102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
#pragma once
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#include "JsonHandler.h"
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#include "Library.h"
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#include <CesiumUtility/IntrusivePointer.h>
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#include <optional>
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namespace CesiumJsonReader {
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/**
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* @brief \ref IJsonHandler for handling JSON objects.
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*/
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class CESIUMJSONREADER_API ObjectJsonHandler : public JsonHandler {
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public:
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ObjectJsonHandler() noexcept : JsonHandler() {}
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/** @copydoc IJsonHandler::readObjectStart */
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virtual IJsonHandler* readObjectStart() override /* final */;
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/** @copydoc IJsonHandler::readObjectEnd */
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virtual IJsonHandler* readObjectEnd() override /* final */;
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protected:
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/**
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* @brief Called when \ref readObjectStart is called when the depth of the
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* \ref ObjectJsonHandler is greater than 0.
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*/
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virtual IJsonHandler* StartSubObject() noexcept;
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/**
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* @brief Called when \ref readObjectEnd is called when the depth of the
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* \ref ObjectJsonHandler is greater than 0.
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*/
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virtual IJsonHandler* EndSubObject() noexcept;
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/**
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* @brief Called from \ref IJsonHandler::readObjectKey to read a property into
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* an object.
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*
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* @param currentKey The key that's currently being read.
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* @param accessor An \ref IJsonHandler that can read the type of this
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* property.
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* @param value A reference to the location to store the read value.
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* @returns The `accessor` \ref IJsonHandler that will read the next token
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* into `value`.
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*/
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template <typename TAccessor, typename TProperty>
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IJsonHandler*
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property(const char* currentKey, TAccessor& accessor, TProperty& value) {
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this->_currentKey = currentKey;
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if constexpr (isOptional<TProperty>::value) {
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value.emplace();
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accessor.reset(this, &value.value());
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} else if constexpr (isIntrusivePointer<TProperty>::value) {
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value.emplace();
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accessor.reset(this, value.get());
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} else {
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accessor.reset(this, &value);
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}
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return &accessor;
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}
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/**
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* @brief Obtains the most recent key handled by this JsonHandler.
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*/
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const char* getCurrentKey() const noexcept;
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/** @copydoc IJsonHandler::reportWarning */
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virtual void reportWarning(
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const std::string& warning,
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std::vector<std::string>&& context = std::vector<std::string>()) override;
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protected:
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/**
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* @brief Sets the most recent key handled by this JsonHandler.
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*/
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void setCurrentKey(const char* key) noexcept;
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private:
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template <typename T> struct isOptional {
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static constexpr bool value = false;
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};
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template <typename T> struct isOptional<std::optional<T>> {
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static constexpr bool value = true;
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};
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template <typename T> struct isIntrusivePointer {
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static constexpr bool value = false;
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};
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template <typename T>
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struct isIntrusivePointer<CesiumUtility::IntrusivePointer<T>> {
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static constexpr bool value = true;
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};
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int32_t _depth = 0;
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const char* _currentKey = nullptr;
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};
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} // namespace CesiumJsonReader
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