@java.lang.Override
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
    }
<pre>
Root directory path to the filesystem.
</pre>

<code>string root_directory = 1;</code>

@return The bytes for rootDirectory.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java