/* ======================================================================== *\
!
! *
! * This file is part of MARS, the MAGIC Analysis and Reconstruction
! * Software. It is distributed to you in the hope that it can be a useful
! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
! * It is distributed WITHOUT ANY WARRANTY.
! *
! * Permission to use, copy, modify and distribute this software and its
! * documentation for any purpose is hereby granted without fee,
! * provided that the above copyright notice appear in all copies and
! * that both that copyright notice and this permission notice appear
! * in supporting documentation. It is provided "as is" without express
! * or implied warranty.
! *
!
!
!   Author(s): Thomas Bretz  07/2001 <mailto:tbretz@uni-sw.gwdg.de>
!
!   Copyright: MAGIC Software Development, 2000-2001
!
!
\* ======================================================================== */

/////////////////////////////////////////////////////////////////////////////
//                                                                         //
//   MFilter                                                               //
//                                                                         //
//   This is a base class which defines an interface to create your own    //
//   filters. To do it derive a class from MFilter.                        //
//                                                                         //
//   You can create two types of Filters:                                  //
//    - static Filters and                                                 //
//    - dynamic Filters                                                    //
//                                                                         //
//   Static Filters:                                                       //
//    A static filter is a filter which value doesn't change dynamically,  //
//    which mean only once while running through your tasklist. To create  //
//    a static filter override the Process-function of MFilter (this is    //
//    the function in which the filer-value should be updated). If         //
//    necessary you can also overwrite Pre-/PostProcess. The process       //
//    function should calculate the return value of IsExpressionTrue.      //
//    IsExpressionTrue should simply return this value. This kind of       //
//    filter must be added to the tasklist at a point which is forseen to  //
//    update the value of the filter (eg. after the reading task).         //
//                                                                         //
//   Dynamic Filters:                                                      //
//    A dynamic filter is a filter which returns a value which must be     //
//    calculated at the time the filter is called. To create such a        //
//    filter you have to overwrite IsExpressionTrue only. If there is      //
//    no need for a 'one-point' update this filter must not be added to    //
//    the tasklist.                                                        //
//                                                                         //
//   Usage:                                                                //
//    A Filter is connected to a task by calling MTask::SetFilter. The     //
//    task is now executed when IsExpressionTrue returns a value           //
//    (different from kFALSE) only.                                        //
//                                                                         //
//   Remarks:                                                              //
//    - Make sure, that all tasks which depends on this filter are either  //
//      collected in a MTaskList-object or are conected to the same        //
//      filter.                                                            //
//    - If you want to use different filters (combined logically) for one  //
//      task please look for the MFilterList class.                        //
//    - Be careful, the return value of IsExpressionTrue is NOT a real     //
//      boolean. You can return other values, too.                         //
//                                                                         //
/////////////////////////////////////////////////////////////////////////////

#include "MFilter.h"

ClassImp(MFilter);

MFilter::MFilter(const char *name, const char *title)
{
    fName  = name  ? name  : "MFilter";
    fTitle = title ? title : "Base Class for a filter";
}

// --------------------------------------------------------------------------
//
Bool_t MFilter::PreProcess(MParList *pList)
{
    return kTRUE;
}

// --------------------------------------------------------------------------
//
Bool_t MFilter::Process()
{
    return kTRUE;
}

// --------------------------------------------------------------------------
//
Bool_t MFilter::PostProcess()
{
    return kTRUE;
}
