question: private String makeEscaped ( String name ) { int length = name . length ( ) ; if ( length == 0 ) { return name ; } StringBuilder buf = new StringBuilder ( length * 2 ) ; for ( int index = 0 ; index < length ; index ++ ) { char ch = name . charAt ( index ) ; switch ( ch ) { case ' ' : if ( index == 0 || index == ( length - 1 ) ) { buf . append ( '\\' ) ; } buf . append ( ' ' ) ; break ; case '"' : case '\\' : hasQE = true ; buf . append ( '\\' ) ; buf . append ( ch ) ; break ; case ',' : case '+' : case '<' : case '>' : case ';' : case '#' : case '=' : buf . append ( '\\' ) ; buf . append ( ch ) ; break ; default : buf . append ( ch ) ; break ; } } return buf . toString ( ) ; }
target:  Escapes: 1) chars ",", "+", """, "\", "<", ">", ";" (RFC 2253) 2) chars "#", "=" (required by RFC 1779) 3) a space char at the beginning or end 4) according to the requirement to be RFC 1779 compatible: '#' char is escaped in any position