/* -*- 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 . */ #pragma once #include <sal/config.h> #include <mutex> #include <cppuhelper/propshlp.hxx> #include <cassert> #include <unordered_map> namespace comphelper { typedef std::unordered_map< sal_Int32, ::cppu::IPropertyArrayHelper* > OIdPropertyArrayMap; template <class TYPE> class OIdPropertyArrayUsageHelper { public: OIdPropertyArrayUsageHelper(); virtual ~OIdPropertyArrayUsageHelper() { std::unique_lock aGuard(theMutex()); assert(s_nRefCount > 0 && "OIdPropertyArrayUsageHelper::~OIdPropertyArrayUsageHelper : suspicious call : have a refcount of 0 !"); if (!--s_nRefCount) { // delete the element for (auto const& elem : *s_pMap) delete elem.second; delete s_pMap; s_pMap = nullptr; } } /** call this in the getInfoHelper method of your derived class. The method returns the array helper of the class, which is created if necessary. */ ::cppu::IPropertyArrayHelper* getArrayHelper(sal_Int32 nId); protected: /** used to implement the creation of the array helper which is shared amongst all instances of the class. This method needs to be implemented in derived classes. <BR> The method gets called with Mutex acquired. @return a pointer to the newly created array helper. Must not be NULL. */ virtual ::cppu::IPropertyArrayHelper* createArrayHelper(sal_Int32 nId) const = 0; private: static sal_Int32 s_nRefCount; static OIdPropertyArrayMap* s_pMap; static std::mutex& theMutex() { static std::mutex SINGLETON; return SINGLETON; } }; template<class TYPE> sal_Int32 OIdPropertyArrayUsageHelper< TYPE >::s_nRefCount = 0; template<class TYPE> OIdPropertyArrayMap* OIdPropertyArrayUsageHelper< TYPE >::s_pMap = nullptr; template <class TYPE> OIdPropertyArrayUsageHelper<TYPE>::OIdPropertyArrayUsageHelper() { std::unique_lock aGuard(theMutex()); // create the map if necessary if (!s_pMap) s_pMap = new OIdPropertyArrayMap; ++s_nRefCount; } template <class TYPE> ::cppu::IPropertyArrayHelper* OIdPropertyArrayUsageHelper<TYPE>::getArrayHelper(sal_Int32 nId) { assert(s_nRefCount && "OIdPropertyArrayUsageHelper::getArrayHelper : suspicious call : have a refcount of 0 !"); std::unique_lock aGuard(theMutex()); // do we have the array already? auto& rEntry = (*s_pMap)[nId]; if (!rEntry) { rEntry = createArrayHelper(nId); assert(rEntry && "OIdPropertyArrayUsageHelper::getArrayHelper : createArrayHelper returned nonsense !"); } return (*s_pMap)[nId]; } } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */