/* Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) Copyright (C) 2001 Dirk Mueller <mueller@kde.org> Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. This class provides all functionality needed for loading images, style sheets and html pages from the web. It has a memory cache for these objects. */ #ifndef CachedResourceClientWalker_h #define CachedResourceClientWalker_h #include "CachedResourceClient.h" #include <wtf/HashCountedSet.h> #include <wtf/Vector.h> namespace WebCore { // Call this "walker" instead of iterator so people won't expect Qt or STL-style iterator interface. // Just keep calling next() on this. It's safe from deletions of items. template<typename T> class CachedResourceClientWalker { public: CachedResourceClientWalker(const HashCountedSet<CachedResourceClient*>& set) : m_clientSet(set), m_clientVector(set.size()), m_index(0) { typedef HashCountedSet<CachedResourceClient*>::const_iterator Iterator; Iterator end = set.end(); size_t clientIndex = 0; for (Iterator current = set.begin(); current != end; ++current) m_clientVector[clientIndex++] = current->key; } T* next() { size_t size = m_clientVector.size(); while (m_index < size) { CachedResourceClient* next = m_clientVector[m_index++]; if (m_clientSet.contains(next)) { ASSERT_WITH_SECURITY_IMPLICATION(T::expectedType() == CachedResourceClient::expectedType() || next->resourceClientType() == T::expectedType()); return static_cast<T*>(next); } } return 0; } private: const HashCountedSet<CachedResourceClient*>& m_clientSet; Vector<CachedResourceClient*> m_clientVector; size_t m_index; }; } #endif