@java.lang.Override
    public com.google.cloud.vision.v1.ImportProductSetsGcsSource getGcsSource() {
      if (gcsSourceBuilder_ == null) {
        if (sourceCase_ == 1) {
          return (com.google.cloud.vision.v1.ImportProductSetsGcsSource) source_;
        }
        return com.google.cloud.vision.v1.ImportProductSetsGcsSource.getDefaultInstance();
      } else {
        if (sourceCase_ == 1) {
          return gcsSourceBuilder_.getMessage();
        }
        return com.google.cloud.vision.v1.ImportProductSetsGcsSource.getDefaultInstance();
      }
    }
<pre>
The Google Cloud Storage location for a csv file which preserves a list
of ImportProductSetRequests in each line.
</pre>

<code>.google.cloud.vision.v1.ImportProductSetsGcsSource gcs_source = 1;</code>

@return The gcsSource.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ImportProductSetsInputConfig.java