@java.lang.Override
    public boolean hasAwsS3DataSource() {
      return dataSourceCase_ == 2;
    }
<pre>
An AWS S3 data source.
</pre>

<code>.google.storagetransfer.v1.AwsS3Data aws_s3_data_source = 2;</code>

@return Whether the awsS3DataSource field is set.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java