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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: processor.hxx,v $
* $Revision: 1.3 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef CSV_TPL_PROCESSOR_HXX
#define CSV_TPL_PROCESSOR_HXX
// USED SERVICES
namespace csv
{
/** Implements an acyclic visitor pattern. This is the abstract
base for the classes doing the work (the "visitors").
*/
class ProcessorIfc
{
public:
virtual ~ProcessorIfc() {}
};
/** Implements an acyclic visitor pattern. This is the abstract
base for the classes to be processed (the "visitables").
*/
class ConstProcessorClient
{
public:
virtual ~ConstProcessorClient() {}
void Accept(
ProcessorIfc & io_processor ) const
{ do_Accept(io_processor); }
private:
virtual void do_Accept(
ProcessorIfc & io_processor ) const = 0;
};
/** Implements an acyclic visitor pattern. This is the abstract
base for the classes to be processed (the "visitables").
*/
class ProcessorClient
{
public:
virtual ~ProcessorClient() {}
void Accept(
ProcessorIfc & io_processor )
{ do_Accept(io_processor); }
private:
virtual void do_Accept(
ProcessorIfc & io_processor ) = 0;
};
/** Typed base for "visitor" classes, leaving the visited
object const.
@see ProcessorIfc
@see Processor<>
*/
template <typename X, typename R = void>
class ConstProcessor
{
public:
virtual ~ConstProcessor() {}
R Process(
const X & i_object )
{ return do_Process(i_object ); }
private:
virtual R do_Process(
const X & i_object ) = 0;
};
/** Typed base for "visitor" classes which may change the visited
object.
@see ProcessorIfc
@see ConstProcessor<>
*/
template <typename X, typename R = void>
class Processor
{
public:
virtual ~Processor() {}
R Process(
X & i_object )
{ return do_Process(i_object ); }
private:
virtual R do_Process(
X & i_object ) = 0;
};
template <class C>
inline void
CheckedCall( ProcessorIfc & io_processor,
const C & i_client )
{
ConstProcessor<C> *
pProcessor = dynamic_cast< csv::ConstProcessor<C> * >
(&io_processor);
if (pProcessor != 0)
pProcessor->Process(i_client);
}
template <class C>
inline void
CheckedCall( ProcessorIfc & io_processor,
C & io_client )
{
Processor<C> *
pProcessor = dynamic_cast< csv::Processor<C> * >
(&io_processor);
if (pProcessor != 0)
pProcessor->Process(io_client);
}
template <class C>
inline void
AssertedCall( ProcessorIfc & io_processor,
const C & i_client )
{
ConstProcessor<C> *
pProcessor = dynamic_cast< csv::ConstProcessor<C> * >
(&io_processor);
csv_assert( pProcessor != 0
&& "csv::AssertedCall() failed. Processed object did not match processor." );
pProcessor->Process(i_client);
}
template <class C>
inline void
AssertedCall( ProcessorIfc & io_processor,
C & io_client )
{
Processor<C> *
pProcessor = dynamic_cast< csv::Processor<C> * >
(&io_processor);
csv_assert( pProcessor != 0
&& "csv::AssertedCall() failed. Processed object did not match processor." );
pProcessor->Process(io_client);
}
} // namespace csv
#endif
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