ModelView::JsonItemDataConverter Class Reference

Default converter of SessionItemData to/from json object. More...

Inheritance diagram for ModelView::JsonItemDataConverter:

Collaboration diagram for ModelView::JsonItemDataConverter:

Public Types
using	accept_strategy_t = std::function< bool(int)>

Public Member Functions
	JsonItemDataConverter (accept_strategy_t to_json_accept={}, accept_strategy_t from_json_accept={})
	~JsonItemDataConverter () override
void	from_json (const QJsonArray &object, SessionItemData &data) override
	Updates existing data with JSON content. More...
QJsonArray	to_json (const SessionItemData &data) override
	Converts SessionItemData to JSON;. More...

Static Public Member Functions
static std::unique_ptr< JsonItemDataConverterInterface >	createCopyConverter ()
	Creates JSON data converter intended for simple data copying. Nothing is filtered out. More...
static std::unique_ptr< JsonItemDataConverterInterface >	createProjectConverter ()
	Creates JSON data converter intended for project saving. More...

Private Member Functions
bool	isRoleFromJson (int role) const
	Returns true if given role should be parsed from json object. More...
bool	isRoleToJson (int role) const
	Returns true if given role should be saved in json object. More...

Private Attributes
accept_strategy_t	m_from_json_accept
	callback to find whether to read role from json More...
accept_strategy_t	m_to_json_accept
	callback to find whether to write role to json More...
std::unique_ptr< JsonVariantConverterInterface >	m_variant_converter

Detailed Description

Default converter of SessionItemData to/from json object.

Definition at line 31 of file jsonitemdataconverter.h.

Member Typedef Documentation

accept_strategy_t

using ModelView::JsonItemDataConverter::accept_strategy_t = std::function<bool(int)>

Definition at line 33 of file jsonitemdataconverter.h.

Constructor & Destructor Documentation

JsonItemDataConverter()

JsonItemDataConverter::JsonItemDataConverter	(	accept_strategy_t	to_json_accept = {},
		accept_strategy_t	from_json_accept = {}
	)

Definition at line 35 of file jsonitemdataconverter.cpp.

    : m_to_json_accept(to_json_accept)
    , m_from_json_accept(from_json_accept)
    , m_variant_converter(std::make_unique<JsonVariantConverter>())
{
}

~JsonItemDataConverter()

JsonItemDataConverter::~JsonItemDataConverter ( )

overridedefault

Member Function Documentation

createCopyConverter()

std::unique_ptr< JsonItemDataConverterInterface > JsonItemDataConverter::createCopyConverter ( )

static

Creates JSON data converter intended for simple data copying. Nothing is filtered out.

Definition at line 93 of file jsonitemdataconverter.cpp.

{
    return std::make_unique<JsonItemDataConverter>();
}

Referenced by TEST_F().

createProjectConverter()

std::unique_ptr< JsonItemDataConverterInterface > JsonItemDataConverter::createProjectConverter ( )

static

Creates JSON data converter intended for project saving.

Only IDENTIFIER and DATA gous to/from JSON.

Definition at line 101 of file jsonitemdataconverter.cpp.

{
    auto accept_roles = [](auto role) {
        return role == ItemDataRole::IDENTIFIER || role == ItemDataRole::DATA;
    };
    return std::make_unique<JsonItemDataConverter>(accept_roles, accept_roles);
}

References ModelView::ItemDataRole::DATA, and ModelView::ItemDataRole::IDENTIFIER.

Referenced by TEST_F().

from_json()

void JsonItemDataConverter::from_json ( const QJsonArray &  object, SessionItemData &  data  )

overridevirtual

Updates existing data with JSON content.

Implements ModelView::JsonItemDataConverterInterface.

Definition at line 63 of file jsonitemdataconverter.cpp.

{
    static JsonItemFormatAssistant assistant;
    auto persistent_data = std::make_unique<SessionItemData>();
 
    for (const auto& x : object) {
        if (!assistant.isSessionItemData(x.toObject()))
            throw std::runtime_error("JsonItemData::get_data() -> Invalid json object.");
        auto role = keyValue(x, JsonItemFormatAssistant::roleKey).toInt();
        auto variant = m_variant_converter->get_variant(
            keyValue(x, JsonItemFormatAssistant::variantKey).toObject());
        if (isRoleFromJson(role))
            persistent_data->setData(variant, role);
    }
 
    auto runtime_roles = data.roles();
    auto persistent_roles = persistent_data->roles();
 
    std::set<int> roles(runtime_roles.begin(), runtime_roles.end());
    roles.insert(persistent_roles.begin(), persistent_roles.end());
 
    for (auto role : roles) {
        // all roles existing in `persistent` will be taken from there
        if (persistent_data->hasData(role))
            data.setData(persistent_data->data(role), role);
    }
}

References isRoleFromJson(), ModelView::JsonItemFormatAssistant::isSessionItemData(), m_variant_converter, ModelView::JsonItemFormatAssistant::roleKey, ModelView::SessionItemData::roles(), ModelView::SessionItemData::setData(), and ModelView::JsonItemFormatAssistant::variantKey.

Referenced by TEST_F().

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isRoleFromJson()

bool JsonItemDataConverter::isRoleFromJson ( int  role ) const

private

Returns true if given role should be parsed from json object.

Definition at line 118 of file jsonitemdataconverter.cpp.

{
    return m_from_json_accept ? m_from_json_accept(role) : true;
}

References m_from_json_accept.

Referenced by from_json().

isRoleToJson()

bool JsonItemDataConverter::isRoleToJson ( int  role ) const

private

Returns true if given role should be saved in json object.

Definition at line 111 of file jsonitemdataconverter.cpp.

{
    return m_to_json_accept ? m_to_json_accept(role) : true;
}

References m_to_json_accept.

Referenced by to_json().

to_json()

QJsonArray JsonItemDataConverter::to_json ( const SessionItemData &  )

overridevirtual

Converts SessionItemData to JSON;.

Implements ModelView::JsonItemDataConverterInterface.

Definition at line 45 of file jsonitemdataconverter.cpp.

{
    QJsonArray result;
 
    for (const auto& x : data) {
        QJsonObject object;
        if (isRoleToJson(x.m_role)) {
            object[JsonItemFormatAssistant::roleKey] = x.m_role;
            object[JsonItemFormatAssistant::variantKey] = m_variant_converter->get_json(x.m_data);
            result.append(object);
        }
    }
 
    return result;
}

References isRoleToJson(), m_variant_converter, ModelView::JsonItemFormatAssistant::roleKey, and ModelView::JsonItemFormatAssistant::variantKey.

Referenced by TEST_F().

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Member Data Documentation

m_from_json_accept

accept_strategy_t ModelView::JsonItemDataConverter::m_from_json_accept

private

callback to find whether to read role from json

Definition at line 53 of file jsonitemdataconverter.h.

Referenced by isRoleFromJson().

m_to_json_accept

accept_strategy_t ModelView::JsonItemDataConverter::m_to_json_accept

private

callback to find whether to write role to json

Definition at line 52 of file jsonitemdataconverter.h.

Referenced by isRoleToJson().

m_variant_converter

std::unique_ptr<JsonVariantConverterInterface> ModelView::JsonItemDataConverter::m_variant_converter

private

Definition at line 54 of file jsonitemdataconverter.h.

Referenced by from_json(), and to_json().

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

• /home/www/ba/mvvm/model/mvvm/serialization/jsonitemdataconverter.h
• /home/www/ba/mvvm/model/mvvm/serialization/jsonitemdataconverter.cpp