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/*
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 ResourceClientOrObserverWalker_h
#define ResourceClientOrObserverWalker_h
#include "core/fetch/ResourceClient.h"
#include "wtf/Allocator.h"
#include "wtf/HashCountedSet.h"
#include "wtf/Vector.h"
namespace blink {
// 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.
// ClientOrObserver is either ResourceClient or ImageResourceObserver, so that
// this walker can be used both for ResourceClient and ImageResourceObserver.
template<typename ClientOrObserver, typename T>
class ResourceClientOrObserverWalker {
STACK_ALLOCATED();
public:
explicit ResourceClientOrObserverWalker(const HashCountedSet<ClientOrObserver*>& set)
: m_clientSet(set), m_clientVector(set.size()), m_index(0)
{
size_t clientIndex = 0;
for (const auto& resourceClient : set)
m_clientVector[clientIndex++] = resourceClient.key;
}
T* next()
{
size_t size = m_clientVector.size();
while (m_index < size) {
ClientOrObserver* next = m_clientVector[m_index++];
if (m_clientSet.contains(next)) {
ASSERT(T::isExpectedType(next));
return static_cast<T*>(next);
}
}
return 0;
}
private:
const HashCountedSet<ClientOrObserver*>& m_clientSet;
Vector<ClientOrObserver*> m_clientVector;
size_t m_index;
};
template<typename T>
struct ResourceClientWalker : public ResourceClientOrObserverWalker<ResourceClient, T> {
public:
explicit ResourceClientWalker(const HashCountedSet<ResourceClient*>& set)
: ResourceClientOrObserverWalker<ResourceClient, T>(set) { }
};
} // namespace blink
#endif
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