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 sheets and html
22 pages from the web. It has a memory cache for these objects.
23*/
24
25#pragma once
26
27#include "CachedResourceClient.h"
28#include <wtf/HashCountedSet.h>
29#include <wtf/Vector.h>
30
31namespace WebCore {
32
33// Call this "walker" instead of iterator so people won't expect Qt or STL-style iterator interface.
34// Just keep calling next() on this. It's safe from deletions of items.
35template<typename T>
36class CachedResourceClientWalker {
37public:
38 CachedResourceClientWalker(const HashCountedSet<CachedResourceClient*>& clientSet)
39 : m_clientSet(clientSet)
40 , m_clientVector(clientSet.size())
41 {
42 size_t clientIndex = 0;
43 for (const auto& client : clientSet)
44 m_clientVector[clientIndex++] = client.key;
45 }
46
47 T* next()
48 {
49 size_t size = m_clientVector.size();
50 while (m_index < size) {
51 CachedResourceClient* next = m_clientVector[m_index++];
52 if (m_clientSet.contains(next)) {
53 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(T::expectedType() == CachedResourceClient::expectedType() || next->resourceClientType() == T::expectedType());
54 return static_cast<T*>(next);
55 }
56 }
57 return nullptr;
58 }
59private:
60 const HashCountedSet<CachedResourceClient*>& m_clientSet;
61 Vector<CachedResourceClient*> m_clientVector;
62 size_t m_index { 0 };
63};
64
65} // namespace WebCore
66