Method ModifyAttribute

lib/base/configobject.cpp:92–211

};

void ConfigObject::ModifyAttribute(const String& attr, const Value& value, bool updateVersion)
{
	Dictionary::Ptr original_attributes = GetOriginalAttributes();
	bool updated_original_attributes = false;

	Type::Ptr type = GetReflectionType();

	std::vector<String> tokens = attr.Split(".");

	// This is reachable from ModifyObjectHandler. This check prevents API clients from creating deeply nested data
	// structures that could overflow the stack later on.
	if (tokens.size() > VarDepthLimit) {
		BOOST_THROW_EXCEPTION(std::invalid_argument("Attribute '" + attr + "' exceeds maximum nesting level of " +
			std::to_string(VarDepthLimit) + "."));
	}

	String fieldName = tokens[0];

	int fid = type->GetFieldId(fieldName);
	Field field = type->GetFieldInfo(fid);

	if (field.Attributes & FANoUserModify)
		BOOST_THROW_EXCEPTION(std::invalid_argument("Attribute cannot be modified."));

	if (field.Attributes & FAConfig) {
		if (!original_attributes) {
			original_attributes = new Dictionary();
			SetOriginalAttributes(original_attributes, true);
		}
	}

	Value oldValue = GetField(fid);
	Value newValue;

	if (tokens.size() > 1) {
		newValue = oldValue.Clone();
		Value current = newValue;

		if (current.IsEmpty()) {
			current = new Dictionary();
			newValue = current;
		}

		String prefix = tokens[0];

		for (std::vector<String>::size_type i = 1; i < tokens.size() - 1; i++) {
			if (!current.IsObjectType<Dictionary>())
				BOOST_THROW_EXCEPTION(std::invalid_argument("Value must be a dictionary."));

			Dictionary::Ptr dict = current;

			const String& key = tokens[i];
			prefix += "." + key;

			if (!dict->Get(key, &current)) {
				current = new Dictionary();
				dict->Set(key, current);
			}