/**
     * It's a revelation
     */
    public final class Route
    {
        public static final class RouteBuilder
        {
            private final Destination from;
            private final Destination to;
            private Calendar date = Calendar.getInstance();
            
            public RouteBuilder(Destination from, Destination to)
            {
                this.from = from;
                this.to = to;
            }
            
            public RouteBuilder onDate(Calendar date)
            {
                this.date = date;
                
            return this;
            }

            public Route build() {
            return new Route(this.from, this.to, this.date);
            }
        }

        private final DateFormat dateFormat = new SimpleDateFormat("ddMMyyyy");
        
        private final Destination from;
        private final Destination to;
        private final Calendar date;

        private Route(Destination from, Destination to, Calendar date)
        {
            
            this.from = from;
            this.to = to;
            this.date = date;
        }

        private void appendDate(StringBuilder builder, Date date, DateFormat dateFormat) {
            builder.append( dateFormat.format(date) );
        }

        private void appendCode(StringBuilder builder, String code) {
            builder.append(code);
        }

        public int via(TransportMethod method) {
        return method.route(this.from, this.to, this.date);
        }
        
        public String bookingCode()
        {
            StringBuilder builder = new StringBuilder();
            
            this.appendCode(builder, this.from.code());    
            this.appendCode(builder, this.to.code());    
            this.appendDate(builder, this.date.getTime(), this.dateFormat);
            
        return builder.toString();
        }
    }

    /**
     * And a well thought design
     */
    public class RouteTest
    {
        private static final DateFormat dateFormat = new SimpleDateFormat("ddMMyyyy");  
        private static final Calendar now = Calendar.getInstance(); 
        private static final String BOOKING_CODE = 
            String.format("%s%s%s", 
                    Destination.EDINBURGH.code(), 
                    Destination.LONDON.code(),
                    dateFormat.format(now.getTime()));
        
        @Test
        public void via() throws Exception
        {
            TransportMethod transportMethod = TransportMethods.BUSINESS_FLYING;                
            Destination from = Destination.EDINBURGH;
            Destination to = Destination.LONDON;

            Route route = new RouteBuilder(from, to).build();

            Assert.assertEquals(BOOKING_CODE, route.bookingCode());
            Assert.assertEquals(500, route.via(transportMethod));
        }
    }