/*
* Copyright 2013 Guidewire Software, Inc.
*/
package gw.date;
/**
* Enumeration of months, January, February and so on, with utilities for converting to and from the
* integer constants used by {@link java.util.Calendar}.
*/
public enum Month {
JANUARY,
FEBRUARY,
MARCH,
APRIL,
MAY,
JUNE,
JULY,
AUGUST,
SEPTEMBER,
OCTOBER,
NOVEMBER,
DECEMBER;
/**
* The implementation of the functions to convert to and from calendar values assume that neither the
* values in java.util.Calendar nor the order of constants in this enumeration will ever change. The
* _valueLookup array is just a private cache of the enumeration value array to avoid allocating a
* new one every time we do a lookup.
*/
private static final Month[] _valueLookup = values();
/**
* Convert an integer constant as used by the {@link java.util.Calendar#MONTH} field into the
* corresponding member of this enumeration.
* @param calendarMonth an integer constant in the range 0-11
* @return the corresponding enumeration member
* @throws IllegalArgumentException if the given integer is not in the correct range
*/
public static Month fromCalendarMonth(int calendarMonth) {
if (calendarMonth < 0 || calendarMonth >= _valueLookup.length) {
throw new IllegalArgumentException(calendarMonth + " is not a valid Calendar month");
}
return _valueLookup[calendarMonth];
}
/**
* The corresponding integer constant suitable for use with the {@link java.util.Calendar#MONTH} field
* @return integer in the range 0-11
*/
public int toCalendarMonth() {
return ordinal();
}
}