public String getDescription() {
      java.lang.Object ref = description_;
      if (ref instanceof String) {
        return (String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        String s = bs.toStringUtf8();
        if (com.google.protobuf.Internal.isValidUtf8(bs)) {
          description_ = s;
        }
        return s;
      }
    }