CLAW Library (a C++ Library Absolutely Wonderful) 1.5.5
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00001 /* 00002 CLAW - a C++ Library Absolutely Wonderful 00003 00004 CLAW is a free library without any particular aim but being useful to 00005 anyone. 00006 00007 Copyright (C) 2005-2010 Julien Jorge 00008 00009 This library is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU Lesser General Public 00011 License as published by the Free Software Foundation; either 00012 version 2.1 of the License, or (at your option) any later version. 00013 00014 This library is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public 00020 License along with this library; if not, write to the Free Software 00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 00023 contact: julien_jorge@yahoo.fr 00024 */ 00030 #ifndef __CLAW_FACTORY_HPP__ 00031 #define __CLAW_FACTORY_HPP__ 00032 00033 #include <claw/basic_singleton.hpp> 00034 #include <claw/exception.hpp> 00035 #include <map> 00036 00037 namespace claw 00038 { 00039 namespace pattern 00040 { 00045 class bad_type_identifier: 00046 public exception 00047 { 00048 public: 00052 bad_type_identifier() throw() 00053 : exception("No type has this identifier.") 00054 { } 00055 }; // class bad_type_identifier 00056 00069 template<typename BaseClass, typename IdentifierType> 00070 class factory: 00071 public basic_singleton< factory<BaseClass, IdentifierType> > 00072 { 00073 private: 00078 class class_creator_base 00079 { 00080 public: 00081 virtual ~class_creator_base(); 00082 virtual BaseClass* create() const = 0; 00083 00084 }; // class class_creator_base 00085 00095 template<typename Derived> 00096 class class_creator: 00097 public class_creator_base 00098 { 00099 public: 00100 virtual Derived* create() const; 00101 00102 }; // class class_creator 00103 00105 typedef IdentifierType identifier_type; 00106 00108 typedef BaseClass base_class; 00109 00111 typedef std::map<identifier_type, class_creator_base*> class_map; 00112 00113 public: 00114 ~factory(); 00115 00116 template<typename T> 00117 bool register_type( const identifier_type& id ); 00118 00119 base_class* create( const identifier_type& id ) const; 00120 00121 bool is_known_type( const identifier_type& id ) const; 00122 00123 private: 00125 class_map m_classes; 00126 00127 }; // class factory 00128 00129 } // namespace pattern 00130 } // namespace claw 00131 00132 #include <claw/impl/factory.tpp> 00133 00134 #endif // __CLAW_FACTORY_HPP__