Clean Code

Listing B-6 (continued)
RelativeDayOfWeekRule.java

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393
Appendix B: 
org.jfree.date.SerialDate
187 if (base != null) {
188 switch (this.relative) {
189 case(SerialDate.PRECEDING):
190 result = SerialDate.getPreviousDayOfWeek(this.dayOfWeek,
191 base);
192 break;
193 case(SerialDate.NEAREST):
194 result = SerialDate.getNearestDayOfWeek(this.dayOfWeek,
195 base);
196 break;
197 case(SerialDate.FOLLOWING):
198 result = SerialDate.getFollowingDayOfWeek(this.dayOfWeek,
199 base);
200 break;
201 default:
202 break;
203 }
204 }
205 return result;
206 
207 }
208 
209 }
Listing B-6 (continued)
RelativeDayOfWeekRule.java

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394
Appendix B: 
org.jfree.date.SerialDate
Listing B-7 
DayDate.java (Final)
1 /* ========================================================================
2 * JCommon : a free general purpose class library for the Java(tm) platform
3 * ========================================================================
4 *
5 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
...
36 */
37 package org.jfree.date;
38 
39 import java.io.Serializable;
40 import java.util.*;
41 
42 /**
43 * An abstract class that represents immutable dates with a precision of
44 * one day. The implementation will map each date to an integer that
45 * represents an ordinal number of days from some fixed origin.
46 *
47 * Why not just use java.util.Date? We will, when it makes sense. At times,
48 * java.util.Date can be *too* precise - it represents an instant in time,
49 * accurate to 1/1000th of a second (with the date itself depending on the
50 * time-zone). Sometimes we just want to represent a particular day (e.g. 21
51 * January 2015) without concerning ourselves about the time of day, or the
52 * time-zone, or anything else. That's what we've defined DayDate for.
53 *
54 * Use DayDateFactory.makeDate to create an instance.
55 *
56 * @author David Gilbert
57 * @author Robert C. Martin did a lot of refactoring.
58 */
59 
60 public abstract class DayDate implements Comparable, Serializable {
61 public abstract int getOrdinalDay();
62 public abstract int getYear();
63 public abstract Month getMonth();
64 public abstract int getDayOfMonth();
65 
66 protected abstract Day getDayOfWeekForOrdinalZero();
67 
68 public DayDate plusDays(int days) {
69 return DayDateFactory.makeDate(getOrdinalDay() + days);
70 }
71 
72 public DayDate plusMonths(int months) {
73 int thisMonthAsOrdinal = getMonth().toInt() - Month.JANUARY.toInt();
74 int thisMonthAndYearAsOrdinal = 12 * getYear() + thisMonthAsOrdinal;
75 int resultMonthAndYearAsOrdinal = thisMonthAndYearAsOrdinal + months;
76 int resultYear = resultMonthAndYearAsOrdinal / 12;
77 int resultMonthAsOrdinal = resultMonthAndYearAsOrdinal % 12 + Month.JANUARY.toInt();
78 Month resultMonth = Month.fromInt(resultMonthAsOrdinal);
79 int resultDay = correctLastDayOfMonth(getDayOfMonth(), resultMonth, resultYear);
80 return DayDateFactory.makeDate(resultDay, resultMonth, resultYear);
81 }
82 
83 public DayDate plusYears(int years) {
84 int resultYear = getYear() + years;
85 int resultDay = correctLastDayOfMonth(getDayOfMonth(), getMonth(), resultYear);
86 return DayDateFactory.makeDate(resultDay, getMonth(), resultYear);
87 }
88 
89 private int correctLastDayOfMonth(int day, Month month, int year) {
90 int lastDayOfMonth = DateUtil.lastDayOfMonth(month, year);
91 if (day > lastDayOfMonth)

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395