elementfactory.h

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/*
        Copyright 2006-2020 The QElectroTech Team
        This file is part of QElectroTech.
 
        QElectroTech 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.
 
        QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ELEMENTFACTORY_H
#define ELEMENTFACTORY_H
 
#include <QMutex>
 
class Element;
class ElementsLocation;
class QGraphicsItem;
 
class ElementFactory
{
                //methods for singleton pattern
        public:
                        // return instance of factory
                static ElementFactory* Instance() {
                        static QMutex mutex;
                        if (!factory_) {
                                mutex.lock();
                                if (!factory_) factory_ = new ElementFactory();
                                mutex.unlock();
                        }
                        return factory_;
                }
 
                        // delete the instance of factory
                static void dropInstance () {
                        static QMutex mutex;
                        if (factory_) {
                                mutex.lock();
                                delete factory_;
                                factory_ = nullptr;
                                mutex.unlock();
                        }
                }
 
                //attributes
        private:
                static ElementFactory* factory_;
 
                //methods for the class factory himself
        private:
                ElementFactory() {}
                ElementFactory (const ElementFactory &);
                ElementFactory operator= (const ElementFactory &);
                ~ElementFactory() {}
 
        public:
                Element *createElement (const ElementsLocation &, QGraphicsItem * = nullptr, int * = nullptr);
};
//ElementFactory ElementFactory::factory_ = 0;
#endif // ELEMENTFACTORY_H