SIM_DataUtils.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 */

#ifndef __SIM_DataUtils_h__
#define __SIM_DataUtils_h__

#include "SIM_Data.h"
#include "SIM_DataFactory.h"
#include "SIM_Utils.h"
#include <UT/UT_StringArray.h>
#include <UT/UT_StringHolder.h>
#include <SYS/SYS_Compiler.h>

/// This macro provides a quick way to define a static function called
/// classname() which returns the provided class name as a string.
#define DECLARE_CLASSNAME(DataClass, SuperClass) \
        private: \
            typedef SuperClass   BaseClass; \
            typedef DataClass    ThisClass; \
        public: \
            static inline const UT_StringHolder &classname() \
                                 { \
                                     static constexpr UT_StringLit theType(#DataClass); \
                                     return theType.asHolder(); \
                                 } \
        private: \
            const UT_StringHolder &getDataTypeSubclass() const override \
                                 { \
                                     return classname(); \
                                 } \
        protected: \
            static void     getDataTypeSuperclasses(UT_StringArray& classes) \
                            { \
                                static constexpr UT_StringLit theSuperType(#SuperClass); \
                                classes.append(theSuperType.asHolder()); \
                                SuperClass::getDataTypeSuperclasses(classes); \
                            } \
        private: \
        /**/

/// This function implements a standard version of getDistanceToType().
/// Only if your subclass uses multiple inheritance will it be necessary to
/// write a customized version of this function. Be sure to add this
/// declaration to your class definition or the DECLARE_DATAFACTORY()
/// macro will not compile properly.
#define DECLARE_STANDARD_GETCASTTOTYPE() \
        protected: \
            void        *getCastToType(const UT_StringRef &totype) const override \
                         { \
                             if( classname() == totype ) \
                                 return (void *)this; \
                             return BaseClass::getCastToType(totype); \
                         } \
        /**/

/// This macro simplifies the calling and casting the return value from
/// This macro quickly defines all the static functions needed to declare
/// a SIM_DataFactory for a SIM_Data subclass.
#define DECLARE_DATAFACTORY(DataClass, SuperClass, Description, DopParms) \
        public: \
            class DataClass##Factory : public SIM_DataFactory \
            { \
                public: \
                                 DataClass##Factory(SIM_Engine *engine) \
                                    : SIM_DataFactory(\
                                          SYS_CONCAT(#DataClass,_UTsh), \
                                          SYS_CONCAT(Description,_UTsh), \
                                          DataClass::getDataTypeSuperclasses, \
                                          DataClass::constructor, \
                                          DataClass::destructor, \
                                          DataClass::DopParms, \
                                          engine) \
                                 { } \
            }; \
            static void          createDataFactory(SIM_Engine *engine) \
                                 { \
                                     SIM_DataFactory    *factory; \
                                     factory = new DataClass##Factory( \
                                                   engine); \
                                     SIM_DataFactoryCreator::addDataFactory \
                                                   (engine, factory); \
                                 } \
            friend class         DataClass##Factory; \
        private: \
            DECLARE_CLASSNAME(DataClass, SuperClass); \
            static SIM_Data     *constructor(const SIM_DataFactory *factory) \
                                 { return (BaseClass *)new \
                                          DataClass(factory); } \
            static void          destructor(SIM_Data *data) \
                                 { delete (DataClass *)data-> \
                                          getPointerToType(#DataClass); } \
        /**/

/// Add this macro to the initialization function for your library. It uses
/// the declaration above to register your data type.
#define IMPLEMENT_DATAFACTORY(DataClass) \
        static SIM_DataFactoryCreator \
               DataClass##Creator(DataClass::createDataFactory);

#endif