Clean Code

Listing B-16 (continued)
SpreadsheetDate.java (Final)

---

407
Appendix B: 
org.jfree.date.SerialDate
167 private void calcDayMonthYear() {
168 int days = ordinalDay - EARLIEST_DATE_ORDINAL;
169 int overestimatedYear = MINIMUM_YEAR_SUPPORTED + days / 365;
170 int nonleapdays = days - DateUtil.leapYearCount(overestimatedYear);
171 int underestimatedYear = MINIMUM_YEAR_SUPPORTED + nonleapdays / 365;
172 
173 year = huntForYearContaining(ordinalDay, underestimatedYear);
174 int firstOrdinalOfYear = firstOrdinalOfYear(year);
175 month = huntForMonthContaining(ordinalDay, firstOrdinalOfYear);
176 day = ordinalDay - firstOrdinalOfYear - daysBeforeThisMonth(month.toInt());
177 }
178 
179 private Month huntForMonthContaining(int anOrdinal, int firstOrdinalOfYear) {
180 int daysIntoThisYear = anOrdinal - firstOrdinalOfYear;
181 int aMonth = 1;
182 while (daysBeforeThisMonth(aMonth) < daysIntoThisYear)
183 aMonth++;
184 
185 return Month.fromInt(aMonth - 1);
186 }
187 
188 private int daysBeforeThisMonth(int aMonth) {
189 if (DateUtil.isLeapYear(year))
190 return LEAP_YEAR_AGGREGATE_DAYS_TO_END_OF_PRECEDING_MONTH[aMonth] - 1;
191 else
192 return AGGREGATE_DAYS_TO_END_OF_PRECEDING_MONTH[aMonth] - 1;
193 }
194 
195 private int huntForYearContaining(int anOrdinalDay, int startingYear) {
196 int aYear = startingYear;
197 while (firstOrdinalOfYear(aYear) <= anOrdinalDay)
198 aYear++;
199 
200 return aYear - 1;
201 }
202 
203 private int firstOrdinalOfYear(int year) {
204 return calcOrdinal(1, Month.JANUARY, year);
205 }
206 
207 public static DayDate createInstance(Date date) {
208 GregorianCalendar calendar = new GregorianCalendar();
209 calendar.setTime(date);
210 return new SpreadsheetDate(calendar.get(Calendar.DATE),
211 Month.fromInt(calendar.get(Calendar.MONTH) + 1),
212 calendar.get(Calendar.YEAR));
213 
214 }
215 }