PropertyView.h

#pragma once
 
#include "CesiumGltf/ClassProperty.h"
#include "CesiumGltf/PropertyAttributeProperty.h"
#include "CesiumGltf/PropertyTableProperty.h"
#include "CesiumGltf/PropertyTextureProperty.h"
#include "CesiumGltf/PropertyTypeTraits.h"
 
#include <cstring>
#include <optional>
 
namespace CesiumGltf {
 
typedef int32_t PropertyViewStatusType;
 
class PropertyViewStatus {
public:
  static const PropertyViewStatusType Valid = 0;
 
  static const PropertyViewStatusType EmptyPropertyWithDefault = 1;
 
  static const PropertyViewStatusType ErrorNonexistentProperty = 2;
 
  static const PropertyViewStatusType ErrorTypeMismatch = 3;
 
  static const PropertyViewStatusType ErrorComponentTypeMismatch = 4;
 
  static const PropertyViewStatusType ErrorArrayTypeMismatch = 5;
 
  static const PropertyViewStatusType ErrorInvalidNormalization = 6;
 
  static const PropertyViewStatusType ErrorNormalizationMismatch = 7;
 
  static const PropertyViewStatusType ErrorInvalidOffset = 8;
 
  static const PropertyViewStatusType ErrorInvalidScale = 9;
 
  static const PropertyViewStatusType ErrorInvalidMax = 10;
 
  static const PropertyViewStatusType ErrorInvalidMin = 11;
 
  static const PropertyViewStatusType ErrorInvalidNoDataValue = 12;
 
  static const PropertyViewStatusType ErrorInvalidDefaultValue = 13;
};
 
template <typename T>
PropertyViewStatusType
validatePropertyType(const ClassProperty& classProperty) {
  if (TypeToPropertyType<T>::value !=
      convertStringToPropertyType(classProperty.type)) {
    return PropertyViewStatus::ErrorTypeMismatch;
  }
 
  PropertyComponentType expectedComponentType =
      TypeToPropertyType<T>::component;
 
  if (!classProperty.componentType &&
      expectedComponentType != PropertyComponentType::None) {
    return PropertyViewStatus::ErrorComponentTypeMismatch;
  }
 
  if (classProperty.componentType &&
      expectedComponentType !=
          convertStringToPropertyComponentType(*classProperty.componentType)) {
    return PropertyViewStatus::ErrorComponentTypeMismatch;
  }
 
  if (classProperty.array) {
    return PropertyViewStatus::ErrorArrayTypeMismatch;
  }
 
  return PropertyViewStatus::Valid;
}
 
template <typename T>
PropertyViewStatusType
validateArrayPropertyType(const ClassProperty& classProperty) {
  using ElementType = typename MetadataArrayType<T>::type;
  if (TypeToPropertyType<ElementType>::value !=
      convertStringToPropertyType(classProperty.type)) {
    return PropertyViewStatus::ErrorTypeMismatch;
  }
 
  PropertyComponentType expectedComponentType =
      TypeToPropertyType<ElementType>::component;
 
  if (!classProperty.componentType &&
      expectedComponentType != PropertyComponentType::None) {
    return PropertyViewStatus::ErrorComponentTypeMismatch;
  }
 
  if (classProperty.componentType &&
      expectedComponentType !=
          convertStringToPropertyComponentType(*classProperty.componentType)) {
    return PropertyViewStatus::ErrorComponentTypeMismatch;
  }
 
  if (!classProperty.array) {
    return PropertyViewStatus::ErrorArrayTypeMismatch;
  }
 
  return PropertyViewStatus::Valid;
}
 
template <typename T>
static std::optional<T> getScalar(const CesiumUtility::JsonValue& jsonValue) {
  try {
    return jsonValue.getSafeNumber<T>();
  } catch (const CesiumUtility::JsonValueNotRealValue& /*error*/) {
    return std::nullopt;
  } catch (const gsl::narrowing_error& /*error*/) {
    return std::nullopt;
  }
}
 
template <typename VecType>
static std::optional<VecType>
getVecN(const CesiumUtility::JsonValue& jsonValue) {
  if (!jsonValue.isArray()) {
    return std::nullopt;
  }
 
  const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
  constexpr glm::length_t N = VecType::length();
  if (array.size() != N) {
    return std::nullopt;
  }
 
  using T = typename VecType::value_type;
 
  VecType result;
  for (glm::length_t i = 0; i < N; i++) {
    std::optional<T> value = getScalar<T>(array[i]);
    if (!value) {
      return std::nullopt;
    }
 
    result[i] = *value;
  }
 
  return result;
}
 
template <typename MatType>
static std::optional<MatType>
getMatN(const CesiumUtility::JsonValue& jsonValue) {
  if (!jsonValue.isArray()) {
    return std::nullopt;
  }
 
  const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
  constexpr glm::length_t N = MatType::length();
  if (array.size() != N * N) {
    return std::nullopt;
  }
 
  using T = typename MatType::value_type;
 
  MatType result;
  for (glm::length_t i = 0; i < N; i++) {
    // Try to parse each value in the column.
    for (glm::length_t j = 0; j < N; j++) {
      std::optional<T> value = getScalar<T>(array[i * N + j]);
      if (!value) {
        return std::nullopt;
      }
 
      result[i][j] = *value;
    }
  }
 
  return result;
}
 
template <typename ElementType>
int64_t getCount(std::optional<std::vector<std::byte>>& buffer) {
  if (!buffer) {
    return 0;
  }
 
  return static_cast<int64_t>(buffer->size() / sizeof(ElementType));
}
 
template <typename ElementType, bool Normalized = false> class PropertyView;
 
template <typename ElementType> class PropertyView<ElementType, false> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<ElementType>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        // "noData" can only be defined if the property is not required.
        _noData = getValue(*classProperty.noData);
      }
 
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        // "default" can only be defined if the property is not required.
        _defaultValue = getValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyAttributeProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return 0; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<ElementType> offset() const noexcept { return _offset; }
 
  std::optional<ElementType> scale() const noexcept { return _scale; }
 
  std::optional<ElementType> max() const noexcept { return _max; }
 
  std::optional<ElementType> min() const noexcept { return _min; }
 
  bool required() const noexcept { return _required; }
 
  std::optional<ElementType> noData() const noexcept { return _noData; }
 
  std::optional<ElementType> defaultValue() const noexcept {
    return _defaultValue;
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  std::optional<ElementType> _offset;
  std::optional<ElementType> _scale;
  std::optional<ElementType> _max;
  std::optional<ElementType> _min;
 
  bool _required;
  std::optional<ElementType> _noData;
  std::optional<ElementType> _defaultValue;
 
  static std::optional<ElementType>
  getValue(const CesiumUtility::JsonValue& jsonValue) {
    if constexpr (IsMetadataScalar<ElementType>::value) {
      return getScalar<ElementType>(jsonValue);
    }
 
    if constexpr (IsMetadataVecN<ElementType>::value) {
      return getVecN<ElementType>(jsonValue);
    }
 
    if constexpr (IsMetadataMatN<ElementType>::value) {
      return getMatN<ElementType>(jsonValue);
    }
  }
 
  using PropertyDefinitionType = std::variant<
      ClassProperty,
      PropertyTableProperty,
      PropertyTextureProperty,
      PropertyAttributeProperty>;
 
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            // Only floating point types can specify an offset.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              this->_offset = getValue(*property.offset);
              if (this->_offset) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            // Only floating point types can specify a scale.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              this->_scale = getValue(*property.scale);
              if (this->_scale) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            this->_max = getValue(*property.max);
            if (!this->_max) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            this->_min = getValue(*property.min);
            if (!this->_min) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
};
 
template <typename ElementType> class PropertyView<ElementType, true> {
private:
  using NormalizedType = typename TypeToNormalizedType<ElementType>::type;
 
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<ElementType>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (!classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        // "noData" should not be defined if the property is required.
        _noData = getValue<ElementType>(*classProperty.noData);
      }
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      // default value should not be defined if the property is required.
      if (!_required) {
        _defaultValue =
            getValue<NormalizedType>(*classProperty.defaultProperty);
      }
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyAttributeProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return 0; }
 
  bool normalized() const noexcept { return true; }
 
  std::optional<NormalizedType> offset() const noexcept { return _offset; }
 
  std::optional<NormalizedType> scale() const noexcept { return _scale; }
 
  std::optional<NormalizedType> max() const noexcept { return _max; }
 
  std::optional<NormalizedType> min() const noexcept { return _min; }
 
  bool required() const noexcept { return _required; }
 
  std::optional<ElementType> noData() const noexcept { return _noData; }
 
  std::optional<NormalizedType> defaultValue() const noexcept {
    return _defaultValue;
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  std::optional<NormalizedType> _offset;
  std::optional<NormalizedType> _scale;
  std::optional<NormalizedType> _max;
  std::optional<NormalizedType> _min;
 
  bool _required;
  std::optional<ElementType> _noData;
  std::optional<NormalizedType> _defaultValue;
 
  template <typename T>
  static std::optional<T> getValue(const CesiumUtility::JsonValue& jsonValue) {
    if constexpr (IsMetadataScalar<T>::value) {
      return getScalar<T>(jsonValue);
    }
 
    if constexpr (IsMetadataVecN<T>::value) {
      return getVecN<T>(jsonValue);
    }
 
    if constexpr (IsMetadataMatN<T>::value) {
      return getMatN<T>(jsonValue);
    }
  }
 
  using PropertyDefinitionType = std::variant<
      ClassProperty,
      PropertyTableProperty,
      PropertyTextureProperty,
      PropertyAttributeProperty>;
 
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            _offset = getValue<NormalizedType>(*property.offset);
            if (!_offset) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            _scale = getValue<NormalizedType>(*property.scale);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            _max = getValue<NormalizedType>(*property.max);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            _min = getValue<NormalizedType>(*property.min);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
};
 
template <> class PropertyView<bool> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<bool>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _required(classProperty.required),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getBooleanValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return 0; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<bool> offset() const noexcept { return std::nullopt; }
 
  std::optional<bool> scale() const noexcept { return std::nullopt; }
 
  std::optional<bool> max() const noexcept { return std::nullopt; }
 
  std::optional<bool> min() const noexcept { return std::nullopt; }
 
  bool required() const noexcept { return _required; }
 
  std::optional<bool> noData() const noexcept { return std::nullopt; }
 
  std::optional<bool> defaultValue() const noexcept { return _defaultValue; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  bool _required;
  std::optional<bool> _defaultValue;
 
  static std::optional<bool>
  getBooleanValue(const CesiumUtility::JsonValue& value) {
    if (!value.isBool()) {
      return std::nullopt;
    }
 
    return value.getBool();
  }
};
 
template <> class PropertyView<std::string_view> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<std::string_view>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        _noData = getStringValue(*classProperty.noData);
      }
 
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getStringValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return 0; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<std::string_view> offset() const noexcept {
    return std::nullopt;
  }
 
  std::optional<std::string_view> scale() const noexcept {
    return std::nullopt;
  }
 
  std::optional<std::string_view> max() const noexcept { return std::nullopt; }
 
  std::optional<std::string_view> min() const noexcept { return std::nullopt; }
 
  bool required() const noexcept { return _required; }
 
  std::optional<std::string_view> noData() const noexcept {
    if (_noData)
      return std::string_view(*_noData);
 
    return std::nullopt;
  }
 
  std::optional<std::string_view> defaultValue() const noexcept {
    if (_defaultValue)
      return std::string_view(*_defaultValue);
 
    return std::nullopt;
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  bool _required;
  std::optional<std::string> _noData;
  std::optional<std::string> _defaultValue;
 
  static std::optional<std::string>
  getStringValue(const CesiumUtility::JsonValue& value) {
    if (!value.isString()) {
      return std::nullopt;
    }
 
    return std::string(value.getString().c_str());
  }
};
 
template <typename ElementType>
class PropertyView<PropertyArrayView<ElementType>, false> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validateArrayPropertyType<PropertyArrayView<ElementType>>(
            classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(_count = classProperty.count ? *classProperty.count : 0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        _noData = getArrayValue(*classProperty.noData);
      }
 
      if (!_noData) {
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getArrayValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return _count; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<PropertyArrayView<ElementType>> offset() const noexcept {
    if (!_offset) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_offset->data(), _offset->size()));
  }
 
  std::optional<PropertyArrayView<ElementType>> scale() const noexcept {
    if (!_scale) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_scale->data(), _scale->size()));
  }
 
  std::optional<PropertyArrayView<ElementType>> max() const noexcept {
    if (!_max) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_max->data(), _max->size()));
  }
 
  std::optional<PropertyArrayView<ElementType>> min() const noexcept {
    if (!_min) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_min->data(), _min->size()));
  }
 
  bool required() const noexcept { return _required; }
 
  std::optional<PropertyArrayView<ElementType>> noData() const noexcept {
    if (!_noData) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_noData->data(), _noData->size()));
  }
 
  std::optional<PropertyArrayView<ElementType>> defaultValue() const noexcept {
    if (!_defaultValue) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(gsl::span<const std::byte>(
        _defaultValue->data(),
        _defaultValue->size()));
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
 
  std::optional<std::vector<std::byte>> _offset;
  std::optional<std::vector<std::byte>> _scale;
  std::optional<std::vector<std::byte>> _max;
  std::optional<std::vector<std::byte>> _min;
 
  bool _required;
  std::optional<std::vector<std::byte>> _noData;
  std::optional<std::vector<std::byte>> _defaultValue;
 
  using PropertyDefinitionType = std::
      variant<ClassProperty, PropertyTableProperty, PropertyTextureProperty>;
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            // Only floating point types can specify an offset.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              if (this->_count > 0) {
                this->_offset = getArrayValue(*property.offset);
              }
              if (this->_offset &&
                  getCount<ElementType>(this->_offset) == this->_count) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            // Only floating point types can specify a scale.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              if (_count > 0) {
                this->_scale = getArrayValue(*property.scale);
              }
              if (this->_scale &&
                  getCount<ElementType>(this->_scale) == this->_count) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            if (this->_count > 0) {
              this->_max = getArrayValue(*property.max);
            }
            if (!this->_max ||
                getCount<ElementType>(this->_max) != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            if (this->_count > 0) {
              this->_min = getArrayValue(*property.min);
            }
            if (!this->_min ||
                getCount<ElementType>(this->_min) != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
 
  static std::optional<std::vector<std::byte>>
  getArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return std::nullopt;
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<ElementType> values;
    values.reserve(array.size());
 
    if constexpr (IsMetadataScalar<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> element = getScalar<ElementType>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
    if constexpr (IsMetadataVecN<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> element = getVecN<ElementType>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
 
    if constexpr (IsMetadataMatN<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> element = getMatN<ElementType>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
 
    std::vector<std::byte> result(values.size() * sizeof(ElementType));
    std::memcpy(result.data(), values.data(), result.size());
 
    return result;
  }
};
 
template <typename ElementType>
class PropertyView<PropertyArrayView<ElementType>, true> {
private:
  using NormalizedType = typename TypeToNormalizedType<ElementType>::type;
 
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validateArrayPropertyType<PropertyArrayView<ElementType>>(
            classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(_count = classProperty.count ? *classProperty.count : 0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (!classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        _noData = getArrayValue<ElementType>(*classProperty.noData);
      }
 
      if (!_noData) {
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue =
            getArrayValue<NormalizedType>(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return _count; }
 
  bool normalized() const noexcept { return true; }
 
  std::optional<PropertyArrayView<NormalizedType>> offset() const noexcept {
    if (!_offset) {
      return std::nullopt;
    }
 
    return PropertyArrayView<NormalizedType>(
        gsl::span<const std::byte>(_offset->data(), _offset->size()));
  }
 
  std::optional<PropertyArrayView<NormalizedType>> scale() const noexcept {
    if (!_scale) {
      return std::nullopt;
    }
 
    return PropertyArrayView<NormalizedType>(
        gsl::span<const std::byte>(_scale->data(), _scale->size()));
  }
 
  std::optional<PropertyArrayView<NormalizedType>> max() const noexcept {
    if (!_max) {
      return std::nullopt;
    }
 
    return PropertyArrayView<NormalizedType>(
        gsl::span<const std::byte>(_max->data(), _max->size()));
  }
 
  std::optional<PropertyArrayView<NormalizedType>> min() const noexcept {
    if (!_min) {
      return std::nullopt;
    }
 
    return PropertyArrayView<NormalizedType>(
        gsl::span<const std::byte>(_min->data(), _min->size()));
  }
 
  bool required() const noexcept { return _required; }
 
  std::optional<PropertyArrayView<ElementType>> noData() const noexcept {
    if (!_noData) {
      return std::nullopt;
    }
 
    return PropertyArrayView<ElementType>(
        gsl::span<const std::byte>(_noData->data(), _noData->size()));
  }
 
  std::optional<PropertyArrayView<NormalizedType>>
  defaultValue() const noexcept {
    if (!_defaultValue) {
      return std::nullopt;
    }
 
    return PropertyArrayView<NormalizedType>(gsl::span<const std::byte>(
        _defaultValue->data(),
        _defaultValue->size()));
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
 
  std::optional<std::vector<std::byte>> _offset;
  std::optional<std::vector<std::byte>> _scale;
  std::optional<std::vector<std::byte>> _max;
  std::optional<std::vector<std::byte>> _min;
 
  bool _required;
  std::optional<std::vector<std::byte>> _noData;
  std::optional<std::vector<std::byte>> _defaultValue;
 
  using PropertyDefinitionType = std::
      variant<ClassProperty, PropertyTableProperty, PropertyTextureProperty>;
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            if (_count > 0) {
              _offset = getArrayValue<NormalizedType>(*property.offset);
            }
            if (!_offset || getCount<NormalizedType>(_offset) != _count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            if (_count > 0) {
              _scale = getArrayValue<NormalizedType>(*property.scale);
            }
            if (!_scale || getCount<NormalizedType>(_scale) != _count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            if (_count > 0) {
              _max = getArrayValue<NormalizedType>(*property.max);
            }
            if (!_max || getCount<NormalizedType>(_max) != _count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            if (_count > 0) {
              _min = getArrayValue<NormalizedType>(*property.min);
            }
            if (!_min || getCount<NormalizedType>(_min) != _count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
 
  template <typename T>
  static std::optional<std::vector<std::byte>>
  getArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return std::nullopt;
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<T> values;
    values.reserve(array.size());
 
    if constexpr (IsMetadataScalar<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> element = getScalar<T>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
 
    if constexpr (IsMetadataVecN<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> element = getVecN<T>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
 
    if constexpr (IsMetadataMatN<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> element = getMatN<T>(array[i]);
        if (!element) {
          return std::nullopt;
        }
 
        values.push_back(*element);
      }
    }
 
    std::vector<std::byte> result(values.size() * sizeof(T));
    std::memcpy(result.data(), values.data(), result.size());
 
    return result;
  }
};
 
template <> class PropertyView<PropertyArrayView<bool>> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _defaultValue(),
        _size(0) {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(
            validateArrayPropertyType<PropertyArrayView<bool>>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _required(classProperty.required),
        _defaultValue(),
        _size(0) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue =
            getBooleanArrayValue(*classProperty.defaultProperty, _size);
      }
 
      if (_size == 0 || (_count > 0 && _size != _count)) {
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _defaultValue(),
        _size(0) {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return _count; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<PropertyArrayView<bool>> offset() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<bool>> scale() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<bool>> max() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<bool>> min() const noexcept {
    return std::nullopt;
  }
 
  bool required() const noexcept { return _required; }
 
  std::optional<PropertyArrayView<bool>> noData() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<bool>> defaultValue() const noexcept {
    if (_size > 0) {
      return PropertyArrayView<bool>(
          gsl::span<const std::byte>(
              _defaultValue.data(),
              _defaultValue.size()),
          /* bitOffset = */ 0,
          _size);
    }
 
    return std::nullopt;
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
  bool _required;
 
  std::vector<std::byte> _defaultValue;
  int64_t _size;
 
  static std::vector<std::byte> getBooleanArrayValue(
      const CesiumUtility::JsonValue& jsonValue,
      int64_t& size) {
    if (!jsonValue.isArray()) {
      return std::vector<std::byte>();
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<std::byte> values;
    values.reserve((array.size() / 8) + 1);
 
    size_t byteIndex = 0;
    uint8_t bitIndex = 0;
 
    for (size_t i = 0; i < array.size(); i++, size++) {
      if (!array[i].isBool()) {
        size = 0;
        return values;
      }
 
      if (values.size() < byteIndex - 1) {
        values.push_back(std::byte(0));
      }
 
      std::byte value = std::byte(array[i].getBool() ? 1 : 0);
      value = value << bitIndex;
 
      values[byteIndex] |= value;
 
      bitIndex++;
      if (bitIndex > 7) {
        byteIndex++;
        bitIndex = 0;
      }
    }
 
    return values;
  }
};
 
template <> class PropertyView<PropertyArrayView<std::string_view>> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _noData(),
        _defaultValue() {}
 
  PropertyView(const ClassProperty& classProperty)
      : _status(validateArrayPropertyType<PropertyArrayView<std::string_view>>(
            classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _required(classProperty.required),
        _noData(),
        _defaultValue() {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        _noData = getStringArrayValue(*classProperty.noData);
      }
 
      if (_noData.size == 0 || (_count > 0 && _noData.size != _count)) {
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getStringArrayValue(*classProperty.defaultProperty);
      }
 
      if (_defaultValue.size == 0 ||
          (_count > 0 && _defaultValue.size != _count)) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _noData(),
        _defaultValue() {}
 
  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }
 
  const std::optional<std::string>& name() const noexcept { return _name; }
 
  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }
 
  const std::optional<std::string>& description() const noexcept {
    return _description;
  }
 
  int64_t arrayCount() const noexcept { return _count; }
 
  bool normalized() const noexcept { return false; }
 
  std::optional<PropertyArrayView<std::string_view>> offset() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<std::string_view>> scale() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<std::string_view>> max() const noexcept {
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<std::string_view>> min() const noexcept {
    return std::nullopt;
  }
 
  bool required() const noexcept { return _required; }
 
  std::optional<PropertyArrayView<std::string_view>> noData() const noexcept {
    if (_noData.size > 0) {
      return PropertyArrayView<std::string_view>(
          gsl::span<const std::byte>(_noData.data.data(), _noData.data.size()),
          gsl::span<const std::byte>(
              _noData.offsets.data(),
              _noData.offsets.size()),
          _noData.offsetType,
          _noData.size);
    }
 
    return std::nullopt;
  }
 
  std::optional<PropertyArrayView<std::string_view>>
  defaultValue() const noexcept {
    if (_defaultValue.size > 0) {
      return PropertyArrayView<std::string_view>(
          gsl::span<const std::byte>(
              _defaultValue.data.data(),
              _defaultValue.data.size()),
          gsl::span<const std::byte>(
              _defaultValue.offsets.data(),
              _defaultValue.offsets.size()),
          _defaultValue.offsetType,
          _defaultValue.size);
    }
 
    return std::nullopt;
  }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
  bool _required;
 
  struct StringArrayValue {
    std::vector<std::byte> data;
    std::vector<std::byte> offsets;
    PropertyComponentType offsetType = PropertyComponentType::None;
    int64_t size = 0;
  };
 
  StringArrayValue _noData;
  StringArrayValue _defaultValue;
 
  static StringArrayValue
  getStringArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    StringArrayValue result;
    if (!jsonValue.isArray()) {
      return result;
    }
 
    std::vector<std::string> strings;
    std::vector<uint64_t> stringOffsets;
 
    const auto array = jsonValue.getArray();
    strings.reserve(array.size());
    stringOffsets.reserve(array.size() + 1);
    stringOffsets.push_back(static_cast<uint64_t>(0));
 
    for (size_t i = 0; i < array.size(); i++) {
      if (!array[i].isString()) {
        // The entire array is invalidated; return.
        return result;
      }
 
      const std::string& string = array[i].getString();
      strings.push_back(string);
      stringOffsets.push_back(stringOffsets[i] + string.size());
    }
 
    uint64_t totalLength = stringOffsets.back();
    result.data.resize(totalLength);
    for (size_t i = 0; i < strings.size(); ++i) {
      std::memcpy(
          result.data.data() + stringOffsets[i],
          strings[i].data(),
          strings[i].size());
    };
 
    if (totalLength <= std::numeric_limits<uint8_t>::max()) {
      result.offsets = narrowOffsetsBuffer<uint8_t>(stringOffsets);
      result.offsetType = PropertyComponentType::Uint8;
    } else if (totalLength <= std::numeric_limits<uint16_t>::max()) {
      result.offsets = narrowOffsetsBuffer<uint16_t>(stringOffsets);
      result.offsetType = PropertyComponentType::Uint16;
    } else if (totalLength <= std::numeric_limits<uint32_t>::max()) {
      result.offsets = narrowOffsetsBuffer<uint32_t>(stringOffsets);
      result.offsetType = PropertyComponentType::Uint32;
    } else {
      result.offsets.resize(stringOffsets.size() * sizeof(uint64_t));
      std::memcpy(
          result.offsets.data(),
          stringOffsets.data(),
          result.offsets.size());
      result.offsetType = PropertyComponentType::Uint64;
    }
 
    result.size = static_cast<int64_t>(strings.size());
 
    return result;
  }
 
  template <typename T>
  static std::vector<std::byte>
  narrowOffsetsBuffer(std::vector<uint64_t> offsets) {
    std::vector<std::byte> result(offsets.size() * sizeof(T));
    size_t bufferOffset = 0;
    for (size_t i = 0; i < offsets.size(); i++, bufferOffset += sizeof(T)) {
      T offset = static_cast<T>(offsets[i]);
      std::memcpy(result.data() + bufferOffset, &offset, sizeof(T));
    }
 
    return result;
  }
};
 
} // namespace CesiumGltf