if (f == null) { throw new IllegalArgumentException(E.FIELD_NULL); }
Validator.argNotNull(f, E.FIELD_NULL);
  protected static void isTypeValid(Field f)    throws  IllegalArgumentException,            SchemaException  {    if (f == null) {      throw new IllegalArgumentException(E.FIELD_NULL);    }    if (      !      (            f.getType().equals( FieldType.ACCESS    )        ||  f.getType().equals( FieldType.ATTRIBUTE )        ||  f.getType().equals( FieldType.LIST      )      )    )    {      throw new SchemaException(E.FIELD_TYPE + f.getType());    }  } // protected static void isTypeValid(f)