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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: accimplaccess.hxx,v $
+ * $Revision: 1.8 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef COMPHELPER_ACCIMPLACCESS_HXX
+#define COMPHELPER_ACCIMPLACCESS_HXX
+
+#include <cppuhelper/implbase1.hxx>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include "comphelper/comphelperdllapi.h"
+
+// forward declaration
+namespace com { namespace sun { namespace star { namespace accessibility {
+    class XAccessible;
+    class XAccessibleContext;
+}}}}
+
+//.........................................................................
+namespace comphelper
+{
+//.........................................................................
+
+    //=====================================================================
+    //= OAccessibleImplementationAccess
+    //=====================================================================
+    typedef ::cppu::ImplHelper1 <   ::com::sun::star::lang::XUnoTunnel
+                                >   OAccImpl_Base;
+    struct OAccImpl_Impl;
+
+    /** This is a helper class which allows accessing several aspects of the the implementation
+        of an AccessibleContext.
+
+        <p>For instance, when you want to implement a context which can be re-parented, you:
+            <ul><li>derive your class from <type>OAccessibleImplementationAccess</type></li>
+                <li>use <code>setAccessibleParent( <em>component</em>, <em>new_parent</em> )</code>
+            </ul>
+        </p>
+
+        <p>Another aspect which can be controlled from the outside are states. If you have a class which
+        has only partial control over it's states, you may consider deriving from OAccessibleImplementationAccess.<br/>
+        For instance, say you have an implementation (say component A) which is <em>unable</em> to know or to
+        determine if the represented object is selected, but another component (say B) which uses A (and integrates
+        it into a tree of accessibility components) is.<br/>
+        In this case, if A is derived from OAccessibleImplementationAccess, B can manipulate this
+        foreign-controlled state flag "SELECTED" by using the static helper methods on this class.</p>
+
+        <p>Please note that the support for foreign controlled states is rather restrictive: You can't have states
+        which <em>may be</em> controlled by a foreign instances. This is implied by the fact that a derived
+        class can ask for states which are <em>set</em> only, not for the ones which are <em>reset</em> currently.
+        </p>
+    */
+    class COMPHELPER_DLLPUBLIC OAccessibleImplementationAccess : public OAccImpl_Base
+    {
+    private:
+        OAccImpl_Impl*  m_pImpl;
+
+    protected:
+        /// retrieves the parent previously set via <method>setAccessibleParent</method>
+        ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >
+                implGetForeignControlledParent( ) const;
+
+        /** retrieves the set of currently set states which are controlled by a foreign instance
+        @return
+            a bit mask, where a set bit 2^n means that the AccessibleStateType n has been set
+        */
+        sal_Int64   implGetForeignControlledStates( ) const;
+
+        /// sets the accessible parent component
+        virtual void    setAccessibleParent(
+            const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >& _rxAccParent );
+
+        /// sets or resets a bit of the foreign controlled states
+        virtual void    setStateBit( const sal_Int16 _nState, const sal_Bool _bSet );
+
+    protected:
+        OAccessibleImplementationAccess( );
+        virtual ~OAccessibleImplementationAccess( );
+
+        // XUnoTunnel
+        virtual sal_Int64 SAL_CALL getSomething( const ::com::sun::star::uno::Sequence< sal_Int8 >& _rIdentifier ) throw (::com::sun::star::uno::RuntimeException);
+
+    public:
+        /** tries to access the implementation of an OAccessibleImplementationAccess derivee which is known as
+            interface only.
+
+        @param _rxComponent
+            is the component which should be examined.
+        @return
+            the pointer to the implementation, if successfull. The only known error condition so far
+            is an invalid context (which means it is <NULL/>, or the implementation is not derived
+            from <type>OAccessibleImplementationAccess</type>, or retrieving the implementation failed).
+        */
+        static OAccessibleImplementationAccess* getImplementation(
+            const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >& _rxComponent
+        );
+
+
+        /** sets the parent for a derived implementation
+
+        @param _rxComponent
+            is the component which's new parent should be set
+        @param _rxNewParent
+            is the new parent of the component
+        @return
+            <TRUE/> in case of success, <FALSE/> otherwise. For error condition please look at
+            <method>getImplementation</method>.
+        */
+        static sal_Bool setAccessibleParent(
+            const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >& _rxComponent,
+            const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >& _rxNewParent
+        );
+
+        /** sets or resets a state bit in the set of foreign-controlled states of the component.
+
+        @param _rxComponent
+            is the component which's state is to be (re)set
+        @param _nState
+            the state bit which should be affected. This should be one of the respective UNO constants.
+        @param _bSet
+            <TRUE/> if the bit should be set, <FALSE/> otherwise
+        @return
+            <TRUE/> in case of success, <FALSE/> otherwise. For error condition please look at
+            <method>getImplementation</method>.
+        */
+        static sal_Bool setForeignControlledState(
+            const ::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >& _rxComponent,
+            const sal_Int16 _nState,
+            const sal_Bool  _bSet
+        );
+
+
+    private:
+        COMPHELPER_DLLPRIVATE static const ::com::sun::star::uno::Sequence< sal_Int8 >& getUnoTunnelImplementationId();
+    };
+
+//.........................................................................
+}   // namespace comphelper
+//.........................................................................
+
+
+#endif // COMPHELPER_ACCIMPLACCESS_HXX
+
+