DOMWindowProperty.cpp   [plain text]

/*
 * Copyright (C) 2011 Google, Inc. All Rights Reserved.
 * Copyright (C) 2012 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.
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``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 INC. 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
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#include "config.h"
#include "DOMWindowProperty.h"

#include "DOMWindow.h"
#include "Document.h"
#include "Frame.h"

namespace WebCore {

DOMWindowProperty::DOMWindowProperty(DOMWindow* window)
    : m_window(window)
{
    if (m_window)
        m_window->registerProperty(*this);
}

DOMWindowProperty::~DOMWindowProperty()
{
    if (m_window)
        m_window->unregisterProperty(*this);

    m_window = nullptr;
}

void DOMWindowProperty::suspendForPageCache()
{
    ASSERT(m_window);
}

void DOMWindowProperty::resumeFromPageCache()
{
    // If this property is being reconnected to its Frame to enter the PageCache, it must have
    // been disconnected from its Frame in the first place and it should still have an associated DOMWindow.
    ASSERT(frame());
    ASSERT(frame()->document()->domWindow() == m_window);
}

void DOMWindowProperty::willDestroyGlobalObjectInCachedFrame()
{
    // If the property has been disconnected from its Frame for the page cache, then it must have originally had a Frame
    // and therefore should still have an associated DOMWindow.
    ASSERT(m_window);

    // DOMWindowProperty lifetime isn't tied directly to the DOMWindow itself so it is important that it unregister
    // itself from any DOMWindow it is associated with if that DOMWindow is going away.
    if (m_window)
        m_window->unregisterProperty(*this);
    m_window = nullptr;
}

void DOMWindowProperty::willDestroyGlobalObjectInFrame()
{
    ASSERT(m_window);

    // DOMWindowProperty lifetime isn't tied directly to the DOMWindow itself so it is important that it unregister
    // itself from any DOMWindow it is associated with if that DOMWindow is going away.
    if (m_window)
        m_window->unregisterProperty(*this);
    m_window = nullptr;
}

void DOMWindowProperty::willDetachGlobalObjectFromFrame()
{
}

Frame* DOMWindowProperty::frame() const
{
    return m_window ? m_window->frame() : nullptr;
}

}