public Builder setTransferSpec(
          com.google.storagetransfer.v1.proto.TransferTypes.TransferSpec.Builder builderForValue) {
        if (transferSpecBuilder_ == null) {
          transferSpec_ = builderForValue.build();
        } else {
          transferSpecBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000004;
        onChanged();
        return this;
      }
<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