src/common/engine/MetaClass.h

   1 ////////////////////////////////////////////////////////////////////////////////
   2 //    Scorched3D (c) 2000-2009
   3 //
   4 //    This file is part of Scorched3D.
   5 //
   6 //    Scorched3D is free software; you can redistribute it and/or modify
   7 //    it under the terms of the GNU General Public License as published by
   8 //    the Free Software Foundation; either version 2 of the License, or
   9 //    (at your option) any later version.
  10 //
  11 //    Scorched3D is distributed in the hope that it will be useful,
  12 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //    GNU General Public License for more details.
  15 //
  16 //    You should have received a copy of the GNU General Public License
  17 //    along with Scorched3D; if not, write to the Free Software
  18 //    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 ////////////////////////////////////////////////////////////////////////////////
  20
  21 #if !defined(__INCLUDE_MetaClassh_INCLUDE__)
  22 #define __INCLUDE_MetaClassh_INCLUDE__
  23
  24 #include <string>
  25 #include <map>
  26
  27 #define REGISTER_CLASS_HEADER(x) \
  28 \
  29 class METAFACTORY_##x : public MetaClassFactory \
  30 { \
  31         virtual MetaClass *getClassCopy() { return new x ; } \
  32 }; \
  33 virtual const char *getClassName() { return #x ; } \
  34 virtual unsigned int getMetaClassId() \
  35 { \
  36         static unsigned int metaClassID = nextMetaClassId_++; return metaClassID; \
  37 }
  38
  39 #define REGISTER_CLASS_SOURCE(x) \
  40         struct META_##x { META_##x() { MetaClassRegistration::addMap(#x , new x::METAFACTORY_##x ); } }; \
  41         static META_##x META_IMPL_##x ;
  42
  43 class MetaClass
  44 {
  45 public:
  46         MetaClass();
  47         virtual ~MetaClass();
  48
  49         // Automatically given by the
  50         // REGISTER_CLASS_HEADER and
  51         // REGISTER_CLASS_SOURCE macros
  52         virtual unsigned int getMetaClassId() = 0;
  53         virtual const char *getClassName() = 0;
  54 protected:
  55         static unsigned int nextMetaClassId_;
  56 };
  57
  58 class MetaClassFactory
  59 {
  60 public:
  61         MetaClassFactory();
  62         virtual ~MetaClassFactory();
  63
  64         // Automatically given by the
  65         // REGISTER_CLASS_HEADER and
  66         // REGISTER_CLASS_SOURCE macros
  67         virtual MetaClass *getClassCopy() = 0;
  68 };
  69
  70 class MetaClassRegistration
  71 {
  72 public:
  73         static void addMap(const char *name, MetaClassFactory *mclass);
  74         static std::map<std::string, MetaClassFactory *> *classMap;
  75         static MetaClass *getNewClass(const char *name);
  76         static MetaClassFactory *getFactory(const char *name);
  77 };
  78
  79 #endif // __INCLUDE_MetaClassh_INCLUDE__