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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 INCLUDED_UNO_CURRENT_CONTEXT_HXX
      20             : #define INCLUDED_UNO_CURRENT_CONTEXT_HXX
      21             : 
      22             : #include <uno/current_context.h>
      23             : #include <uno/lbnames.h>
      24             : 
      25             : #include <com/sun/star/uno/XCurrentContext.hpp>
      26             : 
      27             : 
      28             : namespace com
      29             : {
      30             : namespace sun
      31             : {
      32             : namespace star
      33             : {
      34             : namespace uno
      35             : {
      36             : 
      37             : /** Getting the current context.
      38             :     @attention
      39             :     Don't spread the returned interface around to other threads.  Every thread has its own
      40             :     current context.
      41             : 
      42             :     @return current context or null ref, if none is set
      43             : */
      44         744 : inline Reference< XCurrentContext > SAL_CALL getCurrentContext()
      45             : {
      46         744 :     Reference< XCurrentContext > xRet;
      47        1488 :     ::rtl::OUString aEnvTypeName( CPPU_CURRENT_LANGUAGE_BINDING_NAME );
      48         744 :     ::uno_getCurrentContext( reinterpret_cast<void **>(&xRet), aEnvTypeName.pData, 0 );
      49        1488 :     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         361 : inline bool SAL_CALL setCurrentContext(
      57             :     Reference< XCurrentContext > const & xContext )
      58             : {
      59         361 :     ::rtl::OUString aEnvTypeName( CPPU_CURRENT_LANGUAGE_BINDING_NAME );
      60         361 :     return (::uno_setCurrentContext( xContext.get(), aEnvTypeName.pData, 0 ) != sal_False);
      61             : }
      62             : 
      63             : /** Objects of this class are used for applying a current context until they are destructed, i.e.
      64             :     the ctor of this class saves the previous and sets the given context while the dtor restores
      65             :     the previous one upon destruction.
      66             : */
      67             : class ContextLayer
      68             : {
      69             :     /** this C++ environment type name.
      70             :     */
      71             :     ::rtl::OUString m_aEnvTypeName;
      72             :     /** previous context
      73             :     */
      74             :     Reference< XCurrentContext > m_xPreviousContext;
      75             : 
      76             : public:
      77             :     /** Constructor: Saves the previous context and sets the new (given) one.
      78             : 
      79             :         @param xNewContext new context to be set
      80             :     */
      81             :     inline ContextLayer(
      82             :         Reference< XCurrentContext > const & xNewContext = Reference< XCurrentContext >() );
      83             :     /** Destructor: restores the previous context.
      84             :     */
      85             :     inline ~ContextLayer();
      86             : 
      87             :     /** Gets the previously set context.
      88             : 
      89             :         @return the previously set context
      90             :     */
      91             :     inline Reference< XCurrentContext > SAL_CALL getPreviousContext() const
      92             :         { return m_xPreviousContext; }
      93             : };
      94             : 
      95         250 : inline ContextLayer::ContextLayer( Reference< XCurrentContext > const & xNewContext )
      96         250 :     : m_aEnvTypeName( CPPU_CURRENT_LANGUAGE_BINDING_NAME )
      97             : {
      98         250 :     ::uno_getCurrentContext( reinterpret_cast<void **>(&m_xPreviousContext), m_aEnvTypeName.pData, 0 );
      99         250 :     ::uno_setCurrentContext( xNewContext.get(), m_aEnvTypeName.pData, 0 );
     100         250 : }
     101             : 
     102         500 : inline ContextLayer::~ContextLayer()
     103             : {
     104         250 :     ::uno_setCurrentContext( m_xPreviousContext.get(), m_aEnvTypeName.pData, 0 );
     105         250 : }
     106             : 
     107             : }
     108             : }
     109             : }
     110             : }
     111             : 
     112             : #endif
     113             : 
     114             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */