private void calculate() {
DateHolder dateHolder = new DateHolder(cal, DatePrecision.DAY);
year = dateHolder.getYear();
month = dateHolder.getMonth();
dateHolder.setBeginOfMonth();
begin = dateHolder.getDate(); // Storing begin of month.
dateHolder.setEndOfMonth();
end = dateHolder.getDate(); // Storing end of month.
dateHolder.setDate(begin); // reset to begin of month
dateHolder.computeTime();
dateHolder.setBeginOfWeek(); // get first week (with days of previous month)
weeks = new ArrayList<WeekHolder>();
do {
WeekHolder week = new WeekHolder(dateHolder.getCalendar(), month);
weeks.add(week);
dateHolder.add(Calendar.WEEK_OF_YEAR, 1);
} while (dateHolder.getMonth() == month);
}
/**
* Sets the date to the beginning of the year (first day of year) and calls setBeginOfDay.
*
* @see #setBeginOfDay()
*/
public DateHolder setBeginOfYear() {
calendar.set(Calendar.MONTH, Calendar.JANUARY);
setBeginOfMonth();
return this;
}