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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 .
*/
#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
{
/** The ORealDynamicLoader is an implementation helper class for the template loader ODynamicLoader.
*/
class SALHELPER_DLLPUBLIC ORealDynamicLoader
{
public:
/** initializes the loader, loads the library and call the initialization function.
@param ppSetToZeroInDestructor points to the loader instance which must be set to NULL
if the loader will be destroyed.
@param strModuleName specifies the library name.
@param strInitFunction specifies the name of the initialization function.
*/
static ORealDynamicLoader* SAL_CALL newInstance(
ORealDynamicLoader ** ppSetToZeroInDestructor,
const ::rtl::OUString& strModuleName,
const ::rtl::OUString& strInitFunction );
/// increase the reference count.
sal_uInt32 SAL_CALL acquire();
/// decrease the reference count and delete the last instance.
sal_uInt32 SAL_CALL release();
/// returns a pointer to the initialized API function structure.
void* SAL_CALL getApi() const;
protected:
/** Constructor.
@param ppSetToZeroInDestructor points to the loader instance which must be set to NULL
if the loader will be destroyed.
@param strModuleName specifies the library name.
@param strInitFunction specifies the name of the initialization function.
@param pApi points to a structure with the initialized API function pointers.
@param pModule points to the loaded library handle.
*/
ORealDynamicLoader( ORealDynamicLoader ** ppSetToZeroInDestructor,
const ::rtl::OUString& strModuleName,
const ::rtl::OUString& strInitFunction,
void* pApi,
oslModule pModule );
/// Destructor, try to unload the library.
virtual ~ORealDynamicLoader();
/// points to the structure with the initialized API function pointers.
void* m_pApi;
/// stores the reference count.
sal_uInt32 m_refCount;
/// stores the library handle.
oslModule m_pModule;
/// stores the library name.
::rtl::OUString m_strModuleName;
/// stores the name of the initialization function.
::rtl::OUString m_strInitFunction;
/** stores a pointer to itself, which must be reset in the destructor to signal
that the loader is invalid.
*/
ORealDynamicLoader ** ppSetToZeroInDestructor;
};
/** The ODynamicLoader provides a special load on call mechanism for dynamic libraries
which support a C-API.
The libraries must provide a struct with function pointers for all supported C functions.
The loader loads the specified library and call the specified initialization function
to initialize the function pointers with the real functions. Furthermore provides the
loader a reference counter for the library. When the last instance of the laoder will
be destroyed the loader will unload the library.
@deprecated
Do not use.
*/
template<class API>
class ODynamicLoader
{
public:
/// Default constructor
ODynamicLoader()
{
m_pLoader = NULL;
}
/** Constructor, loads the library if necessary otherwise the reference count will
be increased.
@param strModuleName specifies the library name.
@param strInitFunction specifies the name of the initialization function.
*/
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;
}
/// Copy constructor
ODynamicLoader(const ODynamicLoader<API>& toCopy)
{
m_pLoader = toCopy.m_pLoader;
if( m_pLoader )
m_pLoader->acquire();
}
/// Destructor, decrease the reference count and unload the library if it is the last instance.
~ODynamicLoader()
{
if( m_pLoader )
if (m_pLoader->release()==0)
m_pStaticLoader = NULL;
}
/// Assign operator
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);
}
/// returns a pointer to the initialized API function structure.
API* SAL_CALL getApi() const
{
return static_cast<API*>(m_pLoader->getApi());
}
/// cast operator, which cast to a pointer with the initialized API function structure.
API* SAL_CALL operator->() const
{
return static_cast<API*>(m_pLoader->getApi());
}
/// checks if the loader works on a loaded and initialized library.
bool SAL_CALL isLoaded() const
{
return (m_pLoader != NULL);
}
protected:
/// stores the real loader helper instance
static ORealDynamicLoader* m_pStaticLoader;
ORealDynamicLoader* m_pLoader;
};
template<class API>
ORealDynamicLoader* ODynamicLoader<API>::m_pStaticLoader = NULL;
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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