JEventSourceGenerator_EVIO.cc

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// $Id$
// $HeadURL$
//
//    File: JEventSourceGenerator_EVIO.cc
// Created: Tue May 21 14:05:48 EDT 2013
// Creator: davidl (on Darwin harriet.jlab.org 11.4.2 i386)
//

#include <string>
using std::string;
#include "JEventSourceGenerator_EVIO.h"
using namespace jana;

#include "HDEVIO.h"

//---------------------------------
// Description
//---------------------------------
const char* JEventSourceGenerator_EVIO::Description(void)
{
   return "EVIO  - Reads EVIO formatted data from file or ET system";
}

//---------------------------------
// CheckOpenable
//---------------------------------
double JEventSourceGenerator_EVIO::CheckOpenable(string source)
{
   // First, check if the source starts with "ET:". If so,
   // return 0.5 immediately. If it does not start with this,
   // test open the file and see if we can read a block
   // from it. If we can, then return 0.75 which will likely
   // win us the right to open it. If we can't, but the file
   // ends in ".evio" then return 0.01 which will win us
   // the right to open it if no other source claims it. This
   // will allow the program to print an appropriate error
   // message/

   if(source.find("ET:")==0) return 0.5;

   HDEVIO *hdevio = new HDEVIO(source, false);
   bool is_good_evio = false;
   bool opened = hdevio->is_open;
   if(opened){
      is_good_evio = hdevio->ReadBlock();
   }
   delete hdevio;
   
   if(is_good_evio) return 0.5;
   if(source.find(".evio") != source.npos) return 0.01;
   
   return 0.0;
}

//---------------------------------
// MakeJEventSource
//---------------------------------
JEventSource* JEventSourceGenerator_EVIO::MakeJEventSource(string source)
{
   return new JEventSource_EVIO(source.c_str());
}