/* -*- 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_COMPHELPER_SERVICEHELPER_HXX #define INCLUDED_COMPHELPER_SERVICEHELPER_HXX #include <rtl/uuid.h> #include <com/sun/star/lang/XUnoTunnel.hpp> #include <com/sun/star/uno/Sequence.hxx> namespace comphelper { // Class incapsulating UIDs used as e.g. tunnel IDs for css::lang::XUnoTunnel, // or implementation IDs for css::lang::XTypeProvider class UnoIdInit { private: css::uno::Sequence< sal_Int8 > m_aSeq; public: UnoIdInit() : m_aSeq(16) { rtl_createUuid(reinterpret_cast<sal_uInt8*>(m_aSeq.getArray()), nullptr, true); } const css::uno::Sequence< sal_Int8 >& getSeq() const { return m_aSeq; } }; inline sal_Int64 getSomething_cast(void* p) { return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_IntPtr>(p)); } template<class T> inline T* getSomething_cast(sal_Int64 n) { return reinterpret_cast<T*>(sal::static_int_cast<sal_IntPtr>(n)); } template <class T> T* getFromUnoTunnel(const css::uno::Reference<css::lang::XUnoTunnel>& xUT) { if (!xUT.is()) return nullptr; return getSomething_cast<T>(xUT->getSomething(T::getUnoTunnelId())); } // Takes an interface template <class T> T* getFromUnoTunnel(const css::uno::Reference<css::uno::XInterface>& xIface) { return getFromUnoTunnel<T>( css::uno::Reference<css::lang::XUnoTunnel>{ xIface, css::uno::UNO_QUERY }); } template <typename T> inline bool isUnoTunnelId(const css::uno::Sequence< sal_Int8 >& rId) { return rId.getLength() == 16 && memcmp(T::getUnoTunnelId().getConstArray(), rId.getConstArray(), 16) == 0; } template <class Base> struct FallbackToGetSomethingOf { static sal_Int64 get(const css::uno::Sequence<sal_Int8>& rId, Base* p) { return p->Base::getSomething(rId); } }; template <> struct FallbackToGetSomethingOf<void> { static sal_Int64 get(const css::uno::Sequence<sal_Int8>&, void*) { return 0; } }; template <class T, class Base = void> sal_Int64 getSomethingImpl(const css::uno::Sequence<sal_Int8>& rId, T* pThis, FallbackToGetSomethingOf<Base> = {}) { if (isUnoTunnelId<T>(rId)) return getSomething_cast(pThis); return FallbackToGetSomethingOf<Base>::get(rId, pThis); } } /** the UNO3_GETIMPLEMENTATION_* macros implement a static helper function that gives access to your implementation for a given interface reference, if possible. Example: MyClass* pClass = comphelper::getFromUnoTunnel<MyClass>( xRef ); Usage: Put a UNO3_GETIMPLEMENTATION_DECL( classname ) inside your class definition and UNO3_GETIMPLEMENTATION_IMPL( classname ) inside your cxx file. Your class must inherit css::lang::XUnoTunnel and export it with queryInterface. Implementation of XUnoTunnel is done by this macro. */ #define UNO3_GETIMPLEMENTATION_DECL( classname ) \ static const css::uno::Sequence< sal_Int8 > & getUnoTunnelId() noexcept; \ virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override; #define UNO3_GETIMPLEMENTATION_BASE_IMPL( classname ) \ const css::uno::Sequence< sal_Int8 > & classname::getUnoTunnelId() noexcept \ { \ static const comphelper::UnoIdInit aId; \ return aId.getSeq(); \ } #define UNO3_GETIMPLEMENTATION_IMPL( classname )\ UNO3_GETIMPLEMENTATION_BASE_IMPL(classname)\ sal_Int64 SAL_CALL classname::getSomething( const css::uno::Sequence< sal_Int8 >& rId ) \ { \ return comphelper::getSomethingImpl(rId, this); \ } #define UNO3_GETIMPLEMENTATION2_IMPL( classname, baseclass )\ UNO3_GETIMPLEMENTATION_BASE_IMPL(classname)\ sal_Int64 SAL_CALL classname::getSomething( const css::uno::Sequence< sal_Int8 >& rId ) \ { \ return comphelper::getSomethingImpl(rId, this, comphelper::FallbackToGetSomethingOf<baseclass>{}); \ } #endif // INCLUDED_COMPHELPER_SERVICEHELPER_HXX /* vim:set shiftwidth=4 softtabstop=4 expandtab: */