Чистый код. Создание, анализ и рефакторинг

  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)

  92         day = lastDayOfMonth;

  93     return day;

  94   }

  95

  96   public DayDate getPreviousDayOfWeek(Day targetDayOfWeek) {

  97     int offsetToTarget = targetDayOfWeek.toInt() - getDayOfWeek().toInt();

  98     if (offsetToTarget >= 0)

  99       offsetToTarget -= 7;

100     return plusDays(offsetToTarget);

101   }

102

103   public DayDate getFollowingDayOfWeek(Day targetDayOfWeek) {

104     int offsetToTarget = targetDayOfWeek.toInt() - getDayOfWeek().toInt();

105     if (offsetToTarget <= 0)

106       offsetToTarget += 7;

107     return plusDays(offsetToTarget);

108   }

109

110   public DayDate getNearestDayOfWeek(Day targetDayOfWeek) {

111     int offsetToThisWeeksTarget = targetDayOfWeek.toInt() - getDayOfWeek().

         toInt();

112     int offsetToFutureTarget = (offsetToThisWeeksTarget + 7) % 7;

113     int offsetToPreviousTarget = offsetToFutureTarget - 7;

114

Листинг Б.7 (продолжение)

115     if (offsetToFutureTarget > 3)

116       return plusDays(offsetToPreviousTarget);

117     else

118       return plusDays(offsetToFutureTarget);

119   }

120

121   public DayDate getEndOfMonth() {

122     Month month = getMonth();

123     int year = getYear();