sd/source/ui/tools/IconCache.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <memory>
  21 #include <tools/IconCache.hxx>
  22
  23 #include <tools/debug.hxx>
  24 #include <osl/doublecheckedlocking.h>
  25 #include <osl/getglobalmutex.hxx>
  26 #include <unordered_map>
  27
  28 namespace sd {
  29
  30 //===== IconCache::Implementation =============================================
  31
  32 class IconCache::Implementation
  33 {
  34 private:
  35     friend class IconCache;
  36
  37     /** This pointer holds a valid reference from first time that
  38         IconCache::Instance() is called to the end of the sd module when the
  39         cache is destroyed from SdGlobalResourceContainer.
  40     */
  41     static IconCache* s_pIconCache;
  42
  43     typedef std::unordered_map<OUString, Image> ImageContainer;
  44     ImageContainer maContainer;
  45
  46     Image GetIcon(const OUString& rResourceId);
  47 };
  48
  49 IconCache* IconCache::Implementation::s_pIconCache = nullptr;
  50
  51 Image IconCache::Implementation::GetIcon(const OUString& rResourceId)
  52 {
  53     Image aResult;
  54     ImageContainer::iterator iImage = maContainer.find(rResourceId);
  55     if (iImage == maContainer.end())
  56     {
  57         aResult = Image(StockImage::Yes, rResourceId);
  58         maContainer[rResourceId] = aResult;
  59     }
  60     else
  61         aResult = iImage->second;
  62     return aResult;
  63 }
  64
  65 //===== IconCache =============================================================
  66
  67 //static
  68 IconCache& IconCache::Instance()
  69 {
  70     if (Implementation::s_pIconCache == nullptr)
  71     {
  72         ::osl::GetGlobalMutex aMutexFunctor;
  73         ::osl::MutexGuard aGuard (aMutexFunctor());
  74         if (Implementation::s_pIconCache == nullptr)
  75         {
  76             IconCache* pCache = new IconCache ();
  77             SdGlobalResourceContainer::Instance().AddResource (
  78                 ::std::unique_ptr<SdGlobalResource>(pCache));
  79             OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
  80             Implementation::s_pIconCache = pCache;
  81         }
  82     }
  83     else
  84     {
  85         OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
  86     }
  87
  88     DBG_ASSERT(Implementation::s_pIconCache != nullptr,
  89         "IconCache::Instance(): instance is NULL");
  90     return *Implementation::s_pIconCache;
  91 }
  92
  93 Image IconCache::GetIcon(const OUString& rResourceId)
  94 {
  95     return mpImpl->GetIcon(rResourceId);
  96 }
  97
  98 IconCache::IconCache()
  99     : mpImpl (new Implementation)
 100 {
 101 }
 102
 103 IconCache::~IconCache()
 104 {
 105     // empty
 106 }
 107
 108 } // end of namespace sd
 109
 110 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */