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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.
*/
#pragma once
#include "CachedResource.h"
#include "CachedResourceClient.h"
#include "CachedResourceHandle.h"
#include <wtf/FixedVector.h>
#include <wtf/HashCountedSet.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 CachedResource& resource)
: m_resource(const_cast<CachedResource*>(&resource))
, m_clientVector(resource.m_clients.computeSize())
{
size_t clientIndex = 0;
for (auto client : resource.m_clients)
m_clientVector[clientIndex++] = client.key;
}
T* next()
{
size_t size = m_clientVector.size();
while (m_index < size) {
auto& next = m_clientVector[m_index++];
if (next && m_resource->m_clients.contains(*next)) {
RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(T::expectedType() == CachedResourceClient::expectedType() || next->resourceClientType() == T::expectedType());
return static_cast<T*>(next.get());
}
}
return nullptr;
}
private:
CachedResourceHandle<CachedResource> m_resource;
FixedVector<WeakPtr<CachedResourceClient>> m_clientVector;
size_t m_index { 0 };
};
} // namespace WebCore
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