godot/modules/fbx/fbx_parser/FBXProperties.h

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/*  FBXProperties.h                                                      */
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/** @file  FBXProperties.h
 *  @brief FBX dynamic properties
 */
#ifndef FBX_PROPERTIES_H
#define FBX_PROPERTIES_H

#include "FBXParser.h"
#include <map>
#include <memory>
#include <string>
#include <vector>

namespace FBXDocParser {

// Forward declarations
class Element;

/** Represents a dynamic property. Type info added by deriving classes,
 *  see #TypedProperty.
 Example:
 @verbatim
   P: "ShininessExponent", "double", "Number", "",0.5
 @endvebatim
*/
class Property {
protected:
	Property();

public:
	virtual ~Property();

public:
	template <typename T>
	const T *As() const {
		return dynamic_cast<const T *>(this);
	}
};

template <typename T>
class TypedProperty : public Property {
public:
	explicit TypedProperty(const T &value) :
			value(value) {
		// empty
	}

	const T &Value() const {
		return value;
	}

private:
	T value;
};

#define new_Property new Property
typedef Property *PropertyPtr;
typedef std::map<std::string, PropertyPtr> DirectPropertyMap;
typedef std::map<std::string, PropertyPtr> PropertyMap;
typedef std::map<std::string, ElementPtr> LazyPropertyMap;

/**
 *  Represents a property table as can be found in the newer FBX files (Properties60, Properties70)
 */
class PropertyTable {
public:
	// in-memory property table with no source element
	PropertyTable();
	PropertyTable(const PropertyTable *templateProps);
	PropertyTable(const ElementPtr element, const PropertyTable *templateProps);
	~PropertyTable();

	PropertyPtr Get(const std::string &name) const;

	// PropertyTable's need not be coupled with FBX elements so this can be NULL
	ElementPtr GetElement() const {
		return element;
	}

	const PropertyMap &GetProperties() const {
		return props;
	}

	const LazyPropertyMap &GetLazyProperties() const {
		return lazyProps;
	}

	const PropertyTable *TemplateProps() const {
		return templateProps;
	}

	DirectPropertyMap GetUnparsedProperties() const;

private:
	LazyPropertyMap lazyProps;
	mutable PropertyMap props;
	const PropertyTable *templateProps = nullptr;
	const ElementPtr element = nullptr;
};

// ------------------------------------------------------------------------------------------------
template <typename T>
inline T PropertyGet(const PropertyTable *in, const std::string &name, const T &defaultValue) {
	PropertyPtr prop = in->Get(name);
	if (nullptr == prop) {
		return defaultValue;
	}

	// strong typing, no need to be lenient
	const TypedProperty<T> *const tprop = prop->As<TypedProperty<T>>();
	if (nullptr == tprop) {
		return defaultValue;
	}

	return tprop->Value();
}

// ------------------------------------------------------------------------------------------------
template <typename T>
inline T PropertyGet(const PropertyTable *in, const std::string &name, bool &result, bool useTemplate = false) {
	PropertyPtr prop = in->Get(name);
	if (nullptr == prop) {
		if (!useTemplate) {
			result = false;
			return T();
		}
		const PropertyTable *templ = in->TemplateProps();
		if (nullptr == templ) {
			result = false;
			return T();
		}
		prop = templ->Get(name);
		if (nullptr == prop) {
			result = false;
			return T();
		}
	}

	// strong typing, no need to be lenient
	const TypedProperty<T> *const tprop = prop->As<TypedProperty<T>>();
	if (nullptr == tprop) {
		result = false;
		return T();
	}

	result = true;
	return tprop->Value();
}

} // namespace FBXDocParser

#endif // FBX_PROPERTIES_H