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diff --git a/include/comphelper/IdPropArrayHelper.hxx b/include/comphelper/IdPropArrayHelper.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 .
+ */
+#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: */