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