code: def format_args_for_target(self, target, target_workdir):
      
  
      args = ['--java_out={0}'.format(target_workdir)]
  
      # Add all params in payload to args
  
      relative_sources, source_roots = self._compute_sources(target)
  
      if target.payload.get_field_value('no_options'):
        args.append('--no_options')
  
      if target.payload.service_writer:
        args.append('--service_writer={}'.format(target.payload.service_writer))
        if target.payload.service_writer_options:
          for opt in target.payload.service_writer_options:
            args.append('--service_writer_opt')
            args.append(opt)
  
      registry_class = target.payload.registry_class
      if registry_class:
        args.append('--registry_class={0}'.format(registry_class))
  
      if target.payload.roots:
        args.append('--roots={0}'.format(','.join(target.payload.roots)))
  
      if target.payload.enum_options:
        args.append('--enum_options={0}'.format(','.join(target.payload.enum_options)))
  
      for source_root in source_roots:
        args.append('--proto_path={0}'.format(os.path.join(get_buildroot(), source_root)))
  
      args.extend(relative_sources)
      return args
docs: Calculate the arguments to pass to the command line for a single target.