private JsonArrayNodeBuilder getHolidayInRegion(Date begin, Date end, Region region) { JsonArrayNodeBuilder builder = anArrayBuilder(); List<Holiday> holidays = calendarService.getHolidaysOnlyForRegion(begin, end, region); for (Holiday holiday : holidays) { builder.withElement( aStringBuilder(dateToString(holiday.getCalDate().getCalDate(), VIEW_DATE_PATTERN))); } return builder; }