/* -*- 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

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