public Builder mergeAnnotation(com.google.cloud.visionai.v1.StreamAnnotation value) {
          if (annotationBuilder_ == null) {
            if (((bitField0_ & 0x00000001) != 0)
                && annotation_ != null
                && annotation_
                    != com.google.cloud.visionai.v1.StreamAnnotation.getDefaultInstance()) {
              getAnnotationBuilder().mergeFrom(value);
            } else {
              annotation_ = value;
            }
          } else {
            annotationBuilder_.mergeFrom(value);
          }
          if (annotation_ != null) {
            bitField0_ |= 0x00000001;
            onChanged();
          }
          return this;
        }
<pre>
Line annotation from the user.
</pre>

<code>.google.cloud.visionai.v1.StreamAnnotation annotation = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java