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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlmoduleplugin.h"
+#include "qstringlist.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QmlModulePlugin
+    \brief The QmlModulePlugin class provides an abstract base for custom QML module plugins.
+    \reentrant
+    \ingroup plugins
+
+    The QML module plugin is a simple plugin interface that makes it
+    easy to add custom QML modules that can be loaded dynamically
+    into applications.
+
+    Writing a QML module plugin is achieved by subclassing this base
+    class, reimplementing the pure virtual function keys(), and
+    exporting the class with the Q_EXPORT_PLUGIN2() macro. See \l{How
+    to Create Qt Plugins} for details.
+
+    The strings returned by keys() should be the list of URIs of modules
+    that the plugin registers.
+
+    The plugin should register QML types with qmlRegisterType() when the
+    defineModule() method is called.
+
+    \sa examples/declarative/plugins
+*/
+
+/*!
+    Constructs a QML module plugin with the given \a parent. This is
+    invoked automatically by the Q_EXPORT_PLUGIN2() macro.
+*/
+QmlModulePlugin::QmlModulePlugin(QObject *parent)
+    : QObject(parent)
+{
+}
+
+/*!
+    Destroys the QML module plugin.
+
+    You never have to call this explicitly. Qt destroys a plugin
+    automatically when it is no longer used.
+*/
+QmlModulePlugin::~QmlModulePlugin()
+{
+}
+
+/*!
+    \fn void QmlModulePlugin::defineModule(const QString& uri)
+
+    Subclasses must override this function to register types
+    of the module \a uri, which will be one of the strings returned by keys().
+
+    The plugin registers QML types with qmlRegisterType():
+
+    \code
+        qmlRegisterType<MyClass>("com.nokia.MyModule", 1, 0, "MyType", "MyClass");
+    \endcode
+*/
+
+void QmlModulePlugin::defineModuleOnce(const QString& uri)
+{ 
+    if (!defined.contains(uri)) {
+        defined += uri;
+        defineModule(uri);
+    }
+}
+
+QT_END_NAMESPACE