public Builder addService(com.google.protobuf.DescriptorProtos.ServiceDescriptorProto value) {
        if (serviceBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          ensureServiceIsMutable();
          service_.add(value);
          onChanged();
        } else {
          serviceBuilder_.addMessage(value);
        }
        return this;
      }