Pass implementation object to supplemental classes by reference

Source/modules/notifications/DOMWindowNotifications.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 19 matching lines @@
 #if ENABLE(LEGACY_NOTIFICATIONS)
 
 #include "core/dom/Document.h"
 #include "core/frame/DOMWindow.h"
 #include "core/page/Page.h"
 #include "modules/notifications/NotificationCenter.h"
 #include "modules/notifications/NotificationController.h"
 
 namespace WebCore {
 
-DOMWindowNotifications::DOMWindowNotifications(DOMWindow* window)
-    : DOMWindowProperty(window->frame())
+DOMWindowNotifications::DOMWindowNotifications(DOMWindow& window)
+    : DOMWindowProperty(window.frame())
     , m_window(window)
 {
 }
 
 DOMWindowNotifications::~DOMWindowNotifications()
 {
 }
 
 const char* DOMWindowNotifications::supplementName()
 {
     return "DOMWindowNotifications";
 }
 
-DOMWindowNotifications* DOMWindowNotifications::from(DOMWindow* window)
+DOMWindowNotifications& DOMWindowNotifications::from(DOMWindow& window)
 {
     DOMWindowNotifications* supplement = static_cast<DOMWindowNotifications*>(Supplement<DOMWindow>::from(window, supplementName()));
     if (!supplement) {
         supplement = new DOMWindowNotifications(window);
         Supplement<DOMWindow>::provideTo(window, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
-NotificationCenter* DOMWindowNotifications::webkitNotifications(DOMWindow* window)
+NotificationCenter* DOMWindowNotifications::webkitNotifications(DOMWindow& window)
 {
-    return DOMWindowNotifications::from(window)->webkitNotifications();
+    return DOMWindowNotifications::from(window).webkitNotifications();
 }
 
 void DOMWindowNotifications::willDestroyGlobalObjectInFrame()
 {
     m_notificationCenter = 0;
     DOMWindowProperty::willDestroyGlobalObjectInFrame();
 }
 
 void DOMWindowNotifications::willDetachGlobalObjectFromFrame()
 {
     m_notificationCenter = 0;
     DOMWindowProperty::willDetachGlobalObjectFromFrame();
 }
 
 NotificationCenter* DOMWindowNotifications::webkitNotifications()
 {
-    if (!m_window->isCurrentlyDisplayedInFrame())
+    if (!m_window.isCurrentlyDisplayedInFrame())
         return 0;
 
     if (m_notificationCenter)
         return m_notificationCenter.get();
 
-    Document* document = m_window->document();
+    Document* document = m_window.document();
     if (!document)
         return 0;
 
     Page* page = document->page();
     if (!page)
         return 0;
 
     NotificationClient* provider = NotificationController::clientFrom(page);
     if (provider)
         m_notificationCenter = NotificationCenter::create(document, provider);
 
     return m_notificationCenter.get();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(LEGACY_NOTIFICATIONS)