QElectroTech  0.70
elementfactory.h
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1 /*
2  Copyright 2006-2019 The QElectroTech Team
3  This file is part of QElectroTech.
4 
5  QElectroTech is free software: you can redistribute it and/or modify
6  it under the terms of the GNU General Public License as published by
7  the Free Software Foundation, either version 2 of the License, or
8  (at your option) any later version.
9 
10  QElectroTech is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License
16  along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
17 */
18 #ifndef ELEMENTFACTORY_H
19 #define ELEMENTFACTORY_H
20 
21 #include <QMutex>
22 
23 class Element;
24 class ElementsLocation;
25 class QGraphicsItem;
26 
35 {
36  //methods for singleton pattern
37  public:
38  // return instance of factory
40  static QMutex mutex;
41  if (!factory_) {
42  mutex.lock();
43  if (!factory_) factory_ = new ElementFactory();
44  mutex.unlock();
45  }
46  return factory_;
47  }
48 
49  // delete the instance of factory
50  static void dropInstance () {
51  static QMutex mutex;
52  if (factory_) {
53  mutex.lock();
54  delete factory_;
55  factory_ = nullptr;
56  mutex.unlock();
57  }
58  }
59 
60  //attributes
61  private:
63 
64  //methods for the class factory himself
65  private:
70 
71  public:
72  Element *createElement (const ElementsLocation &, QGraphicsItem * = nullptr, int * = nullptr);
73 };
74 //ElementFactory ElementFactory::factory_ = 0;
75 #endif // ELEMENTFACTORY_H
The ElementFactory class this class is a pattern factory and also a singleton factory. this class create new instance of herited class element like simple element or report element.
static void dropInstance()
Element * createElement(const ElementsLocation &, QGraphicsItem *=nullptr, int *=nullptr)
ElementFactory::createElement.
static ElementFactory * factory_
ElementFactory operator=(const ElementFactory &)
static ElementFactory * Instance()