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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#ifndef VBAHELPER_WEAKREFERENCE_HXX
#define VBAHELPER_WEAKREFERENCE_HXX
#include <cppuhelper/weakref.hxx>
#include <rtl/ref.hxx>
namespace vbahelper {
// ============================================================================
/** A weak reference holding any UNO implementation object.
The held object must implement the ::com::sun::star::uno::XWeak interface.
In difference to the ::com::sun::star::uno::WeakReference<> implementation
from cppuhelper/weakref.hxx, the class type of this weak reference is not
restricted to UNO interface types, but can be used for any C++ class type
implementing the XWeak interface somehow (e.g. ::cppu::WeakImplHelperN<>,
::cppu::ImplInheritanceHelperN<>, etc.).
*/
template< typename ObjectType >
class WeakReference
{
public:
/** Default constructor. Creates an empty weak reference.
*/
inline explicit WeakReference() SAL_THROW(()) : mpObject( 0 ) {}
/** Initializes this weak reference with the passed reference to an object.
*/
inline explicit WeakReference( const ::rtl::Reference< ObjectType >& rxObject ) SAL_THROW(()) :
mxWeakRef( rxObject.get() ), mpObject( rxObject.get() ) {}
/** Releases this weak reference and takes over the passed reference.
*/
inline WeakReference& SAL_CALL operator=( const ::rtl::Reference< ObjectType >& rxObject ) SAL_THROW(())
{
mxWeakRef = ::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak >( rxObject.get() );
mpObject = rxObject.get();
return *this;
}
/** Gets an RTL reference to the referenced object.
@return Reference or null, if the weakly referenced object is gone.
*/
inline SAL_CALL operator ::rtl::Reference< ObjectType >() SAL_THROW(())
{
::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak > xRef = mxWeakRef;
::rtl::Reference< ObjectType > xObject;
if( xRef.is() )
xObject = mpObject;
else
mpObject = 0;
return xObject;
}
private:
::com::sun::star::uno::WeakReference< ::com::sun::star::uno::XWeak > mxWeakRef;
ObjectType* mpObject;
};
// ============================================================================
} // namespace vbahelper
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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