public java.util.List<? extends com.google.protobuf.DescriptorProtos.FieldDescriptorProtoOrBuilder> 
           getExtensionOrBuilderList() {
        if (extensionBuilder_ != null) {
          return extensionBuilder_.getMessageOrBuilderList();
        } else {
          return java.util.Collections.unmodifiableList(extension_);
        }
      }