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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_CLIENT_WALKER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_CLIENT_WALKER_H_
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_client.h"
#include "third_party/blink/renderer/platform/wtf/allocator.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.
template <typename T>
class ResourceClientWalker {
STACK_ALLOCATED();
public:
explicit ResourceClientWalker(
const HeapHashCountedSet<WeakMember<ResourceClient>>& set)
: client_set_(set) {
CopyToVector(client_set_, client_vector_);
}
T* Next() {
size_t size = client_vector_.size();
while (index_ < size) {
ResourceClient* next = client_vector_[index_++];
DCHECK(next);
if (client_set_.Contains(next)) {
DCHECK(T::IsExpectedType(next));
return static_cast<T*>(next);
}
}
return nullptr;
}
private:
const HeapHashCountedSet<WeakMember<ResourceClient>>& client_set_;
HeapVector<Member<ResourceClient>> client_vector_;
size_t index_ = 0;
};
} // namespace blink
#endif
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