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message_codec.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_MESSAGE_CODEC_H_
6 #define FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_MESSAGE_CODEC_H_
7
8 #include <memory>
9 #include <string>
10 #include <vector>
11
12 namespace flutter {
13
14 // Translates between a binary message and higher-level method call and
15 // response/error objects.
16 template <typename T>
17 class MessageCodec {
18 public:
19 MessageCodec() = default;
20
21 virtual ~MessageCodec() = default;
22
23 // Prevent copying.
24 MessageCodec(MessageCodec<T> const&) = delete;
25 MessageCodec& operator=(MessageCodec<T> const&) = delete;
26
27 // Returns the message encoded in |binary_message|, or nullptr if it cannot be
28 // decoded by this codec.
29 std::unique_ptr<T> DecodeMessage(const uint8_t* binary_message,
30 const size_t message_size) const {
31 return std::move(DecodeMessageInternal(binary_message, message_size));
32 }
33
34 // Returns the message encoded in |binary_message|, or nullptr if it cannot be
35 // decoded by this codec.
36 std::unique_ptr<T> DecodeMessage(
37 const std::vector<uint8_t>& binary_message) const {
38 size_t size = binary_message.size();
39 const uint8_t* data = size > 0 ? &binary_message[0] : nullptr;
40 return std::move(DecodeMessageInternal(data, size));
41 }
42
43 // Returns a binary encoding of the given |message|, or nullptr if the
44 // message cannot be serialized by this codec.
45 std::unique_ptr<std::vector<uint8_t>> EncodeMessage(const T& message) const {
46 return std::move(EncodeMessageInternal(message));
47 }
48
49 protected:
50 // Implementation of the public interface, to be provided by subclasses.
51 virtual std::unique_ptr<T> DecodeMessageInternal(
52 const uint8_t* binary_message,
53 const size_t message_size) const = 0;
54
55 // Implementation of the public interface, to be provided by subclasses.
56 virtual std::unique_ptr<std::vector<uint8_t>> EncodeMessageInternal(
57 const T& message) const = 0;
58 };
59
60 } // namespace flutter
61
62 #endif // FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_MESSAGE_CODEC_H_
flutter::MessageCodec
Definition: message_codec.h:17
flutter::MessageCodec::operator=
MessageCodec & operator=(MessageCodec< T > const &)=delete
flutter::MessageCodec::EncodeMessageInternal
virtual std::unique_ptr< std::vector< uint8_t > > EncodeMessageInternal(const T &message) const =0
flutter::MessageCodec::DecodeMessage
std::unique_ptr< T > DecodeMessage(const uint8_t *binary_message, const size_t message_size) const
Definition: message_codec.h:29
flutter::MessageCodec::MessageCodec
MessageCodec()=default
flutter
Definition: accessibility_bridge.cc:14
flutter::MessageCodec::DecodeMessageInternal
virtual std::unique_ptr< T > DecodeMessageInternal(const uint8_t *binary_message, const size_t message_size) const =0
flutter::MessageCodec::EncodeMessage
std::unique_ptr< std::vector< uint8_t > > EncodeMessage(const T &message) const
Definition: message_codec.h:45
flutter::MessageCodec::~MessageCodec
virtual ~MessageCodec()=default
flutter::MessageCodec::DecodeMessage
std::unique_ptr< T > DecodeMessage(const std::vector< uint8_t > &binary_message) const
Definition: message_codec.h:36