src/apps/cortex/Persistence/XMLElementMapping.h

   1 /*
   2  * Copyright (c) 1999-2000, Eric Moon.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions, and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  27  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31
  32 // XMLElementMapping.h
  33 // * PURPOSE
  34 //   A simple class (template implementing a non-template
  35 //   base interface) to encapsulate the operation:
  36 //   "make an object for this XML element."
  37 //
  38 // * HISTORY
  39 //   e.moon             04oct99         Begun.
  40
  41 #ifndef __XMLElementMapping_H__
  42 #define __XMLElementMapping_H__
  43
  44 #include <functional>
  45 #include <String.h>
  46
  47 #include "cortex_defs.h"
  48 __BEGIN_CORTEX_NAMESPACE
  49
  50 class IPersistent;
  51
  52 // The base class:
  53
  54 class XMLElementMapping {
  55 public:                                                                                                 // *** data
  56         const BString                                                                   element;
  57
  58 public:                                                                                                 // *** interface
  59         virtual ~XMLElementMapping() {}
  60         XMLElementMapping(
  61                 const char*                                                                     _element) :
  62                 element(_element) {}
  63
  64         virtual IPersistent* create() const =0;
  65 };
  66
  67 // The template:
  68
  69 template <class T>
  70 class Mapping :
  71         public  XMLElementMapping {
  72 public:
  73         virtual ~Mapping() {}
  74         Mapping(
  75                 const char*                                                                     element) :
  76                 XMLElementMapping(element) {}
  77
  78         IPersistent* create() const {
  79                 return new T();
  80         }
  81 };
  82
  83 // compare pointers to Mappings by element name
  84 struct _mapping_ptr_less : public std::binary_function<XMLElementMapping*,XMLElementMapping*,bool> {
  85 public:
  86         bool operator()(const XMLElementMapping* a, const XMLElementMapping* b) const {
  87                 return a->element < b->element;
  88         }
  89 };
  90
  91
  92 __END_CORTEX_NAMESPACE
  93 #endif /*__XMLElementMapping_H__*/