elementfactory.h

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/*
    Copyright 2006-2019 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