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110 | /* -*- 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)<--- outer condition: Implementation::s_pIconCache==nullptr
{
::osl::GetGlobalMutex aMutexFunctor;
::osl::MutexGuard aGuard (aMutexFunctor());
if (Implementation::s_pIconCache == nullptr)<--- identical inner condition: 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: */
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