question: private static byte findLongestExpansion ( String uriString , int pos ) { byte expansion = - 1 ; int expansionLength = 0 ; for ( int i = 0 ; i < URL_CODES . size ( ) ; i ++ ) { int key = URL_CODES . keyAt ( i ) ; String value = URL_CODES . valueAt ( i ) ; if ( value . length ( ) > expansionLength && uriString . startsWith ( value , pos ) ) { expansion = ( byte ) key ; expansionLength = value . length ( ) ; } } return expansion ; }
target:  Finds the longest expansion from the uri at the current position.