private com.google.protobuf.SingleFieldBuilder<
          com.google.protobuf.DescriptorProtos.FileOptions, com.google.protobuf.DescriptorProtos.FileOptions.Builder, com.google.protobuf.DescriptorProtos.FileOptionsOrBuilder> 
          getOptionsFieldBuilder() {
        if (optionsBuilder_ == null) {
          optionsBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              com.google.protobuf.DescriptorProtos.FileOptions, com.google.protobuf.DescriptorProtos.FileOptions.Builder, com.google.protobuf.DescriptorProtos.FileOptionsOrBuilder>(
                  options_,
                  getParentForChildren(),
                  isClean());
          options_ = null;
        }
        return optionsBuilder_;
      }