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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Designer 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 <QtDesigner/default_extensionfactory.h>
+#include "qextensionmanager.h"
+#include <qpointer.h>
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QExtensionFactory
+
+    \brief The QExtensionFactory class allows you to create a factory
+    that is able to make instances of custom extensions in Qt
+    Designer.
+
+    \inmodule QtDesigner
+
+    In \QD the extensions are not created until they are required. For
+    that reason, when implementing a custom extension, you must also
+    create a QExtensionFactory, i.e. a class that is able to make an
+    instance of your extension, and register it using \QD's \l
+    {QExtensionManager}{extension manager}.
+
+    The QExtensionManager class provides extension management
+    facilities for Qt Designer. When an extension is required, Qt
+    Designer's \l {QExtensionManager}{extension manager} will run
+    through all its registered factories calling
+    QExtensionFactory::createExtension() for each until the first one
+    that is able to create a requested extension for the selected
+    object, is found. This factory will then make an instance of the
+    extension.
+
+    There are four available types of extensions in Qt Designer:
+    QDesignerContainerExtension , QDesignerMemberSheetExtension,
+    QDesignerPropertySheetExtension and QDesignerTaskMenuExtension. Qt
+    Designer's behavior is the same whether the requested extension is
+    associated with a multi page container, a member sheet, a property
+    sheet or a task menu.
+
+    You can either create a new QExtensionFactory and reimplement the
+    QExtensionFactory::createExtension() function. For example:
+
+    \snippet doc/src/snippets/code/tools_designer_src_lib_extension_default_extensionfactory.cpp 0
+
+    Or you can use an existing factory, expanding the
+    QExtensionFactory::createExtension() function to make the factory
+    able to create your extension as well. For example:
+
+    \snippet doc/src/snippets/code/tools_designer_src_lib_extension_default_extensionfactory.cpp 1
+
+    For a complete example using the QExtensionFactory class, see the
+    \l {designer/taskmenuextension}{Task Menu Extension example}. The
+    example shows how to create a custom widget plugin for Qt
+    Designer, and how to to use the QDesignerTaskMenuExtension class
+    to add custom items to Qt Designer's task menu.
+
+    \sa QExtensionManager, QAbstractExtensionFactory
+*/
+
+/*!
+    Constructs an extension factory with the given \a parent.
+*/
+QExtensionFactory::QExtensionFactory(QExtensionManager *parent)
+    : QObject(parent)
+{
+}
+
+/*!
+    Returns the extension specified by \a iid for the given \a object.
+
+    \sa createExtension()
+*/
+
+QObject *QExtensionFactory::extension(QObject *object, const QString &iid) const
+{
+    if (!object)
+        return 0;
+    const IdObjectKey key = qMakePair(iid, object);
+
+    ExtensionMap::iterator it = m_extensions.find(key);
+    if (it == m_extensions.end()) {
+        if (QObject *ext = createExtension(object, iid, const_cast<QExtensionFactory*>(this))) {
+            connect(ext, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
+            it = m_extensions.insert(key, ext);
+        }
+    }
+
+    if (!m_extended.contains(object)) {
+        connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
+        m_extended.insert(object, true);
+    }
+
+    if (it == m_extensions.end())
+        return 0;
+
+    return it.value();
+}
+
+void QExtensionFactory::objectDestroyed(QObject *object)
+{
+    QMutableMapIterator< IdObjectKey, QObject*> it(m_extensions);
+    while (it.hasNext()) {
+        it.next();
+
+        QObject *o = it.key().second;
+        if (o == object || object == it.value()) {
+            it.remove();
+        }
+    }
+
+    m_extended.remove(object);
+}
+
+/*!
+    Creates an extension specified by \a iid for the given \a object.
+    The extension object is created as a child of the specified \a
+    parent.
+
+    \sa extension()
+*/
+QObject *QExtensionFactory::createExtension(QObject *object, const QString &iid, QObject *parent) const
+{
+    Q_UNUSED(object);
+    Q_UNUSED(iid);
+    Q_UNUSED(parent);
+
+    return 0;
+}
+
+/*!
+    Returns the extension manager for the extension factory.
+*/
+QExtensionManager *QExtensionFactory::extensionManager() const
+{
+    return static_cast<QExtensionManager *>(parent());
+}
+
+QT_END_NAMESPACE