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protounionfield.go
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/
protounionfield.go
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// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mappings
import (
"fmt"
"reflect"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
// protoOneOfField is a Field that is backed by a oneof value in proto.
type protoOneOfField struct {
t *reflectType
jsonKey string
fd protoreflect.FieldDescriptor
}
var _ Field = &protoOneOfField{}
// ID implements the Field interface.
func (f *protoOneOfField) ID() FieldID {
fieldID := toFieldID(f.jsonKey)
return fieldID
}
// getJSONKey implements the Field interface.
func (f *protoOneOfField) getJSONKey() string {
return f.jsonKey
}
// Type implements the Field interface.
func (f *protoOneOfField) Type() *reflectType {
return f.t
}
// isRequired implements the Field interface.
func (f *protoOneOfField) isRequired() bool {
return false
}
// getValue implements the Field interface.
func (f *protoOneOfField) getValue(p *point) *point {
protoMsg := p.rv.Interface().(proto.Message)
fdVal := protoMsg.ProtoReflect().Get(f.fd)
if !fdVal.IsValid() {
return nil
}
obj := fdVal.Message().Interface()
rv := reflect.ValueOf(obj)
out := p.scope.newPoint(rv)
return out
}
// setValue implements the Field interface.
func (f *protoOneOfField) setValue(p *point, srcVal reflect.Value) error {
if srcVal.IsNil() {
return nil
}
protoMsg := p.rv.Interface().(proto.Message)
fdVal := protoMsg.ProtoReflect().Get(f.fd)
fdObj := fdVal.Message().New()
destType := reflect.TypeOf(fdObj.Interface())
destVal, err := p.scope.convert(srcVal, destType)
if err != nil {
return fmt.Errorf("converting %v to %v: %w", srcVal.Type(), destType, err)
}
if !destVal.IsValid() {
return nil
}
destMsg := destVal.Interface().(proto.Message)
protoMsg.ProtoReflect().Set(f.fd, protoreflect.ValueOfMessage(destMsg.ProtoReflect()))
return nil
}