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      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 are met:
      6  *
      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. AND ITS CONTRIBUTORS ``AS IS'' AND
     14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     16  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
     17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     20  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     23  * DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "modules/indexeddb/DOMWindowIndexedDatabase.h"
     28 
     29 #include "core/dom/Document.h"
     30 #include "core/frame/LocalDOMWindow.h"
     31 #include "core/page/Page.h"
     32 #include "modules/indexeddb/IDBFactory.h"
     33 
     34 namespace WebCore {
     35 
     36 DOMWindowIndexedDatabase::DOMWindowIndexedDatabase(LocalDOMWindow& window)
     37     : DOMWindowProperty(window.frame())
     38     , m_window(window)
     39 {
     40 }
     41 
     42 DOMWindowIndexedDatabase::~DOMWindowIndexedDatabase()
     43 {
     44 }
     45 
     46 void DOMWindowIndexedDatabase::trace(Visitor* visitor)
     47 {
     48     visitor->trace(m_idbFactory);
     49     WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
     50 }
     51 
     52 const char* DOMWindowIndexedDatabase::supplementName()
     53 {
     54     return "DOMWindowIndexedDatabase";
     55 }
     56 
     57 DOMWindowIndexedDatabase& DOMWindowIndexedDatabase::from(LocalDOMWindow& window)
     58 {
     59     DOMWindowIndexedDatabase* supplement = static_cast<DOMWindowIndexedDatabase*>(WillBeHeapSupplement<LocalDOMWindow>::from(window, supplementName()));
     60     if (!supplement) {
     61         supplement = new DOMWindowIndexedDatabase(window);
     62         provideTo(window, supplementName(), adoptPtrWillBeNoop(supplement));
     63     }
     64     return *supplement;
     65 }
     66 
     67 void DOMWindowIndexedDatabase::willDestroyGlobalObjectInFrame()
     68 {
     69     m_idbFactory = nullptr;
     70     DOMWindowProperty::willDestroyGlobalObjectInFrame();
     71 }
     72 
     73 void DOMWindowIndexedDatabase::willDetachGlobalObjectFromFrame()
     74 {
     75     m_idbFactory = nullptr;
     76     DOMWindowProperty::willDetachGlobalObjectFromFrame();
     77 }
     78 
     79 IDBFactory* DOMWindowIndexedDatabase::indexedDB(LocalDOMWindow& window)
     80 {
     81     return from(window).indexedDB();
     82 }
     83 
     84 IDBFactory* DOMWindowIndexedDatabase::indexedDB()
     85 {
     86     Document* document = m_window.document();
     87     if (!document)
     88         return 0;
     89 
     90     Page* page = document->page();
     91     if (!page)
     92         return 0;
     93 
     94     if (!m_window.isCurrentlyDisplayedInFrame())
     95         return 0;
     96 
     97     if (!m_idbFactory)
     98         m_idbFactory = IDBFactory::create(IndexedDBClient::create());
     99     return m_idbFactory.get();
    100 }
    101 
    102 } // namespace WebCore
    103