/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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 * 
 *************************************************************/


#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