OptionIterator.java 文件源码

public OptionIterator(FragmentContext context, Mode mode){
  final DrillConfigIterator configOptions = new DrillConfigIterator(context.getConfig());
  fragmentOptions = context.getOptions();
  final Iterator<OptionValue> optionList;
  switch(mode){
  case BOOT:
    optionList = configOptions.iterator();
    break;
  case SYS_SESS:
    optionList = fragmentOptions.iterator();
    break;
  default:
    optionList = Iterators.concat(configOptions.iterator(), fragmentOptions.iterator());
  }

  List<OptionValue> values = Lists.newArrayList(optionList);
  Collections.sort(values);
  mergedOptions = values.iterator();

}