public BType addBuilder ( final MType message ) { ensureMutableMessageList ( ) ; ensureBuilders ( ) ; final SingleFieldBuilder < MType , BType , IType > builder = newSingleFieldBuilder ( message , this , isClean ) ; messages . add ( null ) ; builders . add ( builder ) ; onChanged ( ) ; incrementModCounts ( ) ; return builder . getBuilder ( ) ; }
Appends a new builder to the end of this list and returns the builder .