private static int aggregateStamp ( int stamp_a , int stamp_b ) { if ( stamp_a == UNSET || stamp_b == UNSET ) { return UNSET ; } return ( stamp_a > stamp_b ) ? stamp_a : stamp_b ; }
Returns the pseudo - time - stamp for two fields given their individual pseudo - time - stamps . If either of the fields is unset then the aggregate is unset . Otherwise the aggregate is the later of the two stamps .