question: public RepeatedFieldBuilder < MType , BType , IType > addAllMessages ( Iterable < ? extends MType > values ) { for ( final MType value : values ) { if ( value == null ) { throw new NullPointerException ( ) ; } } if ( values instanceof Collection ) { @ SuppressWarnings ( "unchecked" ) final Collection < MType > collection = ( Collection < MType > ) values ; if ( collection . size ( ) == 0 ) { return this ; } ensureMutableMessageList ( ) ; for ( MType value : values ) { addMessage ( value ) ; } } else { ensureMutableMessageList ( ) ; for ( MType value : values ) { addMessage ( value ) ; } } onChanged ( ) ; incrementModCounts ( ) ; return this ; }
target:  Appends all of the messages in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator.