public Builder setAwsS3CompatibleDataSource(
          com.google.storagetransfer.v1.proto.TransferTypes.AwsS3CompatibleData.Builder
              builderForValue) {
        if (awsS3CompatibleDataSourceBuilder_ == null) {
          dataSource_ = builderForValue.build();
          onChanged();
        } else {
          awsS3CompatibleDataSourceBuilder_.setMessage(builderForValue.build());
        }
        dataSourceCase_ = 19;
        return this;
      }
<pre>
An AWS S3 compatible data source.
</pre>

<code>.google.storagetransfer.v1.AwsS3CompatibleData aws_s3_compatible_data_source = 19;
</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java