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Diffstat (limited to 'src/sql/qsqldriverplugin.cpp')
| -rw-r--r-- | src/sql/qsqldriverplugin.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/sql/qsqldriverplugin.cpp b/src/sql/qsqldriverplugin.cpp new file mode 100644 index 0000000..224c616 --- /dev/null +++ b/src/sql/qsqldriverplugin.cpp @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** Implementation of QSqlDriverPlugin class +** +** Created : 2001-09-20 +** +** Copyright (C) 2001-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the sql module of the Qt 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 Qt Foundation. +** +** Please review the following information to ensure GNU General +** Public Licensing requirements 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.QPL +** included in the packaging of this file. Licensees holding valid Qt +** Commercial licenses may use this file in accordance with the Qt +** 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 QSqlDriverPlugin qsqldriverplugin.h + \brief The QSqlDriverPlugin class provides an abstract base for custom QSqlDriver 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 Qt. + + 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 Qt 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 QStringList QSqlDriverPlugin::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 QSqlDriver* QSqlDriverPlugin::create( const QString& key ) + + Creates and returns a QSqlDriver object for the driver key \a key. + The driver key is usually the class name of the required driver. + + \sa keys() +*/ + +class QSqlDriverPluginPrivate : public QSqlDriverFactoryInterface +{ +public: + QSqlDriverPluginPrivate( QSqlDriverPlugin *p ) + : plugin( p ) + { + } + virtual ~QSqlDriverPluginPrivate(); + + QRESULT queryInterface( const QUuid &iid, QUnknownInterface **iface ); + Q_REFCOUNT; + + QStringList featureList() const; + QSqlDriver *create( const QString &key ); + +private: + QSqlDriverPlugin *plugin; +}; + +QSqlDriverPluginPrivate::~QSqlDriverPluginPrivate() +{ + delete plugin; +} + +QRESULT QSqlDriverPluginPrivate::queryInterface( const QUuid &iid, QUnknownInterface **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 QE_NOINTERFACE; + + (*iface)->addRef(); + return QS_OK; +} + +QStringList QSqlDriverPluginPrivate::featureList() const +{ + return plugin->keys(); +} + +QSqlDriver *QSqlDriverPluginPrivate::create( const QString &key ) +{ + return plugin->create( key ); +} + +/*! + Constructs a SQL driver plugin. This is invoked automatically by + the \c Q_EXPORT_PLUGIN macro. +*/ + +QSqlDriverPlugin::QSqlDriverPlugin() + : QGPlugin( d = new QSqlDriverPluginPrivate( this ) ) +{ +} + +/*! + Destroys the SQL driver plugin. + + You never have to call this explicitly. Qt destroys a plugin + automatically when it is no longer used. +*/ +QSqlDriverPlugin::~QSqlDriverPlugin() +{ + // don't delete d, as this is deleted by d +} + +#endif // QT_NO_COMPONENT +#endif // QT_NO_SQL |