#include "input.hh"
#include "inputcsv.hh"
#include "request.hh"
#include "configuration.hh"
#include "posexcept.hh"

using namespace std ;


/* *** Constructors *** */


Input::Input()
{
  medium = NULL ;
  initialise_input_medium() ;
}


Input::~Input()
{
  delete medium ;
}



/* *** Operations *** */


void Input::initialise_input_medium()
{
  if (! Configuration::is_configured("input.medium"))
    throw no_input_medium() ;

  const string &medium_name =
    Configuration::get_string_value("input.medium") ;

  if (medium_name == "CSV")
    {
      if (! Configuration::is_configured("input.csv-file"))
        throw no_input_csv_file() ;
      medium = new
      InputCSV(Configuration::get_string_value("input.csv-file")) ;
    }

  else
    throw input_medium_type_unknown(medium_name) ;
}


const Request& Input::get_next_request() const
{
  if (medium == NULL)
    throw null_input_medium() ;
  return medium->get_next_request() ;
}


bool Input::eof() const
{
  if (medium == NULL)
    throw null_input_medium() ;
  return medium->eof() ;
}