/*
 * Copyright 2006-2007, Haiku.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Stephan Aßmus <superstippi@gmx.de>
 */
#ifndef COMMAND_STACK_H
#define COMMAND_STACK_H

#include <stack>

#include "Notifier.h"

class BString;
class RWLocker;
class Command;

class CommandStack : public Notifier {
 public:
                                                                CommandStack(RWLocker* locker);
        virtual                                         ~CommandStack();

                        status_t                        Perform(Command* command);

                        status_t                        Undo();
                        status_t                        Redo();

                        bool                            GetUndoName(BString& name);
                        bool                            GetRedoName(BString& name);

                        void                            Clear();
                        void                            Save();
                        bool                            IsSaved();

 private:
                        status_t                        _AddCommand(Command* command);

                        RWLocker*                       fLocker;

        typedef std::stack<Command*> command_stack;

                        command_stack           fUndoHistory;
                        command_stack           fRedoHistory;
                        Command*                        fSavedCommand;
};

#endif // COMMAND_STACK_H