// Protocol Buffers - Google's data interchange format

// Copyright 2008 Google Inc.  All rights reserved.

//

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file or at

// https://developers.google.com/open-source/licenses/bsd

#ifndef GOOGLE_PROTOBUF_ANY_H__

#define GOOGLE_PROTOBUF_ANY_H__

#include <string>

#include "google/protobuf/port.h"

#include "google/protobuf/arenastring.h"

#include "google/protobuf/message_lite.h"

// Must be included last.

#include "google/protobuf/port_def.inc"

namespace google {

namespace protobuf {

class FieldDescriptor;

class Message;

namespace internal {

// "google.protobuf.Any".

PROTOBUF_EXPORT extern const char kAnyFullTypeName[];

// "type.googleapis.com/".

PROTOBUF_EXPORT extern const char kTypeGoogleApisComPrefix[];

// "type.googleprod.com/".

PROTOBUF_EXPORT extern const char kTypeGoogleProdComPrefix[];

std::string GetTypeUrl(absl::string_view message_name,

                       absl::string_view type_url_prefix);

// Helper class used to implement google::protobuf::Any.

class PROTOBUF_EXPORT AnyMetadata {

  typedef ArenaStringPtr UrlType;

  typedef ArenaStringPtr ValueType;

 public:

  // AnyMetadata does not take ownership of "type_url" and "value".

  constexpr AnyMetadata(UrlType* type_url, ValueType* value)

      : type_url_(type_url), value_(value) {}

  AnyMetadata(const AnyMetadata&) = delete;

  AnyMetadata& operator=(const AnyMetadata&) = delete;

  // Packs a message using the default type URL prefix: "type.googleapis.com".

  // The resulted type URL will be "type.googleapis.com/<message_full_name>".

  // Returns false if serializing the message failed.

  template <typename T>

  bool PackFrom(Arena* arena, const T& message) {

    return InternalPackFrom(arena, message, kTypeGoogleApisComPrefix,

                            T::FullMessageName());

  }

  bool PackFrom(Arena* arena, const Message& message);

  // Packs a message using the given type URL prefix. The type URL will be

  // constructed by concatenating the message type's full name to the prefix

  // with an optional "/" separator if the prefix doesn't already end with "/".

  // For example, both PackFrom(message, "type.googleapis.com") and

  // PackFrom(message, "type.googleapis.com/") yield the same result type

  // URL: "type.googleapis.com/<message_full_name>".

  // Returns false if serializing the message failed.

  template <typename T>

  bool PackFrom(Arena* arena, const T& message,

                absl::string_view type_url_prefix) {

    return InternalPackFrom(arena, message, type_url_prefix,

                            T::FullMessageName());

  }

  bool PackFrom(Arena* arena, const Message& message,

                absl::string_view type_url_prefix);

  // Unpacks the payload into the given message. Returns false if the message's

  // type doesn't match the type specified in the type URL (i.e., the full

  // name after the last "/" of the type URL doesn't match the message's actual

  // full name) or parsing the payload has failed.

  template <typename T>

  bool UnpackTo(T* message) const {

    return InternalUnpackTo(T::FullMessageName(), message);

  }

  bool UnpackTo(Message* message) const;

  // Checks whether the type specified in the type URL matches the given type.

  // A type is considered matching if its full name matches the full name after

  // the last "/" in the type URL.

  template <typename T>

  bool Is() const {

    return InternalIs(T::FullMessageName());

  }

 private:

  bool InternalPackFrom(Arena* arena, const MessageLite& message,

                        absl::string_view type_url_prefix,

                        absl::string_view type_name);

  bool InternalUnpackTo(absl::string_view type_name,

                        MessageLite* message) const;

  bool InternalIs(absl::string_view type_name) const;

  UrlType* type_url_;

  ValueType* value_;

};

// Get the proto type name from Any::type_url value. For example, passing

// "type.googleapis.com/rpc.QueryOrigin" will return "rpc.QueryOrigin" in

// *full_type_name. Returns false if the type_url does not have a "/"

// in the type url separating the full type name.

//

// NOTE: this function is available publicly as a static method on the

// generated message type: google::protobuf::Any::ParseAnyTypeUrl()

bool ParseAnyTypeUrl(absl::string_view type_url, std::string* full_type_name);

// Get the proto type name and prefix from Any::type_url value. For example,

// passing "type.googleapis.com/rpc.QueryOrigin" will return

// "type.googleapis.com/" in *url_prefix and "rpc.QueryOrigin" in

// *full_type_name. Returns false if the type_url does not have a "/" in the

// type url separating the full type name.

bool ParseAnyTypeUrl(absl::string_view type_url, std::string* url_prefix,

                     std::string* full_type_name);

// See if message is of type google.protobuf.Any, if so, return the descriptors

// for "type_url" and "value" fields.

bool GetAnyFieldDescriptors(const Message& message,

                            const FieldDescriptor** type_url_field,

                            const FieldDescriptor** value_field);

}  // namespace internal

}  // namespace protobuf

}  // namespace google

#include "google/protobuf/port_undef.inc"

#endif  // GOOGLE_PROTOBUF_ANY_H__