optional<std::unique_ptr<Layer>> operator()(const V& value, Error& error) const {
if (!isObject(value)) {
error = { "layer must be an object" };
return {};
}
auto idValue = objectMember(value, "id");
if (!idValue) {
error = { "layer must have an id" };
return {};
}
optional<std::string> id = toString(*idValue);
if (!id) {
error = { "layer id must be a string" };
return {};
}
auto typeValue = objectMember(value, "type");
if (!typeValue) {
error = { "layer must have a type" };
return {};
}
optional<std::string> type = toString(*typeValue);
if (!type) {
error = { "layer type must be a string" };
return {};
}
optional<std::unique_ptr<Layer>> converted;
if (*type == "fill") {
converted = convertVectorLayer<FillLayer>(*id, value, error);
} else if (*type == "fill-extrusion") {
converted = convertVectorLayer<FillExtrusionLayer>(*id, value, error);
} else if (*type == "line") {
converted = convertVectorLayer<LineLayer>(*id, value, error);
} else if (*type == "circle") {
converted = convertVectorLayer<CircleLayer>(*id, value, error);
} else if (*type == "symbol") {
converted = convertVectorLayer<SymbolLayer>(*id, value, error);
} else if (*type == "raster") {
converted = convertRasterLayer(*id, value, error);
} else if (*type == "background") {
converted = convertBackgroundLayer(*id, value, error);
} else {
error = { "invalid layer type" };
return {};
}
if (!converted) {
return converted;
}
std::unique_ptr<Layer> layer = std::move(*converted);
auto minzoomValue = objectMember(value, "minzoom");
if (minzoomValue) {
optional<float> minzoom = toNumber(*minzoomValue);
if (!minzoom) {
error = { "minzoom must be numeric" };
return {};
}
layer->setMinZoom(*minzoom);
}
auto maxzoomValue = objectMember(value, "maxzoom");
if (maxzoomValue) {
optional<float> maxzoom = toNumber(*maxzoomValue);
if (!maxzoom) {
error = { "maxzoom must be numeric" };
return {};
}
layer->setMaxZoom(*maxzoom);
}
auto layoutValue = objectMember(value, "layout");
if (layoutValue) {
if (!isObject(*layoutValue)) {
error = { "layout must be an object" };
return {};
}
optional<Error> error_ = eachMember(*layoutValue, [&] (const std::string& k, const V& v) {
return setLayoutProperty(*layer, k, v);
});
if (error_) {
error = *error_;
return {};
}
}
optional<Error> error_ = setPaintProperties(*layer, value);
if (error_) {
error = *error_;
return {};
}
return std::move(layer);
}
optional<std::unique_ptr<Layer>> Converter<std::unique_ptr<Layer>>::operator()(const Convertible& value, Error& error) const {
if (!isObject(value)) {
error.message = "layer must be an object";
return nullopt;
}
auto idValue = objectMember(value, "id");
if (!idValue) {
error.message = "layer must have an id";
return nullopt;
}
optional<std::string> id = toString(*idValue);
if (!id) {
error.message = "layer id must be a string";
return nullopt;
}
auto typeValue = objectMember(value, "type");
if (!typeValue) {
error.message = "layer must have a type";
return nullopt;
}
optional<std::string> type = toString(*typeValue);
if (!type) {
error.message = "layer type must be a string";
return nullopt;
}
std::unique_ptr<Layer> layer = LayerManager::get()->createLayer(*type, *id, value, error);
if (!layer) {
return nullopt;
}
auto minzoomValue = objectMember(value, "minzoom");
if (minzoomValue) {
optional<float> minzoom = toNumber(*minzoomValue);
if (!minzoom) {
error.message = "minzoom must be numeric";
return nullopt;
}
layer->setMinZoom(*minzoom);
}
auto maxzoomValue = objectMember(value, "maxzoom");
if (maxzoomValue) {
optional<float> maxzoom = toNumber(*maxzoomValue);
if (!maxzoom) {
error.message = "maxzoom must be numeric";
return nullopt;
}
layer->setMaxZoom(*maxzoom);
}
auto layoutValue = objectMember(value, "layout");
if (layoutValue) {
if (!isObject(*layoutValue)) {
error.message = "layout must be an object";
return nullopt;
}
optional<Error> error_ = eachMember(*layoutValue, [&] (const std::string& k, const Convertible& v) {
return layer->setLayoutProperty(k, v);
});
if (error_) {
error = *error_;
return nullopt;
}
}
optional<Error> error_ = setPaintProperties(*layer, value);
if (error_) {
error = *error_;
return nullopt;
}
return std::move(layer);
}
