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diff --git a/i18npool/inc/collator_unicode.hxx b/i18npool/inc/collator_unicode.hxx
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+++ b/i18npool/inc/collator_unicode.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 <com/sun/star/i18n/XCollator.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <osl/module.h>
+
+#include <unicode/tblcoll.h>
+
+//      ----------------------------------------------------
+//      class Collator_Unicode
+//      ----------------------------------------------------
+
+namespace i18npool {
+
+class Collator_Unicode final : public cppu::WeakImplHelper < css::i18n::XCollator, css::lang::XServiceInfo >
+{
+public:
+    // Constructors
+    Collator_Unicode();
+    // Destructor
+    virtual ~Collator_Unicode() override;
+
+    sal_Int32 SAL_CALL compareSubstring( const OUString& s1, sal_Int32 off1, sal_Int32 len1,
+        const OUString& s2, sal_Int32 off2, sal_Int32 len2) override;
+
+    sal_Int32 SAL_CALL compareString( const OUString& s1, const OUString& s2) override;
+
+    sal_Int32 SAL_CALL loadCollatorAlgorithm( const OUString& impl, const css::lang::Locale& rLocale,
+        sal_Int32 collatorOptions) override;
+
+
+    // following 4 methods are implemented in collatorImpl.
+    sal_Int32 SAL_CALL loadDefaultCollator( const css::lang::Locale&,  sal_Int32) override {throw css::uno::RuntimeException();}
+    void SAL_CALL loadCollatorAlgorithmWithEndUserOption( const OUString&, const css::lang::Locale&,
+        const css::uno::Sequence< sal_Int32 >&) override {throw css::uno::RuntimeException();}
+    css::uno::Sequence< OUString > SAL_CALL listCollatorAlgorithms( const css::lang::Locale&) override {throw css::uno::RuntimeException();}
+    css::uno::Sequence< sal_Int32 > SAL_CALL listCollatorOptions( const OUString& ) override {throw css::uno::RuntimeException();}
+
+    //XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+private:
+    std::unique_ptr<icu::RuleBasedCollator> uca_base, collator;
+#ifndef DISABLE_DYNLOADING
+    oslModule hModule;
+#endif
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */