Pass implementation object to supplemental classes by reference

Source/modules/indexeddb/DOMWindowIndexedDatabase.cpp

 /*
  * Copyright (C) 2011, Google 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
@@ skipping 16 matching lines @@
 #include "modules/indexeddb/DOMWindowIndexedDatabase.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/DOMWindow.h"
 #include "core/page/Page.h"
 #include "modules/indexeddb/IDBFactory.h"
 #include "modules/indexeddb/PageGroupIndexedDatabase.h"
 
 namespace WebCore {
 
-DOMWindowIndexedDatabase::DOMWindowIndexedDatabase(DOMWindow* window)
-    : DOMWindowProperty(window->frame())
+DOMWindowIndexedDatabase::DOMWindowIndexedDatabase(DOMWindow& window)
+    : DOMWindowProperty(window.frame())
     , m_window(window)
 {
 }
 
 DOMWindowIndexedDatabase::~DOMWindowIndexedDatabase()
 {
 }
 
 const char* DOMWindowIndexedDatabase::supplementName()
 {
     return "DOMWindowIndexedDatabase";
 }
 
-DOMWindowIndexedDatabase* DOMWindowIndexedDatabase::from(DOMWindow* window)
+DOMWindowIndexedDatabase& DOMWindowIndexedDatabase::from(DOMWindow& window)
 {
     DOMWindowIndexedDatabase* supplement = static_cast<DOMWindowIndexedDatabase*>(Supplement<DOMWindow>::from(window, supplementName()));
     if (!supplement) {
         supplement = new DOMWindowIndexedDatabase(window);
         provideTo(window, supplementName(), adoptPtr(supplement));
     }
-    return supplement;
+    return *supplement;
 }
 
 void DOMWindowIndexedDatabase::willDestroyGlobalObjectInFrame()
 {
     m_idbFactory = nullptr;
     DOMWindowProperty::willDestroyGlobalObjectInFrame();
 }
 
 void DOMWindowIndexedDatabase::willDetachGlobalObjectFromFrame()
 {
     m_idbFactory = nullptr;
     DOMWindowProperty::willDetachGlobalObjectFromFrame();
 }
 
-IDBFactory* DOMWindowIndexedDatabase::indexedDB(DOMWindow* window)
+IDBFactory* DOMWindowIndexedDatabase::indexedDB(DOMWindow& window)
 {
-    return from(window)->indexedDB();
+    return from(window).indexedDB();
 }
 
 IDBFactory* DOMWindowIndexedDatabase::indexedDB()
 {
-    Document* document = m_window->document();
+    Document* document = m_window.document();
     if (!document)
         return 0;
 
     Page* page = document->page();
     if (!page)
         return 0;
 
-    if (!m_window->isCurrentlyDisplayedInFrame())
+    if (!m_window.isCurrentlyDisplayedInFrame())
         return 0;
 
     if (!m_idbFactory)
-        m_idbFactory = IDBFactory::create(PageGroupIndexedDatabase::from(page->group())->factoryBackend());
+        m_idbFactory = IDBFactory::create(PageGroupIndexedDatabase::from(page->group()).factoryBackend());
     return m_idbFactory.get();
 }
 
 } // namespace WebCore