JTriggeredFileScanner.hh

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#ifndef __JTRIGGEREDFILESCANNER__
#define __JTRIGGEREDFILESCANNER__

#include "JLang/JTypeList.hh"
#include "JLang/JNullType.hh"
#include "JLang/JMultiPointer.hh"

#include "evt/Evt.hh"
#include "JDAQ/JDAQEvent.hh"
#include "JSupport/JMultipleFileScanner.hh"
#include "JSupport/JParallelFileScanner.hh"
#include "JSupport/JTreeScanner.hh"
#include "JSupport/JSupport.hh"


/**
 * \file
 *
 * Synchronously read DAQ events and Monte Carlo events (and optionally other events).
 * \author mdejong
 */
namespace JSUPPORT {}
namespace JPP { using namespace JSUPPORT; }

namespace JSUPPORT {

  using JLANG::JTypeList;
  using JLANG::JNullType;
  using JLANG::JMultiPointer;
  using KM3NETDAQ::JDAQEvent;


  /**
   * Auxiliary class to synchronously read DAQ events and Monte Carlo events (and optionally other events).
   * It is assumed that the TTree corresponding to the template argument and
   * the TTree with KM3NETDAQ::JDAQEvent can be read in parallel.
   */
  template<class JTypelist_t = JNullType>
  struct JTriggeredFileScanner :
    public JParallelFileScanner<JTypeList<JDAQEvent, JTypelist_t>, JMultipleFileScanner>
  {
    typedef JTypeList<JDAQEvent, JTypelist_t>                                            typelist;
    typedef JParallelFileScanner<typelist, JMultipleFileScanner>                         base_class;
    typedef JMultiPointer< JTypeList<Evt, typelist> >                                    multi_pointer_type;


    /**
     * Default constructor.
     */
    JTriggeredFileScanner() :
      base_class()
    {}

    
    /**
     * Constructor.
     *
     * \param  input             input
     * \param  limit             limit
     */
    JTriggeredFileScanner(const typename base_class::input_type& input, const JLimit& limit = JLimit()) 
    {
      this->configure(input, limit);
    }
    

    /**
     * Check availability of next element.
     *
     * \return                  true if the iteration has more elements; else false
     */
    virtual bool hasNext() 
    {
      bool has_next = base_class::hasNext();
      
      if (has_next && file_name != this->getFilename()) {

        in.configure(this->getFilename());

        file_name =  this->getFilename();
      }
      
      return has_next;
    }
    

    /**
     * Get next element.
     *
     * \return            multi-pointer to elements
     */
    virtual const multi_pointer_type& next()
    {
      static multi_pointer_type ps;
      
      typename base_class::multi_pointer_type __p = base_class::next();
      
      JDAQEvent* tev   = __p;
      Evt*       event = in.getEntry(tev->getCounter());

      ps.reset(event, __p);

      return ps;
    }

  protected:
    JTreeScanner<Evt> in;
    std::string file_name;
  };
}


#endif