1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ElementIteratorAssertions_h
27#define ElementIteratorAssertions_h
28
29#include "Document.h"
30#include "Element.h"
31
32namespace WebCore {
33
34class ElementIteratorAssertions {
35public:
36    ElementIteratorAssertions();
37    ElementIteratorAssertions(const Element* first);
38    bool domTreeHasMutated() const;
39    void dropEventDispatchAssertion();
40
41private:
42    const Document* m_document;
43    uint64_t m_initialDOMTreeVersion;
44    OwnPtr<NoEventDispatchAssertion> m_noEventDispatchAssertion;
45};
46
47inline ElementIteratorAssertions::ElementIteratorAssertions()
48    : m_document(nullptr)
49    , m_initialDOMTreeVersion(0)
50{
51}
52
53inline ElementIteratorAssertions::ElementIteratorAssertions(const Element* first)
54    : m_document(first ? &first->document() : nullptr)
55    , m_initialDOMTreeVersion(m_document ? m_document->domTreeVersion() : 0)
56    , m_noEventDispatchAssertion(m_document ? adoptPtr(new NoEventDispatchAssertion) : nullptr)
57{
58}
59
60inline bool ElementIteratorAssertions::domTreeHasMutated() const
61{
62    return m_initialDOMTreeVersion && m_document && m_document->domTreeVersion() != m_initialDOMTreeVersion;
63}
64
65inline void ElementIteratorAssertions::dropEventDispatchAssertion()
66{
67    m_noEventDispatchAssertion = nullptr;
68}
69
70}
71
72#endif
73