json.hpp

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/*
 * Copyright 2020 Robert Bosch GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <string>   // for string
#include <utility>  // for move
 
#include <fable/schema/interface.hpp>  // for Base<>
 
namespace fable::schema {
 
template <typename T>
class FromJson : public Base<FromJson<T>> {
 public:  // Types and Constructors
  using Type = T;
 
  FromJson(Type* ptr, JsonType t, std::string desc)
      : Base<FromJson<T>>(t, std::move(desc)), ptr_(ptr) {}
 
 public:  // Overrides
  [[nodiscard]] Json json_schema() const override {
    Json j{
        {"type", this->type_string()},
    };
    this->augment_schema(j);
    return j;
  }
 
  bool validate(const Conf& c, std::optional<SchemaError>& err) const override {
    return this->validate_type(c, err);
  }
 
  using Interface::to_json;
  void to_json(Json& j) const override {
    assert(ptr_ != nullptr);
    serialize_into(j, *ptr_);
  }
 
  void from_conf(const Conf& c) override {
    assert(ptr_ != nullptr);
    deserialize_into(c, *ptr_);
  }
 
  void reset_ptr() override { ptr_ = nullptr; }
 
  [[nodiscard]] Json serialize(const Type& x) const {
    return Json(x);
  }
 
  void serialize_into(Json& j, const Type& x) const {
    ::nlohmann::adl_serializer<Type>::to_json(j, x);
  }
 
  template<typename = std::enable_if<std::is_default_constructible_v<Type>>>
  [[nodiscard]] Type deserialize(const Conf& c) const {
    return c->get<Type>();
  }
 
  void deserialize_into(const Conf& c, Type& x) const {
    c->get_to(x);
  }
 
 private:
  Type* ptr_{nullptr};
};
 
template <typename T>
inline FromJson<T> make_schema(T* ptr, JsonType t, std::string desc) {
  return FromJson<T>(ptr, t, std::move(desc));
}
 
}  // namespace fable::schema