naming_context.h

00001 /*************************************************************************
00002  *              ESLA: Embeddable Scripting LAnguage
00003  *                  Copyright (C) 2003 Frantz Maerten
00004  *
00005  *   This  program  is  free  software;  you  can  redistribute it and/or
00006  *   modify  it  under  the  terms  of  the GNU General Public License as
00007  *   published  by  the Free Software Foundation; either version 2 of the
00008  *   License, or (at your option) any later version.
00009  *
00010  *   If  you modify this software, you should contact the author, include
00011  *   a  notice giving the name of the person performing the modification,
00012  *   the date of modification, and the reason for such modification.
00013  *
00014  *   Note   that   the   GNU  General  Public  License  does  not  permit
00015  *   incorporating the Software into proprietary programs.
00016  *
00017  *  Contact: Frantz Maerten
00018  *     frantz@pangea.stanford.edu
00019  *
00020  *     Dept. of Geological & Environmental Sciences
00021  *     Stanford University 
00022  *     Stanford, CA 94305-2115
00023  *     USA
00024  *
00025  * Adapted from Bruno Levy (levy@loria.fr)
00026  *************************************************************************/
00027 
00028 
00029 #ifndef _NAMING_NAMING_CONTEXT__
00030 #define _NAMING_NAMING_CONTEXT__
00031 
00032 #include "../esla_namespace.h"
00033 #include "gen_object.h"
00034 #include <string>
00035 #include <vector>
00036 #include "name.h"
00037 
00038 //------------------------------------------------------
00039 
00040 BEGIN_LIB_NAMESPACE
00041 
00042 class NamingContext : public GenObject {
00043   typedef const std::string& str_arg ;
00044 public:
00045   typedef std::string NameComponent ;
00046   typedef std::string ClassNameComponent ;
00047 
00048   struct Binding {
00049     NameComponent binding_name ;
00050     ClassNameComponent binding_class_name ;
00051     GenObject* binded ;
00052     enum {
00053       CONTEXT,
00054       OBJECT
00055     } binding_type ;
00056 
00057   };
00058 
00059   typedef std::vector<Binding> BindingList ;
00060 
00061   NamingContext();
00062   virtual ~NamingContext();
00063     
00064   virtual bool bind(const Name& name, GenObject* object);
00065   virtual GenObject* resolve(const Name& name) const;
00066   virtual NamingContext* resolve_context(const Name& name) const;
00067   virtual NamingContext* resolve_context(str_arg name) const;
00068   virtual NamingContext* bind_new_context(const Name& name);
00069   virtual NamingContext* new_context() const;
00070 
00072   virtual ClassNameComponent context(GenObject* object) const ;
00073 
00074   virtual bool is_binded(const Name& name) const ;
00075   virtual void list(BindingList& bindings) const ;
00076   void binded(std::vector<std::string>& list) const ;
00077 
00078   bool unbind(const Name& name) ;
00079 
00080 protected:
00081   BindingList bindings_;
00082   friend class NamingLibrary ;
00083 
00084   void eat_one_name_component( const Name& name_in, Name& name_out) const;
00085   Binding& new_binding();
00086   NamingContext* find_context_from_component( 
00087     const NameComponent& name ) const;
00088   Binding* find_binding_from_component( const NameComponent& name ) const;
00089   Binding* find_binding_from_name(const Name& name) const;
00090 
00091 } ;
00092 
00093 
00094 END_LIB_NAMESPACE
00095 
00096 #endif
00097 
00098