public Builder setGcsSource(
        com.google.cloud.vision.v1p4beta1.ImportProductSetsGcsSource value) {
      if (gcsSourceBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        source_ = value;
        onChanged();
      } else {
        gcsSourceBuilder_.setMessage(value);
      }
      sourceCase_ = 1;
      return this;
    }
<pre>
The Google Cloud Storage location for a csv file which preserves a list
of ImportProductSetRequests in each line.
</pre>

<code>.google.cloud.vision.v1p4beta1.ImportProductSetsGcsSource gcs_source = 1;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/ImportProductSetsInputConfig.java