1/*
2 * Copyright (C) 2011 Google, 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 GOOGLE 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#include "config.h"
27#include "FrameDestructionObserver.h"
28
29#include "Frame.h"
30
31namespace WebCore {
32
33FrameDestructionObserver::FrameDestructionObserver(Frame* frame)
34    : m_frame(0)
35{
36    observeFrame(frame);
37}
38
39FrameDestructionObserver::~FrameDestructionObserver()
40{
41    observeFrame(0);
42
43}
44
45void FrameDestructionObserver::observeFrame(Frame* frame)
46{
47    if (m_frame)
48        m_frame->removeDestructionObserver(this);
49
50    m_frame = frame;
51
52    if (m_frame)
53        m_frame->addDestructionObserver(this);
54}
55
56void FrameDestructionObserver::frameDestroyed()
57{
58    m_frame = 0;
59}
60
61void FrameDestructionObserver::willDetachPage()
62{
63    // Subclasses should override this function to handle this notification.
64}
65
66}
67