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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 *newObject, nsIRDFNode *oldObject, 
                            PRBool assert, PRBool change);

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

  nsCOMPtr<nsIMsgWindow> mWindow;

  PRBool m_shuttingDown;
  PRBool mInitialized;

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

};

#endif