1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4 *           (C) 2001 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 *
22 */
23
24#ifndef LiveNodeList_h
25#define LiveNodeList_h
26
27#include "core/dom/LiveNodeListBase.h"
28#include "core/dom/NodeList.h"
29#include "core/html/CollectionItemsCache.h"
30#include "core/html/CollectionType.h"
31#include "platform/heap/Handle.h"
32#include "wtf/PassRefPtr.h"
33
34namespace blink {
35
36class Element;
37
38class LiveNodeList : public NodeList, public LiveNodeListBase {
39    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LiveNodeList);
40public:
41    LiveNodeList(ContainerNode& ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
42        : LiveNodeListBase(ownerNode, rootType, invalidationType, collectionType) { }
43
44    virtual unsigned length() const OVERRIDE FINAL;
45    virtual Element* item(unsigned offset) const OVERRIDE FINAL;
46    virtual bool elementMatches(const Element&) const = 0;
47
48    virtual void invalidateCache(Document* oldDocument = 0) const OVERRIDE FINAL;
49    void invalidateCacheForAttribute(const QualifiedName*) const;
50
51    // Collection IndexCache API.
52    bool canTraverseBackward() const { return true; }
53    Element* traverseToFirst() const;
54    Element* traverseToLast() const;
55    Element* traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const;
56    Element* traverseBackwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const;
57
58    virtual void trace(Visitor*) OVERRIDE;
59
60private:
61    virtual Node* virtualOwnerNode() const OVERRIDE FINAL;
62
63    mutable CollectionItemsCache<LiveNodeList, Element> m_collectionItemsCache;
64};
65
66DEFINE_TYPE_CASTS(LiveNodeList, LiveNodeListBase, list, isLiveNodeListType(list->type()), isLiveNodeListType(list.type()));
67
68inline void LiveNodeList::invalidateCacheForAttribute(const QualifiedName* attrName) const
69{
70    if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName))
71        invalidateCache();
72}
73
74} // namespace blink
75
76#endif // LiveNodeList_h
77