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/*
* Copyright (C) 2012,2013 Google Inc. All rights reserved.
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_COLLECTION_ITEMS_CACHE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_COLLECTION_ITEMS_CACHE_H_
#include "third_party/blink/renderer/core/dom/collection_index_cache.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
template <typename Collection, typename NodeType>
class CollectionItemsCache : public CollectionIndexCache<Collection, NodeType> {
DISALLOW_NEW();
typedef CollectionIndexCache<Collection, NodeType> Base;
public:
CollectionItemsCache();
~CollectionItemsCache();
void Trace(blink::Visitor* visitor) override {
visitor->Trace(cached_list_);
Base::Trace(visitor);
}
unsigned NodeCount(const Collection&);
NodeType* NodeAt(const Collection&, unsigned index);
void Invalidate();
private:
bool list_valid_;
HeapVector<Member<NodeType>> cached_list_;
};
template <typename Collection, typename NodeType>
CollectionItemsCache<Collection, NodeType>::CollectionItemsCache()
: list_valid_(false) {}
template <typename Collection, typename NodeType>
CollectionItemsCache<Collection, NodeType>::~CollectionItemsCache() = default;
template <typename Collection, typename NodeType>
void CollectionItemsCache<Collection, NodeType>::Invalidate() {
Base::Invalidate();
if (list_valid_) {
cached_list_.Shrink(0);
list_valid_ = false;
}
}
template <class Collection, class NodeType>
unsigned CollectionItemsCache<Collection, NodeType>::NodeCount(
const Collection& collection) {
if (this->IsCachedNodeCountValid())
return this->CachedNodeCount();
NodeType* current_node = collection.TraverseToFirst();
unsigned current_index = 0;
while (current_node) {
cached_list_.push_back(current_node);
current_node = collection.TraverseForwardToOffset(
current_index + 1, *current_node, current_index);
}
this->SetCachedNodeCount(cached_list_.size());
list_valid_ = true;
return this->CachedNodeCount();
}
template <typename Collection, typename NodeType>
inline NodeType* CollectionItemsCache<Collection, NodeType>::NodeAt(
const Collection& collection,
unsigned index) {
if (list_valid_) {
DCHECK(this->IsCachedNodeCountValid());
return index < this->CachedNodeCount() ? cached_list_[index] : nullptr;
}
return Base::NodeAt(collection, index);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_COLLECTION_ITEMS_CACHE_H_
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