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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : #ifndef _UNO_CURRENT_CONTEXT_HXX_
      20             : #define _UNO_CURRENT_CONTEXT_HXX_
      21             : 
      22             : #include <uno/current_context.h>
      23             : 
      24             : #include <com/sun/star/uno/XCurrentContext.hpp>
      25             : 
      26             : 
      27             : namespace com
      28             : {
      29             : namespace sun
      30             : {
      31             : namespace star
      32             : {
      33             : namespace uno
      34             : {
      35             : 
      36             : /** Getting the current context.
      37             :     @attention
      38             :     Don't spread the returned interface around to other threads.  Every thread has its own
      39             :     current context.
      40             : 
      41             :     @return current context or null ref, if none is set
      42             : */
      43          36 : inline Reference< XCurrentContext > SAL_CALL getCurrentContext()
      44             :     SAL_THROW(())
      45             : {
      46          36 :     Reference< XCurrentContext > xRet;
      47          36 :     ::rtl::OUString aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) );
      48          36 :     ::uno_getCurrentContext( (void **)&xRet, aEnvTypeName.pData, 0 );
      49          36 :     return xRet;
      50             : }
      51             : /** Setting the current context.
      52             : 
      53             :     @param xContext current context to be set
      54             :     @return true, if context has been successfully set
      55             : */
      56          32 : inline bool SAL_CALL setCurrentContext(
      57             :     Reference< XCurrentContext > const & xContext )
      58             :     SAL_THROW(())
      59             : {
      60          32 :     ::rtl::OUString aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) );
      61          32 :     return (::uno_setCurrentContext( xContext.get(), aEnvTypeName.pData, 0 ) != sal_False);
      62             : }
      63             : 
      64             : /** Objects of this class are used for applying a current context until they are destructed, i.e.
      65             :     the ctor of this class saves the previous and sets the given context while the dtor restores
      66             :     the previous one upon destruction.
      67             : */
      68             : class ContextLayer
      69             : {
      70             :     /** this C++ environment type name.
      71             :     */
      72             :     ::rtl::OUString m_aEnvTypeName;
      73             :     /** previous context
      74             :     */
      75             :     Reference< XCurrentContext > m_xPreviousContext;
      76             : 
      77             : public:
      78             :     /** Constructor: Saves the previous context and sets the new (given) one.
      79             : 
      80             :         @param xNewContext new context to be set
      81             :     */
      82             :     inline ContextLayer(
      83             :         Reference< XCurrentContext > const & xNewContext = Reference< XCurrentContext >() )
      84             :         SAL_THROW(());
      85             :     /** Destructor: restores the previous context.
      86             :     */
      87             :     inline ~ContextLayer() SAL_THROW(());
      88             : 
      89             :     /** Gets the previously set context.
      90             : 
      91             :         @return the previously set context
      92             :     */
      93             :     inline Reference< XCurrentContext > SAL_CALL getPreviousContext() const
      94             :         SAL_THROW(())
      95             :         { return m_xPreviousContext; }
      96             : };
      97             : //__________________________________________________________________________________________________
      98           4 : inline ContextLayer::ContextLayer( Reference< XCurrentContext > const & xNewContext )
      99             :     SAL_THROW(())
     100           4 :     : m_aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) )
     101             : {
     102           4 :     ::uno_getCurrentContext( (void **)&m_xPreviousContext, m_aEnvTypeName.pData, 0 );
     103           4 :     ::uno_setCurrentContext( xNewContext.get(), m_aEnvTypeName.pData, 0 );
     104           4 : }
     105             : //__________________________________________________________________________________________________
     106           8 : inline ContextLayer::~ContextLayer()
     107             :     SAL_THROW(())
     108             : {
     109           4 :     ::uno_setCurrentContext( m_xPreviousContext.get(), m_aEnvTypeName.pData, 0 );
     110           4 : }
     111             : 
     112             : }
     113             : }
     114             : }
     115             : }
     116             : 
     117             : #endif
     118             : 
     119             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */