public Builder setCenter(
          org.bwapi.proxy.messages.BasicTypes.Position.Builder builderForValue) {
        if (centerBuilder_ == null) {
          center_ = builderForValue.build();
          onChanged();
        } else {
          centerBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000020;
        return this;
      }