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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package proto provides functionality for handling protocol buffer messages.
// In particular, it provides marshaling and unmarshaling between a protobuf
// message and the binary wire format.
//
// See https://developers.google.com/protocol-buffers/docs/gotutorial for
// more information.
//
// Deprecated: Use the "google.golang.org/protobuf/proto" package instead.
package proto
import (
protoV2 "google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/runtime/protoiface"
"google.golang.org/protobuf/runtime/protoimpl"
)
const (
ProtoPackageIsVersion1 = true
ProtoPackageIsVersion2 = true
ProtoPackageIsVersion3 = true
ProtoPackageIsVersion4 = true
)
// GeneratedEnum is any enum type generated by protoc-gen-go
// which is a named int32 kind.
// This type exists for documentation purposes.
type GeneratedEnum interface{}
// GeneratedMessage is any message type generated by protoc-gen-go
// which is a pointer to a named struct kind.
// This type exists for documentation purposes.
type GeneratedMessage interface{}
// Message is a protocol buffer message.
//
// This is the v1 version of the message interface and is marginally better
// than an empty interface as it lacks any method to programatically interact
// with the contents of the message.
//
// A v2 message is declared in "google.golang.org/protobuf/proto".Message and
// exposes protobuf reflection as a first-class feature of the interface.
//
// To convert a v1 message to a v2 message, use the MessageV2 function.
// To convert a v2 message to a v1 message, use the MessageV1 function.
type Message = protoiface.MessageV1
// MessageV1 converts either a v1 or v2 message to a v1 message.
// It returns nil if m is nil.
func MessageV1(m GeneratedMessage) protoiface.MessageV1 {
return protoimpl.X.ProtoMessageV1Of(m)
}
// MessageV2 converts either a v1 or v2 message to a v2 message.
// It returns nil if m is nil.
func MessageV2(m GeneratedMessage) protoV2.Message {
return protoimpl.X.ProtoMessageV2Of(m)
}
// MessageReflect returns a reflective view for a message.
// It returns nil if m is nil.
func MessageReflect(m Message) protoreflect.Message {
return protoimpl.X.MessageOf(m)
}
// Marshaler is implemented by messages that can marshal themselves.
// This interface is used by the following functions: Size, Marshal,
// Buffer.Marshal, and Buffer.EncodeMessage.
//
// Deprecated: Do not implement.
type Marshaler interface {
// Marshal formats the encoded bytes of the message.
// It should be deterministic and emit valid protobuf wire data.
// The caller takes ownership of the returned buffer.
Marshal() ([]byte, error)
}
// Unmarshaler is implemented by messages that can unmarshal themselves.
// This interface is used by the following functions: Unmarshal, UnmarshalMerge,
// Buffer.Unmarshal, Buffer.DecodeMessage, and Buffer.DecodeGroup.
//
// Deprecated: Do not implement.
type Unmarshaler interface {
// Unmarshal parses the encoded bytes of the protobuf wire input.
// The provided buffer is only valid for during method call.
// It should not reset the receiver message.
Unmarshal([]byte) error
}
// Merger is implemented by messages that can merge themselves.
// This interface is used by the following functions: Clone and Merge.
//
// Deprecated: Do not implement.
type Merger interface {
// Merge merges the contents of src into the receiver message.
// It clones all data structures in src such that it aliases no mutable
// memory referenced by src.
Merge(src Message)
}
// RequiredNotSetError is an error type returned when
// marshaling or unmarshaling a message with missing required fields.
type RequiredNotSetError struct {
err error
}
func (e *RequiredNotSetError) Error() string {
if e.err != nil {
return e.err.Error()
}
return "proto: required field not set"
}
func (e *RequiredNotSetError) RequiredNotSet() bool {
return true
}
func checkRequiredNotSet(m protoV2.Message) error {
if err := protoV2.CheckInitialized(m); err != nil {
return &RequiredNotSetError{err: err}
}
return nil
}
// Clone returns a deep copy of src.
func Clone(src Message) Message {
return MessageV1(protoV2.Clone(MessageV2(src)))
}
// Merge merges src into dst, which must be messages of the same type.
//
// Populated scalar fields in src are copied to dst, while populated
// singular messages in src are merged into dst by recursively calling Merge.
// The elements of every list field in src is appended to the corresponded
// list fields in dst. The entries of every map field in src is copied into
// the corresponding map field in dst, possibly replacing existing entries.
// The unknown fields of src are appended to the unknown fields of dst.
func Merge(dst, src Message) {
protoV2.Merge(MessageV2(dst), MessageV2(src))
}
// Equal reports whether two messages are equal.
// If two messages marshal to the same bytes under deterministic serialization,
// then Equal is guaranteed to report true.
//
// Two messages are equal if they are the same protobuf message type,
// have the same set of populated known and extension field values,
// and the same set of unknown fields values.
//
// Scalar values are compared with the equivalent of the == operator in Go,
// except bytes values which are compared using bytes.Equal and
// floating point values which specially treat NaNs as equal.
// Message values are compared by recursively calling Equal.
// Lists are equal if each element value is also equal.
// Maps are equal if they have the same set of keys, where the pair of values
// for each key is also equal.
func Equal(x, y Message) bool {
return protoV2.Equal(MessageV2(x), MessageV2(y))
}
func isMessageSet(md protoreflect.MessageDescriptor) bool {
ms, ok := md.(interface{ IsMessageSet() bool })
return ok && ms.IsMessageSet()
}
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