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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef EditAggregateTxn_h__
#define EditAggregateTxn_h__

#include "EditTxn.h"
#include "nsIAtom.h"
#include "nsCOMPtr.h"
#include "nsISupportsArray.h"

#define EDIT_AGGREGATE_TXN_CID \
{/* 345921a0-ac49-11d2-86d8-000064657374 */ \
0x345921a0, 0xac49, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }


/**
 * 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);

  static const nsIID& GetCID() { static const nsIID cid = EDIT_AGGREGATE_TXN_CID; return cid; }

  EditAggregateTxn();

  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:

  nsCOMPtr<nsISupportsArray> mChildren;
  nsCOMPtr<nsIAtom> mName;
};

#endif