/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef TransactionItem_h

#define TransactionItem_h

#include "nsCOMPtr.h"

#include "nsCOMArray.h"

#include "nsCycleCollectionParticipant.h"

#include "nsISupportsImpl.h"

#include "nscore.h"

class nsITransaction;

namespace mozilla {

class TransactionManager;

class TransactionStack;

class TransactionItem final

{

public:

  explicit TransactionItem(nsITransaction* aTransaction);

  NS_METHOD_(MozExternalRefCountType) AddRef();

  NS_METHOD_(MozExternalRefCountType) Release();

  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(TransactionItem)

  nsresult AddChild(TransactionItem* aTransactionItem);

  already_AddRefed<nsITransaction> GetTransaction();

  nsresult GetIsBatch(bool *aIsBatch);

  nsresult GetNumberOfChildren(int32_t *aNumChildren);

  nsresult GetChild(int32_t aIndex, TransactionItem** aChild);

  nsresult DoTransaction();

  nsresult UndoTransaction(TransactionManager* aTransactionManager);

  nsresult RedoTransaction(TransactionManager* aTransactionManager);

  nsCOMArray<nsISupports>& GetData()

  {

    return mData;

  }

private:

  nsresult UndoChildren(TransactionManager* aTransactionManager);

  nsresult RedoChildren(TransactionManager* aTransactionManager);

  nsresult RecoverFromUndoError(TransactionManager* aTransactionManager);

  nsresult RecoverFromRedoError(TransactionManager* aTransactionManager);

  nsresult GetNumberOfUndoItems(int32_t* aNumItems);

  nsresult GetNumberOfRedoItems(int32_t* aNumItems);

  void CleanUp();

  ~TransactionItem();

  nsCycleCollectingAutoRefCnt mRefCnt;

  NS_DECL_OWNINGTHREAD

  nsCOMArray<nsISupports> mData;

  nsCOMPtr<nsITransaction> mTransaction;

  TransactionStack* mUndoStack;

  TransactionStack* mRedoStack;

};

} // namespace mozilla

#endif // #ifndef TransactionItem_h