File_Connection_Builder.h

Go to the documentation of this file.

#ifndef joedb_File_Connection_Builder_declared
#define joedb_File_Connection_Builder_declared
 
#include "joedb/ui/Connection_Builder.h"
#include "joedb/ui/File_Parser.h"
#include "joedb/concurrency/File_Connection.h"
 
#include <iostream>
 
namespace joedb
{
 /// @ingroup ui
 class File_Connection_Builder: public Connection_Builder
 {
  private:
   File_Parser file_parser;
   std::optional<Readonly_Journal> readonly_journal;
   std::optional<Writable_Journal> writable_journal;
   std::unique_ptr<Connection> connection;
 
  public:
   const char *get_name() const final {return "file";}
   int get_min_parameters() const final {return 1;}
   int get_max_parameters() const final {return 100;}
 
   const char *get_parameters_description() const final
   {
    return "<file>";
   }
 
   Connection &build
   (
    const int argc,
    const char * const * const argv,
    Buffered_File *file
   ) final
   {
    int arg_index = 0;
    std::ostream null_stream(nullptr);
    file_parser.parse(null_stream, argc, argv, arg_index);
 
    if (file_parser.get_file()->is_readonly())
    {
     readonly_journal.emplace(*file_parser.get_file());
     connection.reset(new Pullonly_Journal_Connection(*readonly_journal));
    }
    else
    {
     writable_journal.emplace(*file_parser.get_file());
     connection.reset(new Journal_Connection(*writable_journal));
    }
 
    return *connection;
   }
 };
}
 
#endif