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 * The Original Code is mozilla.org code.
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#ifndef __nsMsgRDFDataSource_h
#define __nsMsgRDFDataSource_h

#include "nsCOMPtr.h"
#include "nsIRDFDataSource.h"
#include "nsIRDFService.h"
#include "nsIServiceManager.h"
#include "nsISupportsArray.h"
#include "nsIObserver.h"
#include "nsITransactionManager.h"
#include "nsIMsgWindow.h"
#include "nsIMsgRDFDataSource.h"
#include "nsWeakReference.h"

class nsMsgRDFDataSource : public nsIRDFDataSource,
                           public nsIObserver,
                           public nsSupportsWeakReference,
  						   public nsIMsgRDFDataSource
{
 public:
  nsMsgRDFDataSource();
  virtual ~nsMsgRDFDataSource();
  virtual nsresult Init();
  
  NS_DECL_ISUPPORTS
  NS_DECL_NSIMSGRDFDATASOURCE
  NS_DECL_NSIRDFDATASOURCE
  NS_DECL_NSIOBSERVER

  // called to reset the datasource to an empty state
  // if you need to release yourself as an observer/listener, do it here
  virtual void Cleanup();

 protected:
	nsIRDFService *getRDFService();
	static PRBool assertEnumFunc(nsISupports *aElement, void *aData);
	static PRBool unassertEnumFunc(nsISupports *aElement, void *aData);
	static PRBool changeEnumFunc(nsISupports *aElement, void *aData);
	nsresult  NotifyObservers(nsIRDFResource *subject, nsIRDFResource *property,
								nsIRDFNode *object, PRBool assert, PRBool change);

	nsresult NotifyPropertyChanged(nsIRDFResource *resource,
													  nsIRDFResource *propertyResource,
													  nsIRDFNode *newNode);
	nsresult GetTransactionManager(nsISupportsArray *sources, nsITransactionManager **aTransactionManager);

	nsCOMPtr<nsIMsgWindow> mWindow;

	PRBool m_shuttingDown;
    PRBool mInitialized;

 private:
  nsCOMPtr<nsIRDFService> mRDFService;
  nsCOMPtr<nsISupportsArray> mObservers;

};

#endif