private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.PacketType.TypeDescriptor,
            com.google.cloud.visionai.v1.PacketType.TypeDescriptor.Builder,
            com.google.cloud.visionai.v1.PacketType.TypeDescriptorOrBuilder>
        getTypeDescriptorFieldBuilder() {
      if (typeDescriptorBuilder_ == null) {
        typeDescriptorBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.PacketType.TypeDescriptor,
                com.google.cloud.visionai.v1.PacketType.TypeDescriptor.Builder,
                com.google.cloud.visionai.v1.PacketType.TypeDescriptorOrBuilder>(
                getTypeDescriptor(), getParentForChildren(), isClean());
        typeDescriptor_ = null;
      }
      return typeDescriptorBuilder_;
    }
<pre>
The type descriptor.
</pre>

<code>.google.cloud.visionai.v1.PacketType.TypeDescriptor type_descriptor = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/PacketType.java