int32(num))
34}
35
36func (Export) HasWeak(w WeakFields, num pref.FieldNumber) bool {
37	_, ok := w[int32(num)]
38	return ok
39}
40
41func (Export) ClearWeak(w *WeakFields, num pref.FieldNumber) {
42	delete(*w, int32(num))
43}
44
45func (Export) GetWeak(w WeakFields, num pref.FieldNumber, name pref.FullName) pref.ProtoMessage {
46	if m, ok := w[int32(num)]; ok {
47		return m
48	}
49	mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
50	if mt == nil {
51		panic(fmt.Sprintf("message %v for weak field is not linked in", name))
52	}
53	return mt.Zero().Interface()
54}
55
56func (Export) SetWeak(w *WeakFields, num pref.FieldNumber, name pref.FullName, m pref.ProtoMessage) {
57	if m != nil {
58		mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
59		if mt == nil {
60			panic(fmt.Sprintf("message %v for weak field is not linked in", name))
61		}
62		if mt != m.ProtoReflect().Type() {
63			panic(fmt.Sprintf("invalid message type for weak field: got %T, want %T", m, mt.Zero().Interface()))
64		}
65	}
66	if m == nil || !m.ProtoReflect().IsValid() {
67		delete(*w, int32(num))
68		return
69	}
70	if *w == nil {
71		*w = make(weakFields)
72	}
73	(*w)[int32(num)] = m
74}
75