public Builder mergeCrossingLine(com.google.cloud.visionai.v1.NormalizedPolyline value) {
      if (crossingLineBuilder_ == null) {
        if (annotationPayloadCase_ == 6
            && annotationPayload_
                != com.google.cloud.visionai.v1.NormalizedPolyline.getDefaultInstance()) {
          annotationPayload_ =
              com.google.cloud.visionai.v1.NormalizedPolyline.newBuilder(
                      (com.google.cloud.visionai.v1.NormalizedPolyline) annotationPayload_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          annotationPayload_ = value;
        }
        onChanged();
      } else {
        if (annotationPayloadCase_ == 6) {
          crossingLineBuilder_.mergeFrom(value);
        } else {
          crossingLineBuilder_.setMessage(value);
        }
      }
      annotationPayloadCase_ = 6;
      return this;
    }
<pre>
Annotation for type CROSSING_LINE
</pre>

<code>.google.cloud.visionai.v1.NormalizedPolyline crossing_line = 6;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/StreamAnnotation.java