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/****************************************************************************
**
** Implementation of TQSqlDriverPlugin class
**
** Created : 2001-09-20
**
** Copyright (C) 2001-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the sql module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing retquirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qsqldriverplugin.h"
#ifndef QT_NO_SQL
#ifndef QT_NO_COMPONENT
#include "qsqldriverinterface_p.h"
/*!
\class TQSqlDriverPlugin qsqldriverplugin.h
\brief The TQSqlDriverPlugin class provides an abstract base for custom TQSqlDriver plugins.
\ingroup plugins
\mainclass
The SQL driver plugin is a simple plugin interface that makes it
easy to create your own SQL driver plugins that can be loaded
dynamically by TQt.
Writing a SQL plugin is achieved by subclassing this base class,
reimplementing the pure virtual functions keys() and create(), and
exporting the class with the \c Q_EXPORT_PLUGIN macro. See the SQL
plugins that come with TQt for example implementations (in the
\c{plugins/src/sqldrivers} subdirectory of the source
distribution). Read the \link plugins-howto.html plugins
documentation\endlink for more information on plugins.
*/
/*!
\fn TQStringList TQSqlDriverPlugin::keys() const
Returns the list of drivers (keys) this plugin supports.
These keys are usually the class names of the custom drivers that
are implemented in the plugin.
\sa create()
*/
/*!
\fn TQSqlDriver* TQSqlDriverPlugin::create( const TQString& key )
Creates and returns a TQSqlDriver object for the driver key \a key.
The driver key is usually the class name of the retquired driver.
\sa keys()
*/
class TQSqlDriverPluginPrivate : public TQSqlDriverFactoryInterface
{
public:
TQSqlDriverPluginPrivate( TQSqlDriverPlugin *p )
: plugin( p )
{
}
virtual ~TQSqlDriverPluginPrivate();
TQRESULT queryInterface( const TQUuid &iid, TQUnknownInterface **iface );
Q_REFCOUNT;
TQStringList featureList() const;
TQSqlDriver *create( const TQString &key );
private:
TQSqlDriverPlugin *plugin;
};
TQSqlDriverPluginPrivate::~TQSqlDriverPluginPrivate()
{
delete plugin;
}
TQRESULT TQSqlDriverPluginPrivate::queryInterface( const TQUuid &iid, TQUnknownInterface **iface )
{
*iface = 0;
if ( iid == IID_QUnknown )
*iface = this;
else if ( iid == IID_QFeatureList )
*iface = this;
else if ( iid == IID_QSqlDriverFactory )
*iface = this;
else
return TQE_NOINTERFACE;
(*iface)->addRef();
return TQS_OK;
}
TQStringList TQSqlDriverPluginPrivate::featureList() const
{
return plugin->keys();
}
TQSqlDriver *TQSqlDriverPluginPrivate::create( const TQString &key )
{
return plugin->create( key );
}
/*!
Constructs a SQL driver plugin. This is invoked automatically by
the \c Q_EXPORT_PLUGIN macro.
*/
TQSqlDriverPlugin::TQSqlDriverPlugin()
: TQGPlugin( d = new TQSqlDriverPluginPrivate( this ) )
{
}
/*!
Destroys the SQL driver plugin.
You never have to call this explicitly. TQt destroys a plugin
automatically when it is no longer used.
*/
TQSqlDriverPlugin::~TQSqlDriverPlugin()
{
// don't delete d, as this is deleted by d
}
#endif // QT_NO_COMPONENT
#endif // QT_NO_SQL
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