Ето примерно решение, тенденциозно доближено до основната функционалност на
enum:

public class ExtensibleEnum {

private java.util.Map<String, Enum> mValues = new
java.util.LinkedHashMap<String,
Enum>();

public ExtensibleEnum(final Enum[] ... pEnums) {
for (final Enum[] iEnum : pEnums) {
for (final Enum e : iEnum) {
if (mValues.put(e.name(), e) != null) {
throw new RuntimeException(e.name() + " already exists.");
}
}
}
}

public Enum get(final String pName) {
return mValues.get(pName);
}

public Enum[] values() {
return mValues.values().toArray(new Enum[mValues.size()]);
}

public Enum valueOf(final Class pEnumType, final String pName) {
final Enum ret = get(pName);

if (! ret.getClass().equals(pEnumType)) {
throw new IllegalArgumentException();
}

return ret;
}
}

Ето как бих направил две псевдо изброявания на числата от 1 до 19 и от 1 до 29:

public class ExtensibleEnumDemo {

enum E1_9 {
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE
}

enum E10_19 {
TEN, ELEVEN, TWELVE, THIRTEEN, FOURTEEN, FIFTEEN, SIXTEEN, SEVENTEEN,
EIGHTEEN,
NINETEEN
}

enum E20_29 {
TWENTY, TWENTYONE, TWENTYTWO, TWENTYTHREE, TWENTYFOUR, TWENTYFIVE, TWENTYSIX,
TWENTYSEVEN, TWENTYEIGHT, TWENTYNINE
}

static class E1_19 {
private final static ExtensibleEnum smTheEnum = new
ExtensibleEnum(E1_9.values(),
E10_19.values());

public static Enum[] values() {
return smTheEnum.values();
}
}

static class E1_29 {
private final static ExtensibleEnum smTheEnum = new
ExtensibleEnum(E1_9.values(),
E10_19.values(), E20_29.values());

public static Enum[] values() {
return smTheEnum.values();
}

public static Enum valueOf(final Class pEnumType, final String pName) {
return smTheEnum.valueOf(pEnumType, pName);
}
}

public static void main(String[] args) {
demo(E1_9.values());
demo(E10_19.values());
demo(E20_29.values());
demo(E1_19.values());
demo(E1_29.values());

System.out.println(E1_29.valueOf(E10_19.class, E10_19.NINETEEN.name()));
System.out.println(E1_29.valueOf(E1_19.class, E10_19.NINETEEN.name())); //
Error
}

static void demo(final Enum[] pEnum) {
for (final Enum e : pEnum) {
System.out.println(e + ", name()=" + e.name() + ", ordinal()=" +
e.ordinal());
}

System.out.println("--------------------------------------");
}
}


Vladislav Doshev (VladiSD)
ICQ #16292897



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