Clean Code

Appendix B: 
org.jfree.date.SerialDate
Listing B-9 
Day.java (Final)
1 package org.jfree.date;
2 
3 import java.util.Calendar;
4 import java.text.DateFormatSymbols;
5 
6 public enum Day {
7 MONDAY(Calendar.MONDAY),
8 TUESDAY(Calendar.TUESDAY),
9 WEDNESDAY(Calendar.WEDNESDAY),
10 THURSDAY(Calendar.THURSDAY),
11 FRIDAY(Calendar.FRIDAY),
12 SATURDAY(Calendar.SATURDAY),
13 SUNDAY(Calendar.SUNDAY);
14 
15 private final int index;
16 private static DateFormatSymbols dateSymbols = new DateFormatSymbols();
17 
18 Day(int day) {
19 index = day;
20 }
21 
22 public static Day fromInt(int index) throws IllegalArgumentException {
23 for (Day d : Day.values())
24 if (d.index == index)
25 return d;
26 throw new IllegalArgumentException(
27 String.format("Illegal day index: %d.", index));
28 }
29 
30 public static Day parse(String s) throws IllegalArgumentException {
31 String[] shortWeekdayNames =
32 dateSymbols.getShortWeekdays();
33 String[] weekDayNames =
34 dateSymbols.getWeekdays();
35 
36 s = s.trim();
37 for (Day day : Day.values()) {
38 if (s.equalsIgnoreCase(shortWeekdayNames[day.index]) ||
39 s.equalsIgnoreCase(weekDayNames[day.index])) {
40 return day;
41 }
42 }
43 throw new IllegalArgumentException(
44 String.format("%s is not a valid weekday string", s));
45 }
46 
47 public String toString() {
48 return dateSymbols.getWeekdays()[index];
49 }
50 
51 public int toInt() {
52 return index;
53 }
54 }

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399
Appendix B: 
org.jfree.date.SerialDate
Listing B-10 
DateInterval.java (Final)
1 package org.jfree.date;
2 
3 public enum DateInterval {
4 OPEN {
5 public boolean isIn(int d, int left, int right) {
6 return d > left && d < right;
7 }
8 },
9 CLOSED_LEFT {
10 public boolean isIn(int d, int left, int right) {
11 return d >= left && d < right;
12 }
13 },
14 CLOSED_RIGHT {
15 public boolean isIn(int d, int left, int right) {
16 return d > left && d <= right;
17 }
18 },
19 CLOSED {
20 public boolean isIn(int d, int left, int right) {
21 return d >= left && d <= right;
22 }
23 };
24 
25 public abstract boolean isIn(int d, int left, int right);
26 }

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400