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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 INCLUDED_XMLOFF_UNIREF_HXX
#define INCLUDED_XMLOFF_UNIREF_HXX
#include <sal/config.h>
#include <xmloff/dllapi.h>
#include <sal/types.h>
#include <osl/interlck.h>
/**
* An instance of this class holds a pointer to an object. The lifetime of
* the object is controlled by the instance. The constructor calls
* acquire() and the destructor calls release().
* You could derive your class from the baseclass UniRefBase which implements
* the methods acquire and release, yet.
*/
template< class T > class UniReference
{
private:
T* mpElement;
public:
/** Create an empty reference.*/
UniReference()
: mpElement( NULL )
{}
/** Destroy the reference and releases the element.*/
inline ~UniReference();
/** Create a new reference with the same element as in rRef and acquire this one.*/
inline UniReference( const UniReference< T > & rRef );
/**
* Create a new reference with the given element pElement and acquire this one.
*/
inline UniReference( T * pElement );
/**
* Release the reference and set the new one pObj.
*/
inline UniReference< T > & operator = ( T * pElement );
/**
* Release the reference and set the new one from rObj.
*/
inline UniReference< T > & operator = ( const UniReference< T > & rRef );
/**
* Return the pointer to the element, may be null.
*/
inline T* operator -> () const;
/**
* Returns true if the pointer to the element is valid.
*/
inline bool is() const;
/**
* Return true if both elements refer to the same object.
*/
inline bool operator == ( const UniReference & rRef ) const;
/**
* Return true if both elements does not refer to the same object.
*/
inline bool operator != ( const UniReference & rRef ) const;
/** Gets implementation pointer.
This call does <b>not</b> acquire the implementation.
<br>
@return <b>un</b>acquired implementation pointer
*/
inline T* get() const;
};
class XMLOFF_DLLPUBLIC UniRefBase
{
private:
/**
* The reference counter.
*/
oslInterlockedCount m_refCount;
public:
UniRefBase() : m_refCount( 0 )
{}
virtual ~UniRefBase();
void acquire() { osl_atomic_increment( &m_refCount ); }
void release();
};
// Inline-implementations of UniReference
/** Create a new reference with the same element as in rRef and acquire this one.*/
template< class T >
inline UniReference< T >::UniReference( const UniReference< T > & rRef )
: mpElement( rRef.mpElement )
{
if( mpElement )
mpElement->acquire();
}
template< class T >
inline UniReference< T >::~UniReference()
{
if( mpElement )
mpElement->release();
}
/**
* Create a new reference with the given element pElement and acquire this one.
* @param pInterface the interface, pointer may be null.
*/
template< class T >
inline UniReference< T >::UniReference( T * pElement )
: mpElement( pElement )
{
if( mpElement )
mpElement->acquire();
}
/**
* Release the reference and set the new one pObj.<BR>
* <B>The operation is not thread save. You must protect all assigns to a reference class.</B>
*/
template< class T >
inline UniReference< T > & UniReference< T >::operator = ( T * pElement )
{
if( pElement )
pElement->acquire();
if( mpElement )
mpElement->release();
mpElement = pElement;
return *this;
}
/**
* Release the reference and set the new one from rObj.<BR>
* <B>The operation is not thread save. You must protect all assigns to a reference class.</B>
*/
template< class T >
inline UniReference< T > & UniReference< T >::operator = ( const UniReference< T > & rRef )
{
return operator = ( rRef.mpElement );
}
/**
* Return the pointer to the interface, may be null.
*/
template< class T >
inline T* UniReference< T >::operator -> () const
{
return get();
}
/**
* Return the pointer to the interface, may be null.
*/
template< class T >
inline T* UniReference< T >::get () const
{
return static_cast< T * >( mpElement );
}
/**
* Returns true if the pointer to the interface is valid.
*/
template< class T >
inline bool UniReference< T >::is() const
{
return (mpElement != 0);
}
/**
* Return true if both interfaces refer to the same object. The operation can be
* much more expensive than a pointer comparison.<BR>
*
* @param rRef another interface reference
*/
template< class T >
inline bool UniReference< T >::operator == ( const UniReference & rRef ) const
{
return ( mpElement == rRef.mpElement );
}
/**
* Return true if both interfaces does not refer to the same object. The operation can be
* much more expensive than a pointer comparison.<BR>
*
* @param rRef another interface reference
*/
template< class T >
inline bool UniReference< T >::operator != ( const UniReference & rRef ) const
{
return ( ! operator == ( rRef ) );
}
#endif // INCLUDED_XMLOFF_UNIREF_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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