@java.lang.Override
      public com.google.storagetransfer.v1.proto.TransferTypes.AwsS3CompatibleData
          getAwsS3CompatibleDataSource() {
        if (awsS3CompatibleDataSourceBuilder_ == null) {
          if (dataSourceCase_ == 19) {
            return (com.google.storagetransfer.v1.proto.TransferTypes.AwsS3CompatibleData)
                dataSource_;
          }
          return com.google.storagetransfer.v1.proto.TransferTypes.AwsS3CompatibleData
              .getDefaultInstance();
        } else {
          if (dataSourceCase_ == 19) {
            return awsS3CompatibleDataSourceBuilder_.getMessage();
          }
          return com.google.storagetransfer.v1.proto.TransferTypes.AwsS3CompatibleData
              .getDefaultInstance();
        }
      }
<pre>
An AWS S3 compatible data source.
</pre>

<code>.google.storagetransfer.v1.AwsS3CompatibleData aws_s3_compatible_data_source = 19;
</code>

@return The awsS3CompatibleDataSource.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java