def __print_usage
puts "Options: --version | -v => print version information"
puts " --help | -h => print this message"
puts " -c|-t [-r] <class_name> <flow_str>"
puts " => -c for controller and -t for test generation"
puts " => -r to optionally generate the reverse or opposite"
puts " flow from flow_str."
puts " i.e if flow indicates UAS then generate a UAC etc."
puts " => <class_name> is the name of class to be generated, "
puts " controller or test."
puts " => <flow_str> is the actual call flow."
puts " e.g. '< INVITE, > 100, > 200 {2,7}, < ACK'"
exit(0)
end