#ifndef _evt_Header_h_
#define _evt_Header_h_

#include <utl/TimeStamp.h>

#include <string>

namespace evt {

  /**
     \class Header Header.h evt/Header.h
     \brief Global event header

      Holder for event time and event identifier.  The event identifier is concocted as follows:
       - if IoSd, use IoSdEvent::Id with "sd_" prepended
       - if FD, combine eye Id <tt>i</tt>, run number <tt>j</tt>, event number <tt>k</tt> for each eye in the event, in form: eye<tt>i</tt>_run<tt>j</tt>_event<tt>k</tt>
       - if IoAuger, use AugerEvent::Id() with "auger_" prepended
       - if Monte Carlo, compose an event identifier using a library identifier, a run number, a simulated shower number, and a counter specifying the number of times the shower was used.  The precise arrangement of this information is controllable from the EventGeneratorOG::EventGenerator module.  See EventGeneratorOG::EventGenerator for details.
     
     \author Tom Paul
     \date 13 May 2004
     \version $Id$
     \ingroup evt
  */

  class Header {

  public:

    /// Get the event identifier
    const std::string& GetId() const { return fId; }

    const utl::TimeStamp& GetTime() const { return fTimeStamp; }

    /// Set the event identifier    
    void SetId(const std::string& id) { fId = id; }

    void SetTime(const utl::TimeStamp& t)
    { fTimeStamp = t; }
    
  private:
    utl::TimeStamp fTimeStamp;
    std::string fId;

  };
		
}		


#endif // _evt_Header_h_

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