extractEvt.cpp

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#include "merge/extractEvt.C"
#include <cstdlib>
#include <stdexcept>

static int usage()
{
  ::printf( "Gaudi event extraction facility for ROOT tree based files.\n"
            " Usage: \n"
            "extract_event -o <output-file> -i <input-file> ...]\n\n"
            "input- and output files may specify any legal (ROOT) file name.\n"
            "   -output      Specify output file name.\n"
            "   -input       Specify input file name.\n"
            "   -event       Specify the event entry number.\n" );
  return 1;
}

int main( int argc, char** argv )
{
  string input;
  string output;
  int    evt_num = -1;
  for ( int i = 1; i < argc; ++i ) {
    if ( *argv[i] == '-' ) {
      switch (::toupper( *( argv[i] + 1 ) ) ) {
      case 'E':
        if ( 1 != ::sscanf( argv[i + 1], "%d", &evt_num ) ) {
          ::printf( "\nERROR: No valid event identifier given.\n\n" );
          return usage();
        }
        ++i;
        break;
      case 'O':
        if ( i + 1 < argc ) output = argv[i + 1];
        ++i;
        break;
      case 'I':
        if ( i + 1 < argc ) input = argv[i + 1];
        ++i;
        break;
      default:
        return usage();
      }
    }
  }
  if ( input.empty() ) {
    ::printf( "\nERROR: No input file(s) supplied\n\n" );
    return usage();
  } else if ( output.empty() ) {
    ::printf( "\nERROR: No output file supplied.\n\n" );
    return usage();
  } else if ( evt_num < 0 ) {
    ::printf( "\nERROR: No valid event identifier given.\n\n" );
    return usage();
  }
  gROOT->SetBatch( kTRUE );
  try {
    if ( extract_event( input.c_str(), output.c_str(), evt_num ) != EXTRACT_SUCCESS ) {
      ::printf( "\nERROR: Event extraction from file %s failed.\n", input.c_str() );
      return 1;
    }
    return 0;
  } catch ( const std::exception& e ) {
    ::printf( "\nERROR: Event extraction from file %s failed [%s]\n", input.c_str(), e.what() );
  } catch ( ... ) {
    ::printf( "\nERROR: Event extraction from file %s failed [unknown reason]\n", input.c_str() );
  }
  return 1;
}