public Builder mergeActiveZone(com.google.cloud.visionai.v1.NormalizedPolygon value) {
      if (activeZoneBuilder_ == null) {
        if (annotationPayloadCase_ == 5
            && annotationPayload_
                != com.google.cloud.visionai.v1.NormalizedPolygon.getDefaultInstance()) {
          annotationPayload_ =
              com.google.cloud.visionai.v1.NormalizedPolygon.newBuilder(
                      (com.google.cloud.visionai.v1.NormalizedPolygon) annotationPayload_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          annotationPayload_ = value;
        }
        onChanged();
      } else {
        if (annotationPayloadCase_ == 5) {
          activeZoneBuilder_.mergeFrom(value);
        } else {
          activeZoneBuilder_.setMessage(value);
        }
      }
      annotationPayloadCase_ = 5;
      return this;
    }
<pre>
Annotation for type ACTIVE_ZONE
</pre>

<code>.google.cloud.visionai.v1.NormalizedPolygon active_zone = 5;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/StreamAnnotation.java