typeRegistry.h

//
// Copyright 2023 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
 
#ifndef PXR_BASE_TS_TYPE_REGISTRY_H
#define PXR_BASE_TS_TYPE_REGISTRY_H
 
#include "pxr/pxr.h"
#include "pxr/base/tf/api.h"
#include "pxr/base/tf/hashmap.h"
#include "pxr/base/tf/registryManager.h"
#include "pxr/base/tf/singleton.h"
#include "pxr/base/ts/data.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class TsTypeRegistry {
    TsTypeRegistry(const TsTypeRegistry&) = delete;
    TsTypeRegistry& operator=(const TsTypeRegistry&) = delete;
 
public:
    TS_API
    static TsTypeRegistry& GetInstance() {
        return TfSingleton<TsTypeRegistry>::GetInstance();
    }
 
    typedef void(*TypedDataFactory)(
        Ts_PolymorphicDataHolder *holder,
        const VtValue &value);
 
    typedef TfHashMap<TfType,TypedDataFactory,TfHash> DataFactoryMap;
 
    template <class T>
    void RegisterTypedDataFactory(TypedDataFactory factory) {
        _dataFactoryMap[TfType::Find<T>()] = factory;
    }
 
    TS_API
    void InitializeDataHolder(
        Ts_PolymorphicDataHolder *holder,
        const VtValue &value);
 
    TS_API
    bool IsSupportedType(const TfType &type) const;
 
private:
    // Private constructor. Only TfSingleton may create one
    TsTypeRegistry();
    virtual ~TsTypeRegistry();
 
    friend class TfSingleton<TsTypeRegistry>;
 
    DataFactoryMap _dataFactoryMap;
};
 
#define TS_REGISTER_TYPE(TYPE)                                           \
TF_REGISTRY_FUNCTION(TsTypeRegistry) {                                   \
    TsTypeRegistry &reg = TsTypeRegistry::GetInstance();                 \
    reg.RegisterTypedDataFactory<TYPE>(                                  \
        [](Ts_PolymorphicDataHolder *holder, const VtValue &value) {     \
            holder->New(value.Get<TYPE>());                              \
        });                                                              \
}
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif