Enum inheritance

public enum SomeEnum {

    VAL_ONE("VAL_TWO", "VAL_FOUR"),
    VAL_TWO("VAL_FIVE"),
    VAL_THREE("VAL_FOUR"),
    VAL_FOUR(),
    VAL_FIVE("VAL_FOUR");

    private final List<String> children;

    private SomeEnum(String... children) {
        this.children = new ArrayList<>(children);
    }

     public Set<SomeEnum> getChildren(Set<SomeEnum> include) {
        Set<SomeEnum> back = new HashSet<>();
        back.addAll(include);
        for (String s : this.children) {
            SomeEnum val = SomeEnum.valueOf(s);
            back.add(val);
            back = this.getChildren(back);
        }
        return back;
    }

}


/*

   This would be called like so:

*/

SomeEnum.VAL_ONE.getChildren(null); //returns VAL_TWO and VAL_FOUR, and VAL_FIVE
SomeEnum.VAL_TWO.getChildren(null); //returns VAL_FIVE and VAL_FOUR
SomeEnum.VAL_THREE.getChildren(null); //returns VAL_FOUR
SomeEnum.VAL_FOUR.getChildren(null); //returns an empty set
SomeEnum.VAL_FIVE.getChildren(null); //returns VAL_FOUR