ObjectJsonHandler.h

#pragma once
 
#include <CesiumJsonReader/JsonHandler.h>
#include <CesiumJsonReader/Library.h>
#include <CesiumUtility/IntrusivePointer.h>
 
#include <optional>
 
namespace CesiumJsonReader {
class CESIUMJSONREADER_API ObjectJsonHandler : public JsonHandler {
public:
  ObjectJsonHandler() noexcept : JsonHandler() {}
 
  virtual IJsonHandler* readObjectStart() override /* final */;
  virtual IJsonHandler* readObjectEnd() override /* final */;
 
protected:
  virtual IJsonHandler* StartSubObject() noexcept;
  virtual IJsonHandler* EndSubObject() noexcept;
 
  template <typename TAccessor, typename TProperty>
  IJsonHandler*
  property(const char* currentKey, TAccessor& accessor, TProperty& value) {
    this->_currentKey = currentKey;
 
    if constexpr (isOptional<TProperty>::value) {
      value.emplace();
      accessor.reset(this, &value.value());
    } else if constexpr (isIntrusivePointer<TProperty>::value) {
      value.emplace();
      accessor.reset(this, value.get());
    } else {
      accessor.reset(this, &value);
    }
 
    return &accessor;
  }
 
  const char* getCurrentKey() const noexcept;
 
  virtual void reportWarning(
      const std::string& warning,
      std::vector<std::string>&& context = std::vector<std::string>()) override;
 
protected:
  void setCurrentKey(const char* key) noexcept;
 
private:
  template <typename T> struct isOptional {
    static constexpr bool value = false;
  };
 
  template <typename T> struct isOptional<std::optional<T>> {
    static constexpr bool value = true;
  };
 
  template <typename T> struct isIntrusivePointer {
    static constexpr bool value = false;
  };
 
  template <typename T>
  struct isIntrusivePointer<CesiumUtility::IntrusivePointer<T>> {
    static constexpr bool value = true;
  };
 
  int32_t _depth = 0;
  const char* _currentKey = nullptr;
};
} // namespace CesiumJsonReader