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| -rw-r--r-- | include/salhelper/dynload.hxx | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/include/salhelper/dynload.hxx b/include/salhelper/dynload.hxx new file mode 100644 index 000000000..b4ae693ea --- /dev/null +++ b/include/salhelper/dynload.hxx @@ -0,0 +1,209 @@ +/* -*- 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 +{ + +/** 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: */ |