//____________________________________________________________________
// 
// BrEventList
// An event FIFO. This class is to be used if you want to cache a 
// certain number of events. Once cached you can go back and forth
// in the list.

//____________________________________________________________________
//
// $Id: BrEventList.cxx,v 1.2 2001/08/17 16:27:43 jens Exp $
// $Author: jens $
// $Date: 2001/08/17 16:27:43 $
// $Copyright: (C) 2001 BRAHMS Collaboration <brahmlib@rhic.bnl.gov>
//
#ifndef BRAT_BrEventList
#include "BrEventList.h"
#endif

//____________________________________________________________________
ClassImp(BrEventList);

//____________________________________________________________________
 BrEventList::BrEventList()
{
  // Default constructor

  fMax   = 100;
  fIndex = 0;
}

//____________________________________________________________________
 BrEventList::BrEventList( Int_t max )
{
  // Constructor.

  fMax   = max;
  fIndex = 0;
}

//____________________________________________________________________
 void BrEventList::Add( TObject* obj )
{
  // Add event 'obj' to list. Remove first event if by adding this event
  // one exceeds fMax.

  if ( !fMax || !obj )
    return;
  
  Int_t size = GetSize();

  while ( size >= fMax ) {

    BrEvent* ev = (BrEvent*) First();
    Remove( ev );
    delete ev;
    size--;
  }

  AddLast( obj );
  fIndex = GetSize() - 1;
}

//____________________________________________________________________
 BrEvent* BrEventList::GetNextEvent()
{
  // Get next event. Return 0 if no event
  // was found when reaching the end of the list.

  if ( IsAtLast() || !At( fIndex ) ) return NULL;

  return (BrEvent*) At( ++fIndex );
}

//____________________________________________________________________
 BrEvent* BrEventList::GetPreviousEvent()
{
  // Get previous event that matches trigger mask 'mask'. Return 0 if no event
  // was found when reaching the beginning of the list.

  if ( IsAtFirst() || !At( fIndex ) ) return NULL;

  return (BrEvent*) At( --fIndex );
}

//____________________________________________________________________
//
// $Log: BrEventList.cxx,v $
// Revision 1.2  2001/08/17 16:27:43  jens
// Removed all interface to BrTriggerManager
//
// Revision 1.1  2001/08/16 15:37:17  jens
//
// New class BrEventList
//
//
//

Copyright ; 2002 BRAHMS Collaboration <brahmlib@rcf.rhic.bnl.gov>
Last Update on by

Validate HTML
Validate CSS