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      1 /*
      2  * Copyright (C) 2009 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
      6  * are met:
      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. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef StorageAreaProxy_h
     27 #define StorageAreaProxy_h
     28 
     29 #include "core/storage/StorageArea.h"
     30 
     31 namespace blink {
     32 class WebStorageArea;
     33 class WebStorageNamespace;
     34 }
     35 
     36 namespace WebCore {
     37 
     38 class ExceptionState;
     39 class Frame;
     40 class KURL;
     41 class Page;
     42 class SecurityOrigin;
     43 class Storage;
     44 
     45 class StorageAreaProxy : public StorageArea {
     46 public:
     47     StorageAreaProxy(PassOwnPtr<blink::WebStorageArea>, StorageType);
     48     virtual ~StorageAreaProxy();
     49 
     50     // The HTML5 DOM Storage API
     51     virtual unsigned length(ExceptionState&, Frame* sourceFrame);
     52     virtual String key(unsigned index, ExceptionState&, Frame* sourceFrame);
     53     virtual String getItem(const String& key, ExceptionState&, Frame* sourceFrame);
     54     virtual void setItem(const String& key, const String& value, ExceptionState&, Frame* sourceFrame);
     55     virtual void removeItem(const String& key, ExceptionState&, Frame* sourceFrame);
     56     virtual void clear(ExceptionState&, Frame* sourceFrame);
     57     virtual bool contains(const String& key, ExceptionState&, Frame* sourceFrame);
     58 
     59     virtual bool canAccessStorage(Frame*);
     60 
     61     virtual size_t memoryBytesUsedByCache();
     62 
     63     static void dispatchLocalStorageEvent(
     64             const String& key, const String& oldValue, const String& newValue,
     65             SecurityOrigin*, const KURL& pageURL, blink::WebStorageArea* sourceAreaInstance, bool originatedInProcess);
     66     static void dispatchSessionStorageEvent(
     67             const String& key, const String& oldValue, const String& newValue,
     68             SecurityOrigin*, const KURL& pageURL, const blink::WebStorageNamespace&,
     69             blink::WebStorageArea* sourceAreaInstance, bool originatedInProcess);
     70 
     71 private:
     72     static bool isEventSource(Storage*, blink::WebStorageArea* sourceAreaInstance);
     73 
     74     OwnPtr<blink::WebStorageArea> m_storageArea;
     75     StorageType m_storageType;
     76     mutable bool m_canAccessStorageCachedResult;
     77     mutable Frame* m_canAccessStorageCachedFrame;
     78 };
     79 
     80 } // namespace WebCore
     81 
     82 #endif // StorageAreaProxy_h
     83