public Builder setGcsSource(
          com.google.cloud.translate.v3.GcsInputSource.Builder builderForValue) {
        if (gcsSourceBuilder_ == null) {
          source_ = builderForValue.build();
          onChanged();
        } else {
          gcsSourceBuilder_.setMessage(builderForValue.build());
        }
        sourceCase_ = 3;
        return this;
      }
<pre>
Google Cloud Storage file source.
</pre>

<code>.google.cloud.translation.v3.GcsInputSource gcs_source = 3;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/DatasetInputConfig.java