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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 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;
};
/** 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);
}
} // namespace csv
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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