private static <T extends Enum> int[] toIntArray(Collection<T> collection) {
List<Integer> c = new ArrayList<Integer>(collection.size());
for (T t : collection) {
c.add(t.ordinal());
}
return ArrayUtils.toPrimitive(c.toArray(new Integer[c.size()]));
}
public static <T extends Enum> T toEnum(Class<T> cls, int value) {
T[] enumConstants = cls.getEnumConstants();
for (T e : enumConstants) {
if (e.ordinal() == value) {
return e;
}
}
return null;
}
public static <T extends Enum> T toEnumOrDie(Class<T> cls, int value) {
T[] enumConstants = cls.getEnumConstants();
for (T e : enumConstants) {
if (e.ordinal() == value) {
return e;
}
}
die("Can't convert ordinal value " + value + " into enum of type " + cls);
return null;
}