EDIT August 2018
Today I would implement this as follows
public enum LegNo {
NO_LEG(-1), LEG_ONE(1), LEG_TWO(2);
private final int value;
LegNo(int value) {
this.value = value;
}
public static Optional<LegNo> valueOf(int value) {
return Arrays.stream(values())
.filter(legNo -> legNo.value == value)
.findFirst();
}
}
You’ll have to maintain a mapping inside the enum.
public enum LegNo {
NO_LEG(-1), LEG_ONE(1), LEG_TWO(2);
private int legNo;
private static Map<Integer, LegNo> map = new HashMap<Integer, LegNo>();
static {
for (LegNo legEnum : LegNo.values()) {
map.put(legEnum.legNo, legEnum);
}
}
private LegNo(final int leg) { legNo = leg; }
public static LegNo valueOf(int legNo) {
return map.get(legNo);
}
}
The static block will be invoked only once, so there is practically no performance issue here.
EDIT: Renamed the method to valueOf
as it is more inline with other Java classes.