dynload.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

/*
 * This file is part of LibreOffice published API.
 */

#ifndef INCLUDED_SALHELPER_DYNLOAD_HXX
#define INCLUDED_SALHELPER_DYNLOAD_HXX

#include "sal/types.h"
#include "rtl/ustring.hxx"
#include "osl/module.h"
#include "salhelper/salhelperdllapi.h"

namespace salhelper
{

class SALHELPER_DLLPUBLIC ORealDynamicLoader
{
public:
    static ORealDynamicLoader* SAL_CALL newInstance(
            ORealDynamicLoader ** ppSetToZeroInDestructor,
            const ::rtl::OUString& strModuleName,
            const ::rtl::OUString& strInitFunction );

    sal_uInt32 SAL_CALL acquire();
    sal_uInt32 SAL_CALL release();

    void* SAL_CALL getApi() const;

protected:
    ORealDynamicLoader( ORealDynamicLoader ** ppSetToZeroInDestructor,
                        const ::rtl::OUString& strModuleName,
                        const ::rtl::OUString& strInitFunction,
                        void* pApi,
                        oslModule pModule );

    virtual ~ORealDynamicLoader();

    void*                   m_pApi;
    sal_uInt32              m_refCount;
    oslModule               m_pModule;
    ::rtl::OUString         m_strModuleName;
    ::rtl::OUString         m_strInitFunction;
    ORealDynamicLoader **   ppSetToZeroInDestructor;
};


template<class API>
class ODynamicLoader
{
public:
    ODynamicLoader()
    {
        m_pLoader = NULL;
    }

    ODynamicLoader( const ::rtl::OUString& strModuleName,
                       const ::rtl::OUString& strInitFunction )
    {
        if (!m_pStaticLoader)
        {
            m_pStaticLoader = ORealDynamicLoader::newInstance(
               &m_pStaticLoader,
               strModuleName,
               strInitFunction);
        }
        else
        {
            m_pStaticLoader->acquire();
        }

        m_pLoader = m_pStaticLoader;
    }

    ODynamicLoader(const ODynamicLoader<API>& toCopy)
    {
        m_pLoader = toCopy.m_pLoader;
        if( m_pLoader )
            m_pLoader->acquire();
    }

    ~ODynamicLoader()
    {
        if( m_pLoader )
            if (m_pLoader->release()==0)
                m_pStaticLoader = NULL;
    }

    ODynamicLoader<API>& SAL_CALL operator = (const ODynamicLoader<API>& toAssign)
    {
        if( m_pLoader != toAssign.m_pLoader )
        {
            if( toAssign.m_pLoader )
            {
                toAssign.m_pLoader->acquire();
            }
            if( m_pLoader )
            {
                m_pLoader->release();
            }
            m_pLoader = toAssign.m_pLoader;
        }

        return (*this);
    }

    API* SAL_CALL getApi() const
    {
        return static_cast<API*>(m_pLoader->getApi());
    }

    API* SAL_CALL operator->() const
    {
        return static_cast<API*>(m_pLoader->getApi());
    }

    bool SAL_CALL isLoaded() const
    {
        return (m_pLoader != NULL);
    }

protected:
    static ORealDynamicLoader*  m_pStaticLoader;
    ORealDynamicLoader*         m_pLoader;
};


template<class API>
ORealDynamicLoader* ODynamicLoader<API>::m_pStaticLoader = NULL;

}

#endif

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