public com.google.storagetransfer.v1.proto.TransferTypes.TransferSpecOrBuilder
          getTransferSpecOrBuilder() {
        if (transferSpecBuilder_ != null) {
          return transferSpecBuilder_.getMessageOrBuilder();
        } else {
          return transferSpec_ == null
              ? com.google.storagetransfer.v1.proto.TransferTypes.TransferSpec.getDefaultInstance()
              : transferSpec_;
        }
      }
<pre>
Transfer specification.
</pre>

<code>.google.storagetransfer.v1.TransferSpec transfer_spec = 3;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java