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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is
 * Ehsan Akhgari.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Ehsan Akhgari <ehsan.akhgari@gmail.com> (Original author)
 *
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#ifndef nsClipboardPrivacyHandler_h__
#define nsClipboardPrivacyHandler_h__

#include "nsIObserver.h"
#include "nsIPrivateBrowsingService.h"
#include "nsWeakReference.h"
#include "nsCOMPtr.h"

class nsITransferable;

// nsClipboardPrivacyHandler makes sure that clipboard data copied during
// the private browsing mode does not leak after exiting this mode.
// In order to ensure this, callers should store an object of this class
// for their lifetime, and call PrepareDataForClipboard in their
// nsIClipboard::SetData implementation before starting to use the
// nsITransferable object in any way.

class nsClipboardPrivacyHandler : public nsIObserver,
                                  public nsSupportsWeakReference
{

public:

  // nsISupports
  NS_DECL_ISUPPORTS

  // nsIObserver  
  NS_DECL_NSIOBSERVER

  nsresult Init();
  nsresult PrepareDataForClipboard(nsITransferable * aTransferable);

private:

  bool InPrivateBrowsing();

  nsCOMPtr<nsIPrivateBrowsingService> mPBService;

};

nsresult NS_NewClipboardPrivacyHandler(nsClipboardPrivacyHandler ** aHandler);

#endif // nsClipboardPrivacyHandler_h__