Clean Code

Appendix B: 
org.jfree.date.SerialDate
Listing B-11 
WeekInMonth.java (Final)
1 package org.jfree.date;
2 
3 public enum WeekInMonth {
4 FIRST(1), SECOND(2), THIRD(3), FOURTH(4), LAST(0);
5 private final int index;
6 
7 WeekInMonth(int index) {
8 this.index = index;
9 }
10 
11 public int toInt() {
12 return index;
13 }
14 }

---

401
Appendix B: 
org.jfree.date.SerialDate
Listing B-12 
WeekdayRange.java (Final)
1 package org.jfree.date;
2 
3 public enum WeekdayRange {
4 LAST, NEAREST, NEXT
5 }

---

402
Appendix B: 
org.jfree.date.SerialDate
Listing B-13 
DateUtil.java (Final)
1 package org.jfree.date;
2 
3 import java.text.DateFormatSymbols;
4 
5 public class DateUtil {
6 private static DateFormatSymbols dateFormatSymbols = new DateFormatSymbols();
7 
8 public static String[] getMonthNames() {
9 return dateFormatSymbols.getMonths();
10 }
11 
12 public static boolean isLeapYear(int year) {
13 boolean fourth = year % 4 == 0;
14 boolean hundredth = year % 100 == 0;
15 boolean fourHundredth = year % 400 == 0;
16 return fourth && (!hundredth || fourHundredth);
17 }
18 
19 public static int lastDayOfMonth(Month month, int year) {
20 if (month == Month.FEBRUARY && isLeapYear(year))
21 return month.lastDay() + 1;
22 else
23 return month.lastDay();
24 }
25 
26 public static int leapYearCount(int year) {
27 int leap4 = (year - 1896) / 4;
28 int leap100 = (year - 1800) / 100;
29 int leap400 = (year - 1600) / 400;
30 return leap4 - leap100 + leap400;
31 }
32 }

---

403