#ifndef _OWLPS_POSITIONING_INPUTMEDIUM_HH_
#define _OWLPS_POSITIONING_INPUTMEDIUM_HH_

#include "request.hh"

/// Super class of all input media
/**
 * Provide interface for input media, i.e. to read Request sent by a
 * Mobile.
 */
class InputMedium
{
protected:
  /// The Request just read
  Request current_request ;
  /// Number of the current line proceeded
  unsigned long current_line_nb ;

public:
  /// Default constructor
  InputMedium(void) ;

  virtual ~InputMedium(void) {} ///< Destructor (do nothing)

  /** @name Read accessors */
  //@{

  /// #current_request read accessor
  const Request& get_current_request(void) const ;

  /// #current_line_nb read accessor
  unsigned int get_current_line_nb(void) const ;

  /// Checks if the last request has been reached
  /**
   * @return \em true if the last request has been reached.
   * @return \em false if there is something more to read.
   */
  virtual bool eof(void) const = 0 ;

  //@} // End Read accessors

  /** @name Operations */
  //@{

  /// Reads the next request
  /**
   * Reads a Request, increments current_line_nb, updates #current_request
   * and returns it.
   * @return The Request read, or an empty Request in case of error or
   * EOF (note that when casted in bool, an empty Request is false, see
   * Request::operator bool()).
   */
  virtual const Request& get_next_request(void) = 0 ;

  //@} // End Operations
} ;



/* *** Constructors *** */


inline InputMedium::InputMedium()
{
  current_line_nb = 0 ;
}



/* *** Read accessors *** */


inline const Request& InputMedium::get_current_request() const
{
  return current_request ;
}


inline unsigned int InputMedium::get_current_line_nb() const
{
  return current_line_nb ;
}



#endif // _OWLPS_POSITIONING_INPUTMEDIUM_HH_