private com.google.protobuf.SingleFieldBuilder<
          org.bwapi.proxy.messages.BasicTypes.Position, org.bwapi.proxy.messages.BasicTypes.Position.Builder, org.bwapi.proxy.messages.BasicTypes.PositionOrBuilder> 
          getTargetPositionFieldBuilder() {
        if (targetPositionBuilder_ == null) {
          targetPositionBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              org.bwapi.proxy.messages.BasicTypes.Position, org.bwapi.proxy.messages.BasicTypes.Position.Builder, org.bwapi.proxy.messages.BasicTypes.PositionOrBuilder>(
                  targetPosition_,
                  getParentForChildren(),
                  isClean());
          targetPosition_ = null;
        }
        return targetPositionBuilder_;
      }