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flutter::StandardMethodCodec Class Reference

`#include <standard_method_codec.h>`

Inheritance diagram for flutter::StandardMethodCodec:

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

## Static Public Member Functions
static const StandardMethodCodec & | GetInstance (const StandardCodecSerializer *serializer=nullptr)

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

## Detailed Description

Definition at line 18 of file standard_method_codec.h.

## Constructor & Destructor Documentation

## ◆ ~StandardMethodCodec()

flutter::StandardMethodCodec::~StandardMethodCodec | ( |  | ) |
| default

## ◆ StandardMethodCodec()

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

Referenced by GetInstance().

## Member Function Documentation

## ◆ DecodeAndProcessResponseEnvelopeInternal()

bool flutter::StandardMethodCodec::DecodeAndProcessResponseEnvelopeInternal | ( | const uint8_t * | response,
|  | size_t | response_size,
|  | MethodResult< EncodableValue > * | result
| ) |  | const
| overrideprotectedvirtual

Implements flutter::MethodCodec< EncodableValue >.

Definition at line 432 of file standard_codec.cc.

435 {
436 ByteBufferStreamReader stream(response, response_size);
437 uint8_t flag = stream.ReadByte();
438 switch (flag) {
439 case 0: {
440 EncodableValue value = serializer_->ReadValue(&stream);
441 if (value.IsNull()) {
442 result->Success();
443 } else {
444 result->Success(value);
445 }
446 return true;
447 }
448 case 1: {
449 EncodableValue code = serializer_->ReadValue(&stream);
450 EncodableValue message = serializer_->ReadValue(&stream);
451 EncodableValue details = serializer_->ReadValue(&stream);
452 const std::string& message_string =
453 message.IsNull() ? "" : std::get<std::string>(message);
454 if (details.IsNull()) {
455 result->Error(std::get<std::string>(code), message_string);
456 } else {
457 result->Error(std::get<std::string>(code), message_string, details);
458 }
459 return true;
460 }
461 default:
462 return false;
463 }
464 }

References flutter::MethodResult< T >::Error(), flutter::EncodableValue::IsNull(), flutter::ByteBufferStreamReader::ReadByte(), flutter::StandardCodecSerializer::ReadValue(), and flutter::MethodResult< T >::Success().

## ◆ DecodeMethodCallInternal()

std::unique_ptr< MethodCall< EncodableValue > > flutter::StandardMethodCodec::DecodeMethodCallInternal | ( | const uint8_t * | message,
|  | size_t | message_size
| ) |  | const
| overrideprotectedvirtual

Implements flutter::MethodCodec< EncodableValue >.

Definition at line 366 of file standard_codec.cc.

367 {
368 ByteBufferStreamReader stream(message, message_size);
369 EncodableValue method_name_value = serializer_->ReadValue(&stream);
370 const auto* method_name = std::get_if<std::string>(&method_name_value);
371 if (!method_name) {
372 std::cerr << "Invalid method call; method name is not a string."
373 << std::endl;
374 return nullptr;
375 }
376 auto arguments =
377 std::make_unique<EncodableValue>(serializer_->ReadValue(&stream));
378 return std::make_unique<MethodCall<EncodableValue>>(*method_name,
379 std::move(arguments));
380 }

References flutter::StandardCodecSerializer::ReadValue().

## ◆ EncodeErrorEnvelopeInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::StandardMethodCodec::EncodeErrorEnvelopeInternal | ( | const std::string & | error_code,
|  | const std::string & | error_message,
|  | const EncodableValue * | error_details
| ) |  | const
| overrideprotectedvirtual

Implements flutter::MethodCodec< EncodableValue >.

Definition at line 411 of file standard_codec.cc.

414 {
415 auto encoded = std::make_unique<std::vector<uint8_t>>();
416 ByteBufferStreamWriter stream(encoded.get());
417 stream.WriteByte(1);
418 serializer_->WriteValue(EncodableValue(error_code), &stream);
419 if (error_message.empty()) {
420 serializer_->WriteValue(EncodableValue(), &stream);
421 } else {
422 serializer_->WriteValue(EncodableValue(error_message), &stream);
423 }
424 if (error_details) {
425 serializer_->WriteValue(*error_details, &stream);
426 } else {
427 serializer_->WriteValue(EncodableValue(), &stream);
428 }
429 return encoded;
430 }

References flutter::StandardCodecSerializer::WriteValue().

## ◆ EncodeMethodCallInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::StandardMethodCodec::EncodeMethodCallInternal | ( | const MethodCall< EncodableValue > & | method_call | ) | const
| overrideprotectedvirtual

Implements flutter::MethodCodec< EncodableValue >.

Definition at line 383 of file standard_codec.cc.

384 {
385 auto encoded = std::make_unique<std::vector<uint8_t>>();
386 ByteBufferStreamWriter stream(encoded.get());
387 serializer_->WriteValue(EncodableValue(method_call.method_name()), &stream);
388 if (method_call.arguments()) {
389 serializer_->WriteValue(*method_call.arguments(), &stream);
390 } else {
391 serializer_->WriteValue(EncodableValue(), &stream);
392 }
393 return encoded;
394 }

References flutter::MethodCall< T >::arguments(), flutter::MethodCall< T >::method_name(), and flutter::StandardCodecSerializer::WriteValue().

## ◆ EncodeSuccessEnvelopeInternal()

std::unique_ptr< std::vector< uint8_t > > flutter::StandardMethodCodec::EncodeSuccessEnvelopeInternal | ( | const EncodableValue * | result | ) | const
| overrideprotectedvirtual

Implements flutter::MethodCodec< EncodableValue >.

Definition at line 397 of file standard_codec.cc.

398 {
399 auto encoded = std::make_unique<std::vector<uint8_t>>();
400 ByteBufferStreamWriter stream(encoded.get());
401 stream.WriteByte(0);
402 if (result) {
403 serializer_->WriteValue(*result, &stream);
404 } else {
405 serializer_->WriteValue(EncodableValue(), &stream);
406 }
407 return encoded;
408 }

References flutter::StandardCodecSerializer::WriteValue().

## ◆ GetInstance()

const StandardMethodCodec & flutter::StandardMethodCodec::GetInstance | ( | const StandardCodecSerializer * | serializer = `nullptr` | ) |
| static

Definition at line 340 of file standard_codec.cc.

341 {
342 if (!serializer) {
343 serializer = &StandardCodecSerializer::GetInstance();
344 }
345 static auto* sInstances = new std::map<const StandardCodecSerializer*,
346 std::unique_ptr<StandardMethodCodec>>;
347 auto it = sInstances->find(serializer);
348 if (it == sInstances->end()) {
349 // Uses new due to private constructor (to prevent API clients from
350 // accidentally passing temporary codec instances to channels).
351 auto emplace_result = sInstances->emplace(
352 serializer, std::unique_ptr<StandardMethodCodec>(
353 new StandardMethodCodec(serializer)));
354 it = emplace_result.first;
355 }
356 return *(it->second);
357 }

References flutter::StandardCodecSerializer::GetInstance(), and StandardMethodCodec().

Referenced by flutter::internal::ResizeChannel(), flutter::internal::SetChannelWarnsOnOverflow(), and flutter::TEST().

## ◆ operator=()

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

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

- shell/platform/common/client_wrapper/include/flutter/standard_method_codec.h
- shell/platform/common/client_wrapper/standard_codec.cc

flutter::StandardCodecSerializer::ReadValue
EncodableValue ReadValue(ByteStreamReader *stream) const
Definition: standard_codec.cc:92
flutter::EncodableValue::IsNull
bool IsNull() const
Definition: encodable_value.h:203
flutter::StandardCodecSerializer::WriteValue
virtual void WriteValue(const EncodableValue &value, ByteStreamWriter *stream) const
Definition: standard_codec.cc:98
flutter::StandardMethodCodec::StandardMethodCodec
StandardMethodCodec(StandardMethodCodec const &)=delete
flutter::StandardCodecSerializer::GetInstance
static const StandardCodecSerializer & GetInstance()
Definition: standard_codec.cc:87
flutter::MethodResult::Error
void Error(const std::string &error_code, const std::string &error_message, const T &error_details)
Definition: method_result.h:41
flutter::MethodResult::Success
void Success(const T &result)
Definition: method_result.h:29