src/main/java/com/github/sebhoss/time/AbstractFiscalDateCalculator.java

   1 /*
   2  * This program is free software. It comes without any warranty, to
   3  * the extent permitted by applicable law. You can redistribute it
   4  * and/or modify it under the terms of the Do What The Fuck You Want
   5  * To Public License, Version 2, as published by Sam Hocevar. See
   6  * http://www.wtfpl.net/ for more details.
   7  */
   8 package com.github.sebhoss.time;
   9
  10 import org.joda.time.Days;
  11 import org.joda.time.LocalDate;
  12 import org.joda.time.Weeks;
  13
  14 abstract class AbstractFiscalDateCalculator implements FiscalDateCalculator {
  15
  16     protected final int fiscalYearStartMonth;
  17
  18     AbstractFiscalDateCalculator(final int fiscalStartMonth) {
  19         fiscalYearStartMonth = fiscalStartMonth;
  20     }
  21
  22     @Override
  23     public final int calculateFiscalMonth(final LocalDate calendarDate) {
  24         final int calendarMonth = calendarDate.getMonthOfYear();
  25         final int maximumNumberOfMonths = calendarDate.monthOfYear().getMaximumValue();
  26
  27         if (fiscalYearStartMonth <= calendarMonth) {
  28             return calendarMonth - fiscalYearStartMonth + 1;
  29         }
  30
  31         return calendarMonth + maximumNumberOfMonths - fiscalYearStartMonth + 1;
  32     }
  33
  34     @Override
  35     public final int calculateFiscalWeekOfYear(final LocalDate calendarDate) {
  36         final LocalDate fiscalYearStartDate = createMatchingFiscalYearStartDate(calendarDate);
  37
  38         return Weeks.weeksBetween(fiscalYearStartDate, calendarDate).getWeeks() + 1;
  39     }
  40
  41     @Override
  42     public final int calculateFiscalDayOfYear(final LocalDate calendarDate) {
  43         final LocalDate fiscalYearStartDate = createMatchingFiscalYearStartDate(calendarDate);
  44
  45         return Days.daysBetween(fiscalYearStartDate, calendarDate).getDays() + 1;
  46     }
  47
  48     private LocalDate createMatchingFiscalYearStartDate(final LocalDate calendarDate) {
  49         if (fiscalYearStartMonth <= calendarDate.getMonthOfYear()) {
  50             return new LocalDate(calendarDate.getYear(), fiscalYearStartMonth, 1);
  51         }
  52
  53         return new LocalDate(calendarDate.getYear() - 1, fiscalYearStartMonth, 1);
  54     }
  55
  56     @Override
  57     public LocalDate calculateCalendarDate(final int fiscalYear, final int fiscalMonth, final int fiscalDay) {
  58         final int calendarYear = calculateCalendarYear(fiscalYear, fiscalMonth);
  59         final int calendarMonth = calculateCalendarMonth(fiscalMonth);
  60
  61         return new LocalDate(calendarYear, calendarMonth, fiscalDay);
  62     }
  63
  64     private final int calculateCalendarMonth(final int fiscalMonth) {
  65         return (fiscalMonth + fiscalYearStartMonth - 1) % 12;
  66     }
  67
  68     protected abstract int calculateCalendarYear(int fiscalYear, int fiscalMonth);
  69
  70 }