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1 /* | |
2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) | |
3 Copyright (C) 2001 Dirk Mueller <mueller@kde.org> | |
4 Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. | |
5 | |
6 This library is free software; you can redistribute it and/or | |
7 modify it under the terms of the GNU Library General Public | |
8 License as published by the Free Software Foundation; either | |
9 version 2 of the License, or (at your option) any later version. | |
10 | |
11 This library is distributed in the hope that it will be useful, | |
12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 Library General Public License for more details. | |
15 | |
16 You should have received a copy of the GNU Library General Public License | |
17 along with this library; see the file COPYING.LIB. If not, write to | |
18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
19 Boston, MA 02110-1301, USA. | |
20 | |
21 This class provides all functionality needed for loading images, style sheet
s and html | |
22 pages from the web. It has a memory cache for these objects. | |
23 */ | |
24 | |
25 #ifndef ResourceClientOrObserverWalker_h | |
26 #define ResourceClientOrObserverWalker_h | |
27 | |
28 #include "core/fetch/ResourceClient.h" | |
29 #include "wtf/Allocator.h" | |
30 #include "wtf/HashCountedSet.h" | |
31 #include "wtf/Vector.h" | |
32 | |
33 namespace blink { | |
34 | |
35 // Call this "walker" instead of iterator so people won't expect Qt or STL-style
iterator interface. | |
36 // Just keep calling next() on this. It's safe from deletions of items. | |
37 // ClientOrObserver is either ResourceClient or ImageResourceObserver, so that | |
38 // this walker can be used both for ResourceClient and ImageResourceObserver. | |
39 template<typename ClientOrObserver, typename T> | |
40 class ResourceClientOrObserverWalker { | |
41 STACK_ALLOCATED(); | |
42 public: | |
43 explicit ResourceClientOrObserverWalker(const HashCountedSet<ClientOrObserve
r*>& set) | |
44 : m_clientSet(set), m_clientVector(set.size()), m_index(0) | |
45 { | |
46 size_t clientIndex = 0; | |
47 for (const auto& resourceClient : set) | |
48 m_clientVector[clientIndex++] = resourceClient.key; | |
49 } | |
50 | |
51 T* next() | |
52 { | |
53 size_t size = m_clientVector.size(); | |
54 while (m_index < size) { | |
55 ClientOrObserver* next = m_clientVector[m_index++]; | |
56 if (m_clientSet.contains(next)) { | |
57 ASSERT(T::isExpectedType(next)); | |
58 return static_cast<T*>(next); | |
59 } | |
60 } | |
61 | |
62 return 0; | |
63 } | |
64 private: | |
65 const HashCountedSet<ClientOrObserver*>& m_clientSet; | |
66 Vector<ClientOrObserver*> m_clientVector; | |
67 size_t m_index; | |
68 }; | |
69 | |
70 template<typename T> | |
71 struct ResourceClientWalker : public ResourceClientOrObserverWalker<ResourceClie
nt, T> { | |
72 public: | |
73 explicit ResourceClientWalker(const HashCountedSet<ResourceClient*>& set) | |
74 : ResourceClientOrObserverWalker<ResourceClient, T>(set) { } | |
75 }; | |
76 | |
77 } // namespace blink | |
78 | |
79 #endif | |
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