question: public static String decodeText ( String text ) throws UnsupportedEncodingException { if ( ! text . contains ( ENCODED_TOKEN_MARKER ) ) { return text ; } int offset = 0 ; int endOffset = text . length ( ) ; int startWhiteSpace = - 1 ; int endWhiteSpace = - 1 ; StringBuilder decodedText = new StringBuilder ( text . length ( ) ) ; boolean previousTokenEncoded = false ; while ( offset < endOffset ) { char ch = text . charAt ( offset ) ; if ( LINEAR_WHITESPACE . indexOf ( ch ) != - 1 ) { startWhiteSpace = offset ; while ( offset < endOffset ) { ch = text . charAt ( offset ) ; if ( LINEAR_WHITESPACE . indexOf ( ch ) != - 1 ) { offset ++ ; } else { endWhiteSpace = offset ; break ; } } } else { int wordStart = offset ; while ( offset < endOffset ) { ch = text . charAt ( offset ) ; if ( LINEAR_WHITESPACE . indexOf ( ch ) == - 1 ) { offset ++ ; } else { break ; } } String word = text . substring ( wordStart , offset ) ; if ( word . startsWith ( ENCODED_TOKEN_MARKER ) ) { try { String decodedWord = decodeWord ( word ) ; if ( ! previousTokenEncoded && startWhiteSpace != - 1 ) { decodedText . append ( text . substring ( startWhiteSpace , endWhiteSpace ) ) ; startWhiteSpace = - 1 ; } previousTokenEncoded = true ; decodedText . append ( decodedWord ) ; continue ; } catch ( ParseException e ) { } } if ( startWhiteSpace != - 1 ) { decodedText . append ( text . substring ( startWhiteSpace , endWhiteSpace ) ) ; startWhiteSpace = - 1 ; } previousTokenEncoded = false ; decodedText . append ( word ) ; } } return decodedText . toString ( ) ; }
target:  Decode a string of text obtained from a mail header into its proper form.  The text generally will consist of a string of tokens, some of which may be encoded using base64 encoding.