/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: current_context.hxx,v $
 *
 *  $Revision: 1.9 $
 *
 *  last change: $Author: hr $ $Date: 2006/01/24 16:44:11 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library 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 for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/
#ifndef _UNO_CURRENT_CONTEXT_HXX_
#define _UNO_CURRENT_CONTEXT_HXX_

#include <uno/current_context.h>

#include <com/sun/star/uno/XCurrentContext.hpp>


namespace com
{     
namespace sun
{     
namespace star
{     
namespace uno
{

/** Getting the current context.
	@attention
    Don't spread the returned interface around to other threads.  Every thread has its own
    current context.
    
    @return current context or null ref, if none is set
*/
inline Reference< XCurrentContext > SAL_CALL getCurrentContext()
    SAL_THROW( () )
{
	Reference< XCurrentContext > xRet;
	::rtl::OUString aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) );	
	::uno_getCurrentContext( (void **)&xRet, aEnvTypeName.pData, 0 );
	return xRet;
}
/** Setting the current context.

    @param xContext current context to be set
    @return true, if context has been successfully set
*/
inline bool SAL_CALL setCurrentContext(
    Reference< XCurrentContext > const & xContext )
    SAL_THROW( () )
{
	::rtl::OUString aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) );
	return (::uno_setCurrentContext( xContext.get(), aEnvTypeName.pData, 0 ) != sal_False);
}

/** Objects of this class are used for applying a current context until they are destructed, i.e.
    the ctor of this class saves the previous and sets the given context while the dtor restores
    the previous one upon destruction.
*/
class ContextLayer
{
    /** this C++ environment type name.
        @internal
    */
    ::rtl::OUString m_aEnvTypeName;
    /** previous context
        @internal
    */
    Reference< XCurrentContext > m_xPreviousContext;
    
public:
    /** Constructor: Saves the previous context and sets the new (given) one.
        
        @param xNewContext new context to be set
    */
    inline ContextLayer(
        Reference< XCurrentContext > const & xNewContext = Reference< XCurrentContext >() )
        SAL_THROW( () );
    /** Destructor: restores the previous context.
    */
    inline ~ContextLayer() SAL_THROW( () );
    
    /** Gets the previously set context.
        
        @return the previously set context
    */
    inline Reference< XCurrentContext > SAL_CALL getPreviousContext() const
        SAL_THROW( () )
        { return m_xPreviousContext; }
};
//__________________________________________________________________________________________________
inline ContextLayer::ContextLayer( Reference< XCurrentContext > const & xNewContext )
    SAL_THROW( () )
    : m_aEnvTypeName( RTL_CONSTASCII_USTRINGPARAM(CPPU_CURRENT_LANGUAGE_BINDING_NAME) )
{
	::uno_getCurrentContext( (void **)&m_xPreviousContext, m_aEnvTypeName.pData, 0 );
	::uno_setCurrentContext( xNewContext.get(), m_aEnvTypeName.pData, 0 );
}
//__________________________________________________________________________________________________
inline ContextLayer::~ContextLayer()
    SAL_THROW( () )
{
	::uno_setCurrentContext( m_xPreviousContext.get(), m_aEnvTypeName.pData, 0 );
}

}
}
}
}

#endif
