1 /* 2 Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de) 3 Copyright (C) 2001 Dirk Mueller <mueller (at) 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 #ifndef ResourceClientWalker_h 26 #define ResourceClientWalker_h 27 28 #include "core/loader/cache/ResourceClient.h" 29 #include "wtf/HashCountedSet.h" 30 #include "wtf/Vector.h" 31 32 namespace WebCore { 33 34 // Call this "walker" instead of iterator so people won't expect Qt or STL-style iterator interface. 35 // Just keep calling next() on this. It's safe from deletions of items. 36 template<typename T> class ResourceClientWalker { 37 public: 38 ResourceClientWalker(const HashCountedSet<ResourceClient*>& set) 39 : m_clientSet(set), m_clientVector(set.size()), m_index(0) 40 { 41 typedef HashCountedSet<ResourceClient*>::const_iterator Iterator; 42 Iterator end = set.end(); 43 size_t clientIndex = 0; 44 for (Iterator current = set.begin(); current != end; ++current) 45 m_clientVector[clientIndex++] = current->key; 46 } 47 48 T* next() 49 { 50 size_t size = m_clientVector.size(); 51 while (m_index < size) { 52 ResourceClient* next = m_clientVector[m_index++]; 53 if (m_clientSet.contains(next)) { 54 ASSERT(T::expectedType() == ResourceClient::expectedType() || next->resourceClientType() == T::expectedType()); 55 return static_cast<T*>(next); 56 } 57 } 58 59 return 0; 60 } 61 private: 62 const HashCountedSet<ResourceClient*>& m_clientSet; 63 Vector<ResourceClient*> m_clientVector; 64 size_t m_index; 65 }; 66 67 } 68 69 #endif 70
