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00001 
00007 /* Copyright, 2000 Nevrax Ltd.
00008  *
00009  * This file is part of NEVRAX NEL.
00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
00011  * it under the terms of the GNU General Public License as published by
00012  * the Free Software Foundation; either version 2, or (at your option)
00013  * any later version.
00014 
00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00018  * General Public License for more details.
00019 
00020  * You should have received a copy of the GNU General Public License
00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00023  * MA 02111-1307, USA.
00024  */
00025 
00026 #ifndef NL_CLASS_REGISTRY_H
00027 #define NL_CLASS_REGISTRY_H
00028 
00029 #include        "nel/misc/types_nl.h"
00030 #include        "nel/misc/common.h"
00031 #include        <typeinfo>
00032 #include        <string>
00033 #include        <set>
00034 
00035 
00036 namespace       NLMISC
00037 {
00038 
00039 
00040 // ======================================================================================================
00047 struct ERegistry : public Exception
00048 {
00049         ERegistry() : Exception( "Registry error" ) {};
00050 
00051         ERegistry( const std::string& str ) : Exception( str ) {};
00052 };
00053 
00054 struct ERegisteredClass : public ERegistry
00055 {
00056         ERegisteredClass() : ERegistry( "Class already registered" ) {};
00057 };
00058 
00059 struct EUnregisteredClass : public ERegistry
00060 {
00061         EUnregisteredClass() : ERegistry( "Class not registered" ) {}
00062         EUnregisteredClass(const std::string &className) : ERegistry( std::string("Class not registered : ") + className ) {}
00063 };
00064 
00065 
00066 // ======================================================================================================
00073 class IClassable
00074 {
00075 public:
00076         virtual std::string             getClassName() =0;
00077 };
00078 
00079 
00080 // ======================================================================================================
00087 class CClassRegistry
00088 {
00089 public:
00090 
00092         static  void            registerClass(const std::string &className, IClassable* (*creator)(), const std::string &typeidCheck) throw(ERegistry);
00093 
00095         static  IClassable      *create(const std::string &className) throw(ERegistry);
00096 
00098         static  bool            checkObject(IClassable* obj);
00099 
00100 
00101 private:
00102         struct  CClassNode
00103         {
00104                 std::string                     ClassName;
00105                 std::string                     TypeIdCheck;
00106                 IClassable*     (*Creator)();
00107                 bool    operator<(const CClassNode &n) const
00108                 {
00109                         return ClassName<n.ClassName;
00110                 }
00111         };
00112         static  std::set<CClassNode>            *RegistredClasses;
00113 
00115         static void                     init();
00116 };
00117 
00118 
00120 #define NLMISC_DECLARE_CLASS(_class_)                                   \
00121         virtual std::string     getClassName() {return #_class_;}               \
00122         static  NLMISC::IClassable      *creator() {return new _class_;}
00123 #define NLMISC_REGISTER_CLASS(_class_) NLMISC::CClassRegistry::registerClass(#_class_, _class_::creator, typeid(_class_).name());
00124 
00125 
00126 
00127 }       // namespace NLMISC.
00128 
00129 
00130 #endif // NL_STREAM_H
00131 
00132 /* End of stream.h */
class_registry.h
