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#ifndef EditAggregateTxn_h__
#define EditAggregateTxn_h__

#include "EditTxn.h"
#include "nsIAtom.h"
#include "nsCOMPtr.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"

/**
 * base class for all document editing transactions that require aggregation.
 * provides a list of child transactions.
 */
class EditAggregateTxn : public EditTxn
{
public:
  NS_IMETHOD QueryInterface(REFNSIID aIID, void **aInstancePtr);

  EditAggregateTxn();

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(EditAggregateTxn, EditTxn)

  NS_DECL_EDITTXN

  NS_IMETHOD RedoTransaction();
  NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);

  /** append a transaction to this aggregate */
  NS_IMETHOD AppendChild(EditTxn *aTxn);

  /** get the number of nested txns.  
    * This is the number of top-level txns, it does not do recursive decent.
    */
  NS_IMETHOD GetCount(PRUint32 *aCount);

  /** get the txn at index aIndex.
    * returns NS_ERROR_UNEXPECTED if there is no txn at aIndex.
    */
  NS_IMETHOD GetTxnAt(PRInt32 aIndex, EditTxn **aTxn);

  /** set the name assigned to this txn */
  NS_IMETHOD SetName(nsIAtom *aName);

  /** get the name assigned to this txn */
  NS_IMETHOD GetName(nsIAtom **aName);

protected:

  nsTArray< nsRefPtr<EditTxn> > mChildren;
  nsCOMPtr<nsIAtom> mName;
};

#endif
