Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef CSV_TPL_PROCESSOR_HXX
      21             : #define CSV_TPL_PROCESSOR_HXX
      22             : 
      23             : // USED SERVICES
      24             : 
      25             : 
      26             : 
      27             : 
      28             : namespace csv
      29             : {
      30             : 
      31             : 
      32             : /** Implements an acyclic visitor pattern. This is the abstract
      33             :     base for the classes doing the work (the "visitors").
      34             : */
      35           2 : class ProcessorIfc
      36             : {
      37             :   public:
      38           2 :     virtual             ~ProcessorIfc() {}
      39             : };
      40             : 
      41             : 
      42             : 
      43             : /** Implements an acyclic visitor pattern. This is the abstract
      44             :     base for the classes to be processed (the "visitables").
      45             : */
      46       70847 : class ConstProcessorClient
      47             : {
      48             :   public:
      49       65752 :     virtual             ~ConstProcessorClient() {}
      50             : 
      51       23780 :     void                Accept(
      52             :                             ProcessorIfc &  io_processor ) const
      53       23780 :                             { do_Accept(io_processor); }
      54             :   private:
      55             :     virtual void        do_Accept(
      56             :                             ProcessorIfc &  io_processor ) const = 0;
      57             : };
      58             : 
      59             : 
      60             : /** Typed base for "visitor" classes, leaving the visited
      61             :     object const.
      62             : 
      63             :     @see ProcessorIfc
      64             :     @see Processor<>
      65             : */
      66             : template <typename X, typename R = void>
      67          22 : class ConstProcessor
      68             : {
      69             :   public:
      70          22 :     virtual             ~ConstProcessor() {}
      71             : 
      72       18094 :     R                   Process(
      73             :                             const X &           i_object )
      74       18094 :                         { return do_Process(i_object ); }
      75             :  private:
      76             :     virtual R           do_Process(
      77             :                             const X &           i_object ) = 0;
      78             : };
      79             : 
      80             : 
      81             : /** Typed base for "visitor" classes which may change the visited
      82             :     object.
      83             : 
      84             :     @see ProcessorIfc
      85             :     @see ConstProcessor<>
      86             : */
      87             : template <typename X, typename R = void>
      88             : class Processor
      89             : {
      90             :   public:
      91             :     virtual             ~Processor() {}
      92             : 
      93             :     R                   Process(
      94             :                             X &                 i_object )
      95             :                         { return do_Process(i_object ); }
      96             :  private:
      97             :     virtual R           do_Process(
      98             :                             X &                 i_object ) = 0;
      99             : };
     100             : 
     101             : 
     102             : template <class C>
     103             : inline void
     104       23780 : CheckedCall( ProcessorIfc &  io_processor,
     105             :              const C &       i_client )
     106             : {
     107             :     ConstProcessor<C> *
     108             :         pProcessor = dynamic_cast< csv::ConstProcessor<C> * >
     109       23780 :                         (&io_processor);
     110       23780 :     if (pProcessor != 0)
     111       18094 :         pProcessor->Process(i_client);
     112       23780 : }
     113             : 
     114             : template <class C>
     115             : inline void
     116             : CheckedCall( ProcessorIfc &  io_processor,
     117             :              C &             io_client )
     118             : {
     119             :     Processor<C> *
     120             :         pProcessor = dynamic_cast< csv::Processor<C> * >
     121             :                         (&io_processor);
     122             :     if (pProcessor != 0)
     123             :         pProcessor->Process(io_client);
     124             : }
     125             : 
     126             : }   // namespace csv
     127             : #endif
     128             : 
     129             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */