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diff --git a/desktop/source/migration/services/oo3extensionmigration.hxx b/desktop/source/migration/services/oo3extensionmigration.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_DESKTOP_SOURCE_MIGRATION_SERVICES_OO3EXTENSIONMIGRATION_HXX
+#define INCLUDED_DESKTOP_SOURCE_MIGRATION_SERVICES_OO3EXTENSIONMIGRATION_HXX
+
+#include "misc.hxx"
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/task/XJob.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/xml/dom/XDocumentBuilder.hpp>
+#include <com/sun/star/ucb/XSimpleFileAccess3.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+#include <com/sun/star/ucb/XProgressHandler.hpp>
+
+#include <osl/mutex.hxx>
+#include <cppuhelper/implbase.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+class INetURLObject;
+
+
+namespace migration
+{
+
+    OUString OO3ExtensionMigration_getImplementationName();
+    css::uno::Sequence< OUString > OO3ExtensionMigration_getSupportedServiceNames();
+    css::uno::Reference< css::uno::XInterface > OO3ExtensionMigration_create(
+        css::uno::Reference< css::uno::XComponentContext > const & xContext );
+
+
+
+
+    typedef ::cppu::WeakImplHelper<
+        css::lang::XServiceInfo,
+        css::lang::XInitialization,
+        css::task::XJob > ExtensionMigration_BASE;
+
+    class OO3ExtensionMigration : public ExtensionMigration_BASE
+    {
+    private:
+        css::uno::Reference< css::uno::XComponentContext >      m_ctx;
+        css::uno::Reference< css::xml::dom::XDocumentBuilder >  m_xDocBuilder;
+        css::uno::Reference< css::ucb::XSimpleFileAccess3 >     m_xSimpleFileAccess;
+        ::osl::Mutex            m_aMutex;
+        OUString                m_sSourceDir;
+        OUString                m_sTargetDir;
+        TStringVector           m_aBlackList;
+
+        enum ScanResult
+        {
+            SCANRESULT_NOTFOUND,
+            SCANRESULT_MIGRATE_EXTENSION,
+            SCANRESULT_DONTMIGRATE_EXTENSION
+        };
+
+        ScanResult              scanExtensionFolder( const OUString& sExtFolder );
+        void                    scanUserExtensions( const OUString& sSourceDir, TStringVector& aMigrateExtensions );
+        bool                    scanDescriptionXml( const OUString& sDescriptionXmlFilePath );
+        void                    migrateExtension( const OUString& sSourceDir );
+
+    public:
+        explicit OO3ExtensionMigration(css::uno::Reference<
+            css::uno::XComponentContext > const & ctx);
+        virtual ~OO3ExtensionMigration() override;
+
+        // XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+        virtual sal_Bool SAL_CALL supportsService( const OUString& rServiceName ) override;
+        virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+        // XInitialization
+        virtual void SAL_CALL initialize( const css::uno::Sequence< css::uno::Any >& aArguments ) override;
+
+        // XJob
+        virtual css::uno::Any SAL_CALL execute(
+            const css::uno::Sequence< css::beans::NamedValue >& Arguments ) override;
+    };
+
+    class TmpRepositoryCommandEnv
+        : public ::cppu::WeakImplHelper< css::ucb::XCommandEnvironment,
+                                          css::task::XInteractionHandler,
+                                          css::ucb::XProgressHandler >
+    {
+    public:
+        virtual ~TmpRepositoryCommandEnv() override;
+        TmpRepositoryCommandEnv();
+
+        // XCommandEnvironment
+        virtual css::uno::Reference< css::task::XInteractionHandler > SAL_CALL
+        getInteractionHandler() override;
+        virtual css::uno::Reference< css::ucb::XProgressHandler >
+        SAL_CALL getProgressHandler() override;
+
+        // XInteractionHandler
+        virtual void SAL_CALL handle(
+            css::uno::Reference< css::task::XInteractionRequest > const & xRequest ) override;
+
+        // XProgressHandler
+        virtual void SAL_CALL push( css::uno::Any const & Status ) override;
+        virtual void SAL_CALL update( css::uno::Any const & Status ) override;
+        virtual void SAL_CALL pop() override;
+    };
+
+
+}   // namespace migration
+
+
+#endif // INCLUDED_DESKTOP_SOURCE_MIGRATION_SERVICES_OO3EXTENSIONMIGRATION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */