code: public void addTupleSink(final LeftTupleSink tupleSink, final BuildContext context) {
          this.sink = addTupleSink(this.sink, tupleSink, context);
      }
docs: Adds the <code>TupleSink</code> so that it may receive
  <code>Tuples</code> propagated from this <code>TupleSource</code>.
  
  @param tupleSink
  The <code>TupleSink</code> to receive propagated
  <code>Tuples</code>.