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diff --git a/filter/source/config/cache/filterfactory.hxx b/filter/source/config/cache/filterfactory.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 .
+ */
+
+#pragma once
+
+#include "basecontainer.hxx"
+#include "querytokenizer.hxx"
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <cppuhelper/implbase.hxx>
+
+
+namespace filter::config {
+
+
+/** @short      implements the service <type scope="com.sun.star.document">FilterFactory</type>.
+ */
+class FilterFactory : public ::cppu::ImplInheritanceHelper< BaseContainer                   ,
+                                                             css::lang::XMultiServiceFactory >
+{
+
+    // native interface
+
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+    public:
+
+
+        // ctor/dtor
+
+        /** @short  standard ctor to connect this interface wrapper to
+                    the global filter cache instance ...
+
+            @param  rxContext
+                    reference to the uno service manager, which created this service instance.
+         */
+        explicit FilterFactory(const css::uno::Reference< css::uno::XComponentContext >& rxContext);
+
+
+        /** @short  standard dtor.
+         */
+        virtual ~FilterFactory() override;
+
+
+    // uno interface
+
+    public:
+
+
+        // XMultiServiceFactory
+
+        virtual css::uno::Reference< css::uno::XInterface > SAL_CALL createInstance(const OUString& sFilter) override;
+
+        virtual css::uno::Reference< css::uno::XInterface > SAL_CALL createInstanceWithArguments(const OUString&                     sFilter   ,
+                                                                                                 const css::uno::Sequence< css::uno::Any >& lArguments) override;
+
+        virtual css::uno::Sequence< OUString > SAL_CALL getAvailableServiceNames() override;
+
+
+        // XContainerQuery
+
+        virtual css::uno::Reference< css::container::XEnumeration > SAL_CALL createSubSetEnumerationByQuery(const OUString& sQuery) override;
+
+
+    // internal helper!
+
+    private:
+
+
+        /** @short  implement the container string query: "matchByDocumentService=:iflags=:eflags=:..."
+
+            @param  lTokens
+                    the list of query tokens and its values.
+
+            @return A string list of internal filter names, including
+                    all filters, which match this query.
+         */
+        std::vector<OUString> impl_queryMatchByDocumentService(const QueryTokenizer& lTokens) const;
+
+
+        /** TODO document me
+         */
+        static css::uno::Sequence<OUString> impl_getListOfInstalledModules();
+
+
+        /** @short  implement the container string query:
+                    "getSortedFilterList()[:module=<xxx>]:[iflags=<xxx>][:eflags=<xxx>]"
+
+            @param  lTokens
+                    the list of query tokens and its values.
+
+            @return A string list of internal filter names, including
+                    all filters, which match this query.
+         */
+        std::vector<OUString> impl_getSortedFilterList(const QueryTokenizer& lTokens) const;
+
+
+        /** TODO document me
+         */
+        std::vector<OUString> impl_getSortedFilterListForModule(const OUString& sModule,
+                                                             sal_Int32        nIFlags,
+                                                             sal_Int32        nEFlags) const;
+
+
+        /** @short  read a specialized and sorted list of filter names from
+                    the configuration (matching the specified module)
+
+            @param  sModule
+                    the module for which the sorted list should be retrieved for.
+
+            @return A string list of internal filter names.
+                    Can be empty.
+         */
+        static std::vector<OUString> impl_readSortedFilterListFromConfig(const OUString& sModule);
+
+};
+
+} // namespace filter::config
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */