feat(cpp-object-oriented-modular-refactoring): step 12 - material-property-hierarchy

include/fesa/properties/shell_section.h

@@ -0,0 +1,57 @@
+#ifndef FESA_PROPERTIES_SHELL_SECTION_H_
+#define FESA_PROPERTIES_SHELL_SECTION_H_
+
+#include <string>
+
+#include "fesa/core/status.h"
+#include "fesa/properties/element_property.h"
+
+namespace fesa {
+
+/// @brief Stores a centered constant-thickness shell section assignment.
+class ShellSection final : public ElementProperty {
+ public:
+  /// @brief Creates a validated shell section.
+  /// @param thickness Positive thickness in the active consistent unit system.
+  /// @param material_index Stable Domain material collection position.
+  /// @return A section or a structured model failure.
+  static Result<ShellSection> Create(SourceEntityId source_id, std::string name,
+                                     double thickness,
+                                     EntityIndex material_index,
+                                     SourceLocation location);
+
+  /// @brief Constructs an already validated parser-owned shell record.
+  /// @note This compatibility seam preserves current consumers until Domain
+  /// polymorphic ownership is migrated.
+  ShellSection(std::string name, double thickness, EntityIndex material_index,
+               SourceLocation location);
+
+  ElementPropertyKind Kind() const noexcept override;
+  const SourceEntityId& SourceId() const noexcept override;
+  const SourceLocation& Location() const noexcept override;
+
+  /// @brief Returns the source shell-section name.
+  const std::string& Name() const noexcept;
+  /// @brief Returns centered shell thickness.
+  double Thickness() const noexcept;
+  /// @brief Returns the stable Domain material collection position.
+  EntityIndex MaterialIndex() const noexcept;
+
+  // Public storage preserves the current semantic-record API until Domain
+  // ownership migrates in the next approved Step.
+  std::string name;
+  double thickness;
+  EntityIndex material_index;
+  SourceLocation location;
+
+ private:
+  /// @brief Constructs a candidate whose fields have already been checked.
+  ShellSection(SourceEntityId source_id, std::string name, double thickness,
+               EntityIndex material_index, SourceLocation location);
+
+  SourceEntityId source_id_;
+};
+
+}  // namespace fesa
+
+#endif  // FESA_PROPERTIES_SHELL_SECTION_H_