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 "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 protoreflect.FieldNumber) (protoreflect.ProtoMessage, bool) { 21 m, ok := w[int32(num)] 22 return m, ok 23} 24 25func (w *weakFields) set(num protoreflect.FieldNumber, m protoreflect.ProtoMessage) { 26 if *w == nil { 27 *w = make(weakFields) 28 } 29 (*w)[int32(num)] = m 30} 31 32func (w *weakFields) clear(num protoreflect.FieldNumber) { 33 delete(*w, int32(num)) 34} 35 36func (Export) HasWeak(w WeakFields, num protoreflect.FieldNumber) bool { 37 _, ok := w[int32(num)] 38 return ok 39} 40 41func (Export) ClearWeak(w *WeakFields, num protoreflect.FieldNumber) { 42 delete(*w, int32(num)) 43} 44 45func (Export) GetWeak(w WeakFields, num protoreflect.FieldNumber, name protoreflect.FullName) protoreflect.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 protoreflect.FieldNumber, name protoreflect.FullName, m protoreflect.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