assimp.assimp/code/AssetLib/FBX/FBXProperties.h

/*
Open Asset Import Library (assimp)
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  following disclaimer.

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*/

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

#include "FBXCompileConfig.h"
#include <memory>
#include <string>

namespace Assimp {
namespace FBX {

// 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;
};


typedef std::fbx_unordered_map<std::string,std::shared_ptr<Property> > DirectPropertyMap;
typedef std::fbx_unordered_map<std::string,const Property*>            PropertyMap;
typedef std::fbx_unordered_map<std::string,const Element*>             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 Element& element, std::shared_ptr<const PropertyTable> templateProps);
    ~PropertyTable();

    const Property* Get(const std::string& name) const;

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

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

    DirectPropertyMap GetUnparsedProperties() const;

private:
    LazyPropertyMap lazyProps;
    mutable PropertyMap props;
    const std::shared_ptr<const PropertyTable> templateProps;
    const Element* const element;
};

// ------------------------------------------------------------------------------------------------
template <typename T>
inline 
T PropertyGet(const PropertyTable& in, const std::string& name, const T& defaultValue) {
    const Property* const 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 ) {
    const Property* 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();
}

} //! FBX
} //! Assimp

#endif // INCLUDED_AI_FBX_PROPERTIES_H