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flutter::JsonMethodCodec Class Reference

`#include <json_method_codec.h>`

Inheritance diagram for flutter::JsonMethodCodec:

## Public Member Functions
| ~JsonMethodCodec ()=default
| JsonMethodCodec (JsonMethodCodec const &)=delete
JsonMethodCodec & | operator= (JsonMethodCodec const &)=delete
Public Member Functions inherited from flutter::MethodCodec< rapidjson::Document >
| MethodCodec ()=default
| MethodCodec (MethodCodec< rapidjson::Document > const &)=delete
virtual | ~MethodCodec ()=default
MethodCodec & | operator= (MethodCodec< rapidjson::Document > const &)=delete
std::unique_ptr< MethodCall< rapidjson::Document > > | DecodeMethodCall (const uint8_t *message, size_t message_size) const
std::unique_ptr< MethodCall< rapidjson::Document > > | DecodeMethodCall (const std::vector< uint8_t > &message) const
std::unique_ptr< std::vector< uint8_t > > | EncodeMethodCall (const MethodCall< rapidjson::Document > &method_call) const
std::unique_ptr< std::vector< uint8_t > > | EncodeSuccessEnvelope (const rapidjson::Document *result=nullptr) const
std::unique_ptr< std::vector< uint8_t > > | EncodeErrorEnvelope (const std::string &error_code, const std::string &error_message="", const rapidjson::Document *error_details=nullptr) const
bool | DecodeAndProcessResponseEnvelope (const uint8_t *response, size_t response_size, MethodResult< rapidjson::Document > *result) const

## Static Public Member Functions
static const JsonMethodCodec & | GetInstance ()

## Protected Member Functions
| JsonMethodCodec ()=default
std::unique_ptr< MethodCall< rapidjson::Document > > | DecodeMethodCallInternal (const uint8_t *message, const size_t message_size) const override
std::unique_ptr< std::vector< uint8_t > > | EncodeMethodCallInternal (const MethodCall< rapidjson::Document > &method_call) const override
std::unique_ptr< std::vector< uint8_t > > | EncodeSuccessEnvelopeInternal (const rapidjson::Document *result) const override
std::unique_ptr< std::vector< uint8_t > > | EncodeErrorEnvelopeInternal (const std::string &error_code, const std::string &error_message, const rapidjson::Document *error_details) const override
bool | DecodeAndProcessResponseEnvelopeInternal (const uint8_t *response, const size_t response_size, MethodResult< rapidjson::Document > *result) const override

## Detailed Description

Definition at line 16 of file json_method_codec.h.

## Constructor & Destructor Documentation

## ◆ ~JsonMethodCodec()

flutter::JsonMethodCodec::~JsonMethodCodec | ( |  | ) |
| default

## ◆ JsonMethodCodec() [1/2]

flutter::JsonMethodCodec::JsonMethodCodec | ( | JsonMethodCodec const & |  | ) |
| delete

## ◆ JsonMethodCodec() [2/2]

flutter::JsonMethodCodec::JsonMethodCodec | ( |  | ) |
| protected default

## Member Function Documentation

## ◆ DecodeAndProcessResponseEnvelopeInternal()

bool flutter::JsonMethodCodec::DecodeAndProcessResponseEnvelopeInternal | ( | const uint8_t * | response,
|  | const size_t | response_size,
|  | MethodResult< rapidjson::Document > * | result
| ) |  | const
| override protected virtual

Implements flutter::MethodCodec< rapidjson::Document >.

Definition at line 118 of file json_method_codec.cc.

121 {
122 std::unique_ptr<rapidjson::Document> json_response =
123 JsonMessageCodec::GetInstance().DecodeMessage(response, response_size);
124 if (!json_response) {
125 return false;
126 }
127 if (!json_response->IsArray()) {
128 return false;
129 }
130 switch (json_response->Size()) {
131 case 1: {
132 std::unique_ptr<rapidjson::Document> value =
133 ExtractElement(json_response.get(), &((*json_response)[0]));
134 if (value->IsNull()) {
135 result->Success();
136 } else {
137 result->Success(*value);
138 }
139 return true;
140 }
141 case 3: {
142 std::string code = (*json_response)[0].GetString();
143 std::string message = (*json_response)[1].GetString();
144 std::unique_ptr<rapidjson::Document> details =
145 ExtractElement(json_response.get(), &((*json_response)[2]));
146 if (details->IsNull()) {
147 result->Error(code, message);
148 } else {
149 result->Error(code, message, *details);
150 }
151 return true;
152 }
153 default:
154 return false;
155 }
156 }

References flutter::MessageCodec< T >::DecodeMessage(), flutter::MethodResult< T >::Error(), flutter::JsonMessageCodec::GetInstance(), and flutter::MethodResult< T >::Success().

## ◆ DecodeMethodCallInternal()

std::unique_ptr< MethodCall< rapidjson::Document > > flutter::JsonMethodCodec::DecodeMethodCallInternal | ( | const uint8_t * | message,
|  | const size_t | message_size
| ) |  | const
| override protected virtual

Implements flutter::MethodCodec< rapidjson::Document >.

Definition at line 42 of file json_method_codec.cc.

43 {
44 std::unique_ptr<rapidjson::Document> json_message =
45 JsonMessageCodec::GetInstance().DecodeMessage(message, message_size);
46 if (!json_message) {
47 return nullptr;
48 }
49
50 auto method_name_iter = json_message->FindMember(kMessageMethodKey);
51 if (method_name_iter == json_message->MemberEnd()) {
52 return nullptr;
53 }
54 if (!method_name_iter->value.IsString()) {
55 return nullptr;
56 }
57 std::string method_name(method_name_iter->value.GetString());
58 auto arguments_iter = json_message->FindMember(kMessageArgumentsKey);
59 std::unique_ptr<rapidjson::Document> arguments;
60 if (arguments_iter != json_message->MemberEnd()) {
61 arguments = ExtractElement(json_message.get(), &(arguments_iter->value));
62 }
63 return std::make_unique<MethodCall<rapidjson::Document>>(
64 method_name, std::move(arguments));
65 }

References flutter::MessageCodec< T >::DecodeMessage(), and flutter::JsonMessageCodec::GetInstance().

## ◆ EncodeErrorEnvelopeInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::JsonMethodCodec::EncodeErrorEnvelopeInternal | ( | const std::string & | error_code,
|  | const std::string & | error_message,
|  | const rapidjson::Document * | error_details
| ) |  | const
| override protected virtual

Implements flutter::MethodCodec< rapidjson::Document >.

Definition at line 100 of file json_method_codec.cc.

103 {
104 // NOLINTNEXTLINE(clang-analyzer-core.NullDereference)
105 rapidjson::Document envelope(rapidjson::kArrayType);
106 auto& allocator = envelope.GetAllocator();
107 envelope.PushBack(rapidjson::Value(error_code, allocator), allocator);
108 envelope.PushBack(rapidjson::Value(error_message, allocator), allocator);
109 rapidjson::Value details_value;
110 if (error_details) {
111 details_value.CopyFrom(*error_details, allocator);
112 }
113 envelope.PushBack(details_value, allocator);
114
115 return JsonMessageCodec::GetInstance().EncodeMessage(envelope);
116 }

References flutter::MessageCodec< T >::EncodeMessage(), and flutter::JsonMessageCodec::GetInstance().

## ◆ EncodeMethodCallInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::JsonMethodCodec::EncodeMethodCallInternal | ( | const MethodCall< rapidjson::Document > & | method_call | ) | const
| override protected virtual

Implements flutter::MethodCodec< rapidjson::Document >.

Definition at line 67 of file json_method_codec.cc.

68 {
69 // TODO(stuartmorgan): Consider revisiting the codec APIs to avoid the need
70 // to copy everything when doing encoding (e.g., by having a version that
71 // takes owership of the object to encode, so that it can be moved instead).
72 rapidjson::Document message(rapidjson::kObjectType);
73 auto& allocator = message.GetAllocator();
74 rapidjson::Value name(method_call.method_name(), allocator);
75 rapidjson::Value arguments;
76 if (method_call.arguments()) {
77 arguments.CopyFrom(*method_call.arguments(), allocator);
78 }
79 message.AddMember(kMessageMethodKey, name, allocator);
80 message.AddMember(kMessageArgumentsKey, arguments, allocator);
81
82 return JsonMessageCodec::GetInstance().EncodeMessage(message);
83 }

References flutter::MethodCall< T >::arguments(), flutter::MessageCodec< T >::EncodeMessage(), flutter::JsonMessageCodec::GetInstance(), and flutter::MethodCall< T >::method_name().

## ◆ EncodeSuccessEnvelopeInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::JsonMethodCodec::EncodeSuccessEnvelopeInternal | ( | const rapidjson::Document * | result | ) | const
| override protected virtual

Implements flutter::MethodCodec< rapidjson::Document >.

Definition at line 86 of file json_method_codec.cc.

87 {
88 rapidjson::Document envelope;
89 envelope.SetArray();
90 rapidjson::Value result_value;
91 if (result) {
92 result_value.CopyFrom(*result, envelope.GetAllocator());
93 }
94 envelope.PushBack(result_value, envelope.GetAllocator());
95
96 return JsonMessageCodec::GetInstance().EncodeMessage(envelope);
97 }

References flutter::MessageCodec< T >::EncodeMessage(), and flutter::JsonMessageCodec::GetInstance().

## ◆ GetInstance()

const JsonMethodCodec & flutter::JsonMethodCodec::GetInstance | ( |  | ) |
| static

Definition at line 36 of file json_method_codec.cc.

36 {
37 static JsonMethodCodec sInstance;
38 return sInstance;
39 }

Referenced by flutter::TEST().

## ◆ operator=()

JsonMethodCodec& flutter::JsonMethodCodec::operator= | ( | JsonMethodCodec const & |  | ) |
| delete

The documentation for this class was generated from the following files:

- shell/platform/common/json_method_codec.h
- shell/platform/common/json_method_codec.cc

flutter::JsonMessageCodec::GetInstance
static const JsonMessageCodec & GetInstance()
Definition: json_message_codec.cc:17
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::EncodeMessage
std::unique_ptr< std::vector< uint8_t > > EncodeMessage(const T &message) const
Definition: message_codec.h:45
flutter::JsonMethodCodec::JsonMethodCodec
JsonMethodCodec()=default