JsonService Class Reference

Manages loading and saving of a single JSON document using StorageManager. More...

#include <JsonService.h>

Collaboration diagram for JsonService:

Public Member Functions
	JsonService (StorageManager *storage)
	Construct a new JsonService.
bool	load (const std::string &path)
	Load a JSON file from storage.
bool	save (const std::string &path) const
	Save the current JSON data to storage.
nlohmann::json &	data ()
	Access the internal JSON object.
const nlohmann::json &	data () const
	Const access to the internal JSON object.
nlohmann::json &	root ()
	Alias for data().
const nlohmann::json &	root () const
	Const alias for data().
nlohmann::json &	operator* ()
	Operator alias for data().
const nlohmann::json &	operator* () const
	Const operator alias for data().
bool	hasValidData () const

Private Attributes
StorageManager *	storage
nlohmann::json	data_

Detailed Description

Definition at line 27 of file JsonService.h.

Constructor & Destructor Documentation

JsonService()

JsonService::JsonService

(

StorageManager *

storage

)

Construct a new JsonService.

Parameters

storage

Pointer to a StorageManager for persistent access.

Parameters

storage

Pointer to a StorageManager for persistent access.

Definition at line 48 of file JsonService.cpp.

    : storage(storage) {}

Member Function Documentation

data() [1/2]

nlohmann::json & JsonService::data

(

)

Access the internal JSON object.

Definition at line 104 of file JsonService.cpp.

{
    return data_;
}

References data_.

Referenced by FrameworkModel::getValue(), FrameworkModel::load(), FrameworkModel::save(), FrameworkModel::saveAll(), and FrameworkModel::setValue().

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data() [2/2]

const nlohmann::json & JsonService::data

(

)

const

Definition at line 110 of file JsonService.cpp.

{
    return data_;
}

References data_.

hasValidData()

bool JsonService::hasValidData

(

)

const

Definition at line 139 of file JsonService.cpp.

                                     {
    return !data_.is_discarded();
}

References data_.

load()

bool JsonService::load

(

const std::string &

path

)

Load a JSON file from storage.

Parameters

path	File path to load from.

Returns

true if load was successful and JSON parsed correctly.

Parameters

path	File path to load from.

Returns

true if load was successful and JSON parsed correctly.

Definition at line 52 of file JsonService.cpp.

{
    std::vector<uint8_t> buffer;
    if (!storage)
    return false;
 
    if(!storage->isMounted())
    {
       storage->mount();
    }
    
    if (!storage->readFile(path, buffer))
    {
        TRACE("Failed to read JSON file: %s\n", path.c_str());
        return false;
    }
 
    std::string str(buffer.begin(), buffer.end());
    TRACE("Loaded JSON file from %s: %zu bytes\n", path.c_str(), str.size());
    TRACE("Content: %s\n", str.c_str());
 
    // Treat empty file as valid empty object
    if (str.empty())
    {
        data_ = nlohmann::json::object();
        return true;
    }
 
    data_ = nlohmann::json::parse(str, nullptr, false); // No exceptions
    return !data_.is_discarded();
}

References data_, StorageManager::isMounted(), StorageManager::mount(), StorageManager::readFile(), storage, and TRACE.

Referenced by FrameworkModel::load().

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operator*() [1/2]

nlohmann::json & JsonService::operator*

(

)

Operator alias for data().

Definition at line 128 of file JsonService.cpp.

{
    return data_;
}

References data_.

operator*() [2/2]

const nlohmann::json & JsonService::operator*

(

)

const

Definition at line 134 of file JsonService.cpp.

{
    return data_;
}

References data_.

root() [1/2]

nlohmann::json & JsonService::root

(

)

Alias for data().

Definition at line 116 of file JsonService.cpp.

{
    return data_;
}

References data_.

root() [2/2]

const nlohmann::json & JsonService::root

(

)

const

Definition at line 122 of file JsonService.cpp.

{
    return data_;
}

References data_.

save()

bool JsonService::save

(

const std::string &

path

)

const

Save the current JSON data to storage.

Parameters

path	File path to save to.

Returns

true if save was successful.

Parameters

path	File path to save to.

Returns

true if save was successful.

Definition at line 85 of file JsonService.cpp.

{
    if (!storage)
        return false;
    if(!storage->isMounted())
    {
        storage->mount();
    }
    std::string content = data_.dump(2); // Pretty print
    std::vector<uint8_t> buffer(content.begin(), content.end());
    TRACE("Buffer size: %zu bytes\n", buffer.size());
    TRACE("Buffer content: %s\n", content.c_str());
 
    bool ok = storage->writeFile(path, buffer);
    TRACE("Saved JSON file to %s: %s\n", path.c_str(), ok ? "ok" : "failed");
    return ok;
}

References data_, StorageManager::isMounted(), StorageManager::mount(), storage, TRACE, and StorageManager::writeFile().

Referenced by FrameworkModel::save(), and FrameworkModel::saveAll().

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Member Data Documentation

data_

nlohmann::json JsonService::data_

private

Definition at line 84 of file JsonService.h.

Referenced by data(), data(), hasValidData(), load(), operator*(), operator*(), root(), root(), and save().

storage

StorageManager* JsonService::storage

private

Definition at line 83 of file JsonService.h.

Referenced by load(), and save().

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

• JsonService.h
• JsonService.cpp