question: private String attemptToChooseFormattingPattern ( ) { if ( nationalNumber . length ( ) >= MIN_LEADING_DIGITS_LENGTH ) { getAvailableFormats ( nationalNumber . toString ( ) ) ; String formattedNumber = attemptToFormatAccruedDigits ( ) ; if ( formattedNumber . length ( ) > 0 ) { return formattedNumber ; } return maybeCreateNewTemplate ( ) ? inputAccruedNationalNumber ( ) : accruedInput . toString ( ) ; } else { return appendNationalNumber ( nationalNumber . toString ( ) ) ; } }
target:  Attempts to set the formatting template and returns a string which contains the formatted version of the digits entered so far.