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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 .
+ */
+
+#include <memory>
+#include <tools/IconCache.hxx>
+
+#include <tools/debug.hxx>
+#include <osl/doublecheckedlocking.h>
+#include <osl/getglobalmutex.hxx>
+#include <unordered_map>
+
+namespace sd
+{
+//===== IconCache::Implementation =============================================
+
+class IconCache::Implementation
+{
+private:
+ friend class IconCache;
+
+ /** This pointer holds a valid reference from first time that
+ IconCache::Instance() is called to the end of the sd module when the
+ cache is destroyed from SdGlobalResourceContainer.
+ */
+ static IconCache* s_pIconCache;
+
+ typedef std::unordered_map<OUString, Image> ImageContainer;
+ ImageContainer maContainer;
+
+ Image GetIcon(const OUString& rResourceId);
+};
+
+IconCache* IconCache::Implementation::s_pIconCache = nullptr;
+
+Image IconCache::Implementation::GetIcon(const OUString& rResourceId)
+{
+ Image aResult;
+ ImageContainer::iterator iImage = maContainer.find(rResourceId);
+ if (iImage == maContainer.end())
+ {
+ aResult = Image(StockImage::Yes, rResourceId);
+ maContainer[rResourceId] = aResult;
+ }
+ else
+ aResult = iImage->second;
+ return aResult;
+}
+
+//===== IconCache =============================================================
+
+//static
+IconCache& IconCache::Instance()
+{
+ if (Implementation::s_pIconCache == nullptr)
+ {
+ ::osl::GetGlobalMutex aMutexFunctor;
+ ::osl::MutexGuard aGuard(aMutexFunctor());
+ if (Implementation::s_pIconCache == nullptr)
+ {
+ IconCache* pCache = new IconCache();
+ SdGlobalResourceContainer::Instance().AddResource(
+ ::std::unique_ptr<SdGlobalResource>(pCache));
+ OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+ Implementation::s_pIconCache = pCache;
+ }
+ }
+ else
+ {
+ OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+ }
+
+ DBG_ASSERT(Implementation::s_pIconCache != nullptr, "IconCache::Instance(): instance is NULL");
+ return *Implementation::s_pIconCache;
+}
+
+Image IconCache::GetIcon(const OUString& rResourceId) { return mpImpl->GetIcon(rResourceId); }
+
+IconCache::IconCache()
+ : mpImpl(new Implementation)
+{
+}
+
+IconCache::~IconCache()
+{
+ // empty
+}
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */