public Builder setEnumType(
          int index, com.google.protobuf.DescriptorProtos.EnumDescriptorProto value) {
        if (enumTypeBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          ensureEnumTypeIsMutable();
          enumType_.set(index, value);
          onChanged();
        } else {
          enumTypeBuilder_.setMessage(index, value);
        }
        return this;
      }