Source/core/dom/StaticNodeList.h

/*
 * Copyright (C) 2007, 2008 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:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#ifndef StaticNodeList_h
#define StaticNodeList_h

#include "core/dom/NodeList.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include <v8.h>

namespace blink {

class Element;
class Node;

template <typename NodeType>
class StaticNodeTypeList final : public NodeList {
public:
    static PassRefPtrWillBeRawPtr<StaticNodeTypeList> adopt(WillBeHeapVector<RefPtrWillBeMember<NodeType>>& nodes);

    static PassRefPtrWillBeRawPtr<StaticNodeTypeList> createEmpty()
    {
        return adoptRefWillBeNoop(new StaticNodeTypeList);
    }

    ~StaticNodeTypeList() override;

    unsigned length() const override;
    NodeType* item(unsigned index) const override;

    DECLARE_VIRTUAL_TRACE();

private:
    ptrdiff_t AllocationSize()
    {
        return m_nodes.capacity() * sizeof(RefPtrWillBeMember<NodeType>);
    }

    WillBeHeapVector<RefPtrWillBeMember<NodeType>> m_nodes;
};

typedef StaticNodeTypeList<Node> StaticNodeList;
typedef StaticNodeTypeList<Element> StaticElementList;

template <typename NodeType>
PassRefPtrWillBeRawPtr<StaticNodeTypeList<NodeType>> StaticNodeTypeList<NodeType>::adopt(WillBeHeapVector<RefPtrWillBeMember<NodeType>>& nodes)
{
    RefPtrWillBeRawPtr<StaticNodeTypeList<NodeType>> nodeList = adoptRefWillBeNoop(new StaticNodeTypeList<NodeType>);
    nodeList->m_nodes.swap(nodes);
    v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(nodeList->AllocationSize());
    return nodeList.release();
}

template <typename NodeType>
StaticNodeTypeList<NodeType>::~StaticNodeTypeList()
{
    v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-AllocationSize());
}

template <typename NodeType>
unsigned StaticNodeTypeList<NodeType>::length() const
{
    return m_nodes.size();
}

template <typename NodeType>
NodeType* StaticNodeTypeList<NodeType>::item(unsigned index) const
{
    if (index < m_nodes.size())
        return m_nodes[index].get();
    return 0;
}

template <typename NodeType>
void StaticNodeTypeList<NodeType>::trace(Visitor* visitor) { traceImpl(visitor); }
template <typename NodeType>
void StaticNodeTypeList<NodeType>::trace(InlinedGlobalMarkingVisitor visitor) { traceImpl(visitor); }

template <typename NodeType>
template <typename VisitorDispatcher>
ALWAYS_INLINE void StaticNodeTypeList<NodeType>::traceImpl(VisitorDispatcher visitor)
{
    visitor->trace(m_nodes);
    NodeList::trace(visitor);
}

} // namespace blink

#endif // StaticNodeList_h