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 
GetIcon(const OUString & rResourceId)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
Instance()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, "IconCache::Instance(): instance is NULL");
89     return *Implementation::s_pIconCache;
90 }
91 
GetIcon(const OUString & rResourceId)92 Image IconCache::GetIcon(const OUString& rResourceId) { return mpImpl->GetIcon(rResourceId); }
93 
IconCache()94 IconCache::IconCache()
95     : mpImpl(new Implementation)
96 {
97 }
98 
~IconCache()99 IconCache::~IconCache()
100 {
101     // empty
102 }
103 
104 } // end of namespace sd
105 
106 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
107