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diff --git a/unotools/source/accessibility/accessiblestatesethelper.cxx b/unotools/source/accessibility/accessiblestatesethelper.cxx
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+++ b/unotools/source/accessibility/accessiblestatesethelper.cxx
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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 .
+ */
+
+#include <unotools/accessiblestatesethelper.hxx>
+#include <tools/debug.hxx>
+
+// defines how many states the bitfield can contain
+// it has the size of 64 because I use a uInt64
+#define BITFIELDSIZE 64
+
+using namespace ::utl;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::accessibility;
+
+class AccessibleStateSetHelperImpl
+{
+public:
+    AccessibleStateSetHelperImpl();
+    AccessibleStateSetHelperImpl(const AccessibleStateSetHelperImpl& rImpl);
+
+    /// @throws uno::RuntimeException
+    bool IsEmpty () const;
+    /// @throws uno::RuntimeException
+    bool Contains (sal_Int16 aState) const;
+    /// @throws uno::RuntimeException
+    uno::Sequence<sal_Int16> GetStates() const;
+    /// @throws uno::RuntimeException
+    void AddState(sal_Int16 aState);
+    /// @throws uno::RuntimeException
+    void RemoveState(sal_Int16 aState);
+
+    inline void AddStates( const sal_Int64 _nStates );
+
+private:
+    sal_uInt64 maStates;
+};
+
+AccessibleStateSetHelperImpl::AccessibleStateSetHelperImpl()
+    : maStates(0)
+{
+}
+
+AccessibleStateSetHelperImpl::AccessibleStateSetHelperImpl(const AccessibleStateSetHelperImpl& rImpl)
+    : maStates(rImpl.maStates)
+{
+}
+
+inline bool AccessibleStateSetHelperImpl::IsEmpty () const
+{
+    return maStates == 0;
+}
+
+inline bool AccessibleStateSetHelperImpl::Contains (sal_Int16 aState) const
+{
+    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
+    sal_uInt64 aTempBitSet(1);
+    aTempBitSet <<= aState;
+    return ((aTempBitSet & maStates) != 0);
+}
+
+inline uno::Sequence<sal_Int16> AccessibleStateSetHelperImpl::GetStates() const
+{
+    uno::Sequence<sal_Int16> aRet(BITFIELDSIZE);
+    sal_Int16* pSeq = aRet.getArray();
+    sal_Int16 nStateCount(0);
+    for (sal_Int16 i = 0; i < BITFIELDSIZE; ++i)
+        if (Contains(i))
+        {
+            *pSeq = i;
+            ++pSeq;
+            ++nStateCount;
+        }
+    aRet.realloc(nStateCount);
+    return aRet;
+}
+
+inline void AccessibleStateSetHelperImpl::AddStates( const sal_Int64 _nStates )
+{
+    maStates |= _nStates;
+}
+
+inline void AccessibleStateSetHelperImpl::AddState(sal_Int16 aState)
+{
+    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
+    sal_uInt64 aTempBitSet(1);
+    aTempBitSet <<= aState;
+    maStates |= aTempBitSet;
+}
+
+inline void AccessibleStateSetHelperImpl::RemoveState(sal_Int16 aState)
+{
+    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
+    sal_uInt64 aTempBitSet(1);
+    aTempBitSet <<= aState;
+    aTempBitSet = ~aTempBitSet;
+    maStates &= aTempBitSet;
+}
+
+//=====  internal  ============================================================
+
+AccessibleStateSetHelper::AccessibleStateSetHelper ()
+    : mpHelperImpl(new AccessibleStateSetHelperImpl)
+{
+}
+
+AccessibleStateSetHelper::AccessibleStateSetHelper ( const sal_Int64 _nInitialStates )
+    : mpHelperImpl(new AccessibleStateSetHelperImpl)
+{
+    mpHelperImpl->AddStates( _nInitialStates );
+}
+
+AccessibleStateSetHelper::AccessibleStateSetHelper (const AccessibleStateSetHelper& rHelper)
+    : cppu::WeakImplHelper<XAccessibleStateSet>(rHelper)
+{
+    if (rHelper.mpHelperImpl)
+        mpHelperImpl.reset(new AccessibleStateSetHelperImpl(*rHelper.mpHelperImpl));
+    else
+        mpHelperImpl.reset(new AccessibleStateSetHelperImpl());
+}
+
+AccessibleStateSetHelper::~AccessibleStateSetHelper()
+{
+}
+
+//=====  XAccessibleStateSet  ==============================================
+
+    /** Checks whether the current state set is empty.
+
+        @return
+            Returns <TRUE/> if there is no state in this state set and
+            <FALSE/> if there is at least one state set in it.
+    */
+sal_Bool SAL_CALL AccessibleStateSetHelper::isEmpty ()
+{
+    osl::MutexGuard aGuard (maMutex);
+    return mpHelperImpl->IsEmpty();
+}
+
+    /** Checks if the given state is a member of the state set of this
+        object.
+
+        @param aState
+            The state for which to check membership.  This has to be one of
+            the constants of <type>AccessibleStateType</type>.
+
+        @return
+            Returns <TRUE/> if the given state is a member of this object's
+            state set and <FALSE/> otherwise.
+    */
+sal_Bool SAL_CALL AccessibleStateSetHelper::contains (sal_Int16 aState)
+{
+    osl::MutexGuard aGuard (maMutex);
+    return mpHelperImpl->Contains(aState);
+}
+
+    /** Checks if all of the given states are in this object's state
+        set.
+
+        @param aStateSet
+            This sequence of states is interpreted as set and every of its
+            members, duplicates are ignored, is checked for membership in
+            this object's state set.  Each state has to be one of the
+            constants of <type>AccessibleStateType</type>.
+
+        @return
+            Returns <TRUE/> if all states of the given state set are members
+            of this object's state set.  <FALSE/> is returned if at least
+            one of the states in the given state is not a member of this
+            object's state set.
+    */
+sal_Bool SAL_CALL AccessibleStateSetHelper::containsAll
+    (const uno::Sequence<sal_Int16>& rStateSet)
+{
+    osl::MutexGuard aGuard (maMutex);
+    return std::all_of(rStateSet.begin(), rStateSet.end(),
+        [this](const sal_Int16 nState) { return mpHelperImpl->Contains(nState); });
+}
+
+uno::Sequence<sal_Int16> SAL_CALL AccessibleStateSetHelper::getStates()
+{
+    osl::MutexGuard aGuard(maMutex);
+    return mpHelperImpl->GetStates();
+}
+
+void AccessibleStateSetHelper::AddState(sal_Int16 aState)
+{
+    osl::MutexGuard aGuard (maMutex);
+    mpHelperImpl->AddState(aState);
+}
+
+void AccessibleStateSetHelper::RemoveState(sal_Int16 aState)
+{
+    osl::MutexGuard aGuard (maMutex);
+    mpHelperImpl->RemoveState(aState);
+}
+
+//=====  XTypeProvider  =======================================================
+
+uno::Sequence< css::uno::Type> AccessibleStateSetHelper::getTypes()
+{
+    css::uno::Sequence< css::uno::Type> aTypeSequence {
+        cppu::UnoType<XAccessibleStateSet>::get(),
+        cppu::UnoType<lang::XTypeProvider>::get()
+    };
+    return aTypeSequence;
+}
+
+uno::Sequence<sal_Int8> SAL_CALL AccessibleStateSetHelper::getImplementationId()
+{
+    return css::uno::Sequence<sal_Int8>();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */