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