/*************************************************************************************
 *  Copyright (C) 2007 by Aleix Pol <aleixpol@kde.org>                               *
 *                                                                                   *
 *  This program is free software; you can redistribute it and/or                    *
 *  modify it under the terms of the GNU General Public License                      *
 *  as published by the Free Software Foundation; either version 2                   *
 *  of the License, or (at your option) any later version.                           *
 *                                                                                   *
 *  This program is distributed in the hope that it will be useful,                  *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of                   *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                    *
 *  GNU General Public License for more details.                                     *
 *                                                                                   *
 *  You should have received a copy of the GNU General Public License                *
 *  along with this program; if not, write to the Free Software                      *
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
 *************************************************************************************/

#ifndef VARIABLES_H
#define VARIABLES_H

#include <QHash>

#include "analitzaexport.h"

namespace Analitza
{

class Cn;
class Expression;
class Object;


/**
 * \class Variables
 * 
 * \ingroup AnalitzaModule
 *
 * \brief Stores the variables in a hash map and make them available.
 */

class ANALITZA_EXPORT Variables : public QHash<QString, Object*>
{
    public:
        /** 
        *    Creates an empty variable hash table with the usual constants
        */
        Variables();
        
        /**
        *    Copy constructor, copies the old one, a bit heavy, be careful.
        */
        Variables(const Variables& v);
        
        /** Destroys the object */
        ~Variables();
        
        /**
        *    Modifies the value of the variable called @p name,
        *    and if didn't exist, a @p name variable is created with an @p o value.
        */
        void modify(const QString& name, const Object* o);
        
        /**
        *    Modifies the value of the variable called @p name,
        *    and if didn't exist, a @p name variable is created with an @p e expression.
        */
        void modify(const QString& name, const Expression& o);
        
        /**
        *    The same as the last one but having @p d as a value for @p name.
        */
        Cn* modify(const QString& name, const double& d);
        
        /**
        *    The @p orig named variable will be called @p dest , then @p orig will be removed.
        */
        void rename(const QString& orig, const QString& dest);
        
        /**
         * Adds again the initial constants
         */
        void initializeConstants();
        
        /** @returns the expression contained by the @p name identifier. */
        Expression valueExpression(const QString& name) const;
         
};

}
#endif
