sky/engine/core/frame/DOMWindowProperty.cpp

/*
 * Copyright (C) 2011 Google, Inc. All Rights Reserved.
 * Copyright (C) 2012 Apple Inc. All Rights Reserved.
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 * Redistribution and use in source and binary forms, with or without
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "sky/engine/core/frame/DOMWindowProperty.h"

#include "sky/engine/core/frame/LocalDOMWindow.h"
#include "sky/engine/core/frame/LocalFrame.h"

namespace blink {

DOMWindowProperty::DOMWindowProperty(LocalFrame* frame)
    : m_frame(frame)
    , m_associatedDOMWindow(0)
{
    // FIXME: For now it *is* acceptable for a DOMWindowProperty to be created with a null frame.
    // See fast/dom/navigator-detached-no-crash.html for the recipe.
    // We should fix that.  <rdar://problem/11567132>
    if (m_frame) {
        m_associatedDOMWindow = m_frame->domWindow();
        m_associatedDOMWindow->registerProperty(this);
    }
}

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

    m_associatedDOMWindow = 0;
    m_frame = 0;
}

void DOMWindowProperty::willDestroyGlobalObjectInFrame()
{
    // If the property is getting this callback it must have been created with a LocalFrame/LocalDOMWindow and it should still have them.
    ASSERT(m_frame);
    ASSERT(m_associatedDOMWindow);

    // DOMWindowProperty lifetime isn't tied directly to the LocalDOMWindow itself so it is important that it unregister
    // itself from any LocalDOMWindow it is associated with if that LocalDOMWindow is going away.
    if (m_associatedDOMWindow)
        m_associatedDOMWindow->unregisterProperty(this);
    m_associatedDOMWindow = 0;
    m_frame = 0;
}

void DOMWindowProperty::willDetachGlobalObjectFromFrame()
{
    // If the property is getting this callback it must have been created with a LocalFrame/LocalDOMWindow and it should still have them.
    ASSERT(m_frame);
    ASSERT(m_associatedDOMWindow);
}

}