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/****************************************************************************
Copyright (C) 2005 - 2011 Filipe AZEVEDO & The Monkey Studio Team
http://monkeystudio.org licensing under the GNU GPL.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
****************************************************************************/
/*!
\file QSingleton.h
\date 2008-01-14T00:27:37
\author Filipe AZEVEDO aka Nox P\@sNox <pasnox@gmail.com>
\brief Singletonize your QObject class
*/
#ifndef QSINGLETON_H
#define QSINGLETON_H
#include "MonkeyExport.h"
#include <QHash>
#include <QMetaObject>
#include <QApplication>
/*!
\brief Internal hash of instances
\details This class contains unique instance pointer of singletonized classes
*/
class Q_MONKEY_EXPORT QSingletonExpose
{
protected:
static QHash<const QMetaObject*, QObject*> mInstances;
};
/*!
\brief Singletonize your QObject class
\details When heriting this template, you self made your class singletonizable ( unique instance ) ( ie: call like youclass::instance() )
*/
template <class T>
class QSingleton : public QSingletonExpose
{
protected:
QSingleton() {};
virtual ~QSingleton()
{ mInstances.remove( &T::staticMetaObject ); }
public:
template <typename P>
static T* instance( P* pointer );
static T* instance();
static bool instanceAvailable();
static void cleanInstance();
};
/*!
\details Return an unique instance of the class
\param pointer A pointer that is given to constructor of the class
*/
template <class T>
template <typename P>
T* QSingleton<T>::instance( P* pointer )
{
T* t = qobject_cast<T*>( mInstances.value( &T::staticMetaObject ) );
if ( !t )
mInstances[&T::staticMetaObject] = ( t = new T( pointer ) );
return t;
}
/*!
\details Return an unique instance of the class
*/
template <class T>
T* QSingleton<T>::instance()
{
T* t = qobject_cast<T*>( mInstances.value( &T::staticMetaObject ) );
if ( !t )
#ifdef Q_CC_GNU
mInstances[&T::staticMetaObject] = ( t = new T );
#else
mInstances[&T::staticMetaObject] = ( t = new T( 0 ) );
#endif
return t;
}
/*!
\details Return true if an instance of the class already exists, else return false
*/
template <class T>
bool QSingleton<T>::instanceAvailable()
{ return mInstances.contains( &T::staticMetaObject ); }
/*!
\details Clear the instance if instance is available
*/
template <class T>
void QSingleton<T>::cleanInstance()
{
if ( instanceAvailable() )
delete mInstances[ &T::staticMetaObject ];
}
#endif // QSINGLETON_H
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