public CommandLineFiles(String listFileFlag,String singleInputFlag,FileConstraint... constraints){
  this(listFileFlag,singleInputFlag);
  mConstraints.addAll(Arrays.asList(constraints));
}

public CommandLineFiles ( String listFileFlag , String singleInputFlag , FileConstraint ... constraints ) { this ( listFileFlag , singleInputFlag ) ; mConstraints . addAll ( Arrays . asList ( constraints ) ) ; }
construct a file list collector with the specified constraints .
