@java.lang.Override
  public boolean hasGcsInputSource() {
    return sourceCase_ == 3;
  }
<pre>
Google Cloud Storage file source.
</pre>

<code>.google.cloud.translation.v3.GcsInputSource gcs_input_source = 3;</code>

@return Whether the gcsInputSource field is set.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/ImportAdaptiveMtFileRequest.java