@java.lang.Override
      public com.google.cloud.translate.v3.GcsInputSource getGcsSource() {
        if (gcsSourceBuilder_ == null) {
          if (sourceCase_ == 3) {
            return (com.google.cloud.translate.v3.GcsInputSource) source_;
          }
          return com.google.cloud.translate.v3.GcsInputSource.getDefaultInstance();
        } else {
          if (sourceCase_ == 3) {
            return gcsSourceBuilder_.getMessage();
          }
          return com.google.cloud.translate.v3.GcsInputSource.getDefaultInstance();
        }
      }
<pre>
Google Cloud Storage file source.
</pre>

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

@return The gcsSource.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/DatasetInputConfig.java