pyObjectFinder.h

//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_BASE_TF_PY_OBJECT_FINDER_H
#define PXR_BASE_TF_PY_OBJECT_FINDER_H

#include "pxr/pxr.h"

#include "pxr/base/tf/api.h"
#include "pxr/base/tf/pyIdentity.h"

#include <boost/python/handle.hpp>
#include <boost/python/object.hpp>

#include <typeinfo>

PXR_NAMESPACE_OPEN_SCOPE

struct Tf_PyObjectFinderBase {
    TF_API virtual ~Tf_PyObjectFinderBase();
    virtual boost::python::object Find(void const *objPtr) const = 0;
};

template <class T, class PtrType>
struct Tf_PyObjectFinder : public Tf_PyObjectFinderBase {
    virtual ~Tf_PyObjectFinder() {}
    virtual boost::python::object Find(void const *objPtr) const {
        using namespace boost::python;
        TfPyLock lock;
        void *p = const_cast<void *>(objPtr);
        PyObject *obj = Tf_PyGetPythonIdentity(PtrType(static_cast<T *>(p)));
        return obj ? object(handle<>(obj)) : object();
    }
};

TF_API
void Tf_RegisterPythonObjectFinderInternal(std::type_info const &type,
                                           Tf_PyObjectFinderBase const *finder);

template <class T, class PtrType>
void Tf_RegisterPythonObjectFinder() {
    Tf_RegisterPythonObjectFinderInternal(typeid(T),
                                          new Tf_PyObjectFinder<T, PtrType>());
}

TF_API boost::python::object
Tf_FindPythonObject(void const *objPtr, std::type_info const &type);

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_BASE_TF_PY_OBJECT_FINDER_H