pluginEntry.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 HF_PLUGIN_ENTRY_H
#define HF_PLUGIN_ENTRY_H

#include "pxr/pxr.h"
#include "pxr/base/tf/token.h"
#include "pxr/base/tf/type.h"
#include "pxr/imaging/hf/perfLog.h"
#include <string>
#include <functional>

PXR_NAMESPACE_OPEN_SCOPE

class HfPluginBase;
struct HfPluginDesc;



class Hf_PluginEntry final {
public:
    HF_MALLOC_TAG_NEW("new Hf_PluginEntry");

    typedef std::function<HfPluginBase *()> _PluginFactoryFn;

    Hf_PluginEntry(const TfType &type,
                   const std::string &displayName,
                   int   priority);
    ~Hf_PluginEntry();

    Hf_PluginEntry(Hf_PluginEntry &&source);
    Hf_PluginEntry &operator =(Hf_PluginEntry &&source);

    const TfType         &GetType()        const { return _type;             }
    const std::string    &GetDisplayName() const { return _displayName;      }
    int                   GetPriority()    const { return _priority;         }
    HfPluginBase         *GetInstance()    const { return _instance;         }

    TfToken            GetId() const;

    void               GetDesc(HfPluginDesc *desc) const;

    void IncRefCount();
    void DecRefCount();

    bool operator <(const Hf_PluginEntry &other) const;

    static void SetFactory(TfType &type, _PluginFactoryFn &func);

private:
    class _Factory final : public TfType::FactoryBase
    {
    public:

        _Factory(_PluginFactoryFn &func) : _func(func) {}

        HfPluginBase *New() const { return _func(); }

    private:
        _PluginFactoryFn _func;
    };


    TfType                _type;
    std::string           _displayName;
    int                   _priority;
    HfPluginBase         *_instance;
    int                   _refCount;

    Hf_PluginEntry()                                   = delete;
    Hf_PluginEntry(const Hf_PluginEntry &)             = delete;
    Hf_PluginEntry &operator =(const Hf_PluginEntry &) = delete;
};



PXR_NAMESPACE_CLOSE_SCOPE

#endif // HF_PLUGIN_ENTRY_H