/*  This file is part of the KDE project.

Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

This library is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 2.1 or 3 of the License.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef PHONON_COMPOINTER_H

#define PHONON_COMPOINTER_H

#include <windows.h>

#include <dshow.h>

QT_BEGIN_NAMESPACE

namespace Phonon

{

    namespace DS9

    {

        template<class T> class ComPointer

        {

        public:

            explicit ComPointer(T *t = 0) : m_t(t)

            {

            }

            explicit ComPointer( const IID &clsid, const IID &iid) : m_t(0)

            {

                ::CoCreateInstance(clsid, 0, CLSCTX_INPROC_SERVER, iid,

                    reinterpret_cast<void**>(&m_t));

            }

            explicit ComPointer(IUnknown *_unk, const GUID &guid) : m_t(0)

            {

                if (_unk) {

                    _unk->QueryInterface(guid, reinterpret_cast<void**>(&m_t));

                }

            }

            ComPointer(const ComPointer<T> &other) : m_t(other.m_t)

            {

                if (m_t) {

                    m_t->AddRef();

                }

            }

            ComPointer<T> &operator=(const ComPointer<T> &other)

            {

                if (other.m_t) {

                    other.m_t->AddRef();

                }

                if (m_t) { 

                    m_t->Release();

                }

                m_t = other.m_t;

                return *this;

            }

            T *operator->() const 

            {

                return m_t;

            }

            operator T*() const 

            {

                return m_t; 

            }

            //the following method first reinitialize their value to avoid mem leaks

            T ** pparam()

            {

                if (m_t) { 

                    m_t->Release();

                    m_t = 0;

                }

                return &m_t;

            }

			bool operator==(const ComPointer<T> &other) const

            {

                return m_t == other.m_t;

            }

            bool operator!=(const ComPointer<T> &other) const

            {

                return m_t != other.m_t;

            }

            ~ComPointer()

            {

                if (m_t) { 

                    m_t->Release();

                }

            }

        private:

            T *m_t;

        };

    }

}

QT_END_NAMESPACE

#endif