Here are 2 new examples:
1) I found out that most of the time the name() of the enum is not what I need. I need it to map an XML or HTML tag, an external ID, an entry name in excel or simple type name in a JSON object. So I write something like:
public enum ConfigName {
ALL("local-all"),
INTERNAL("local-int"),
OR("local-int-ext");
private final String xmlKey;
LdapConfig(String xmlKey) {
this.xmlKey = xmlKey;
}
public String getXmlKey() {
return xmlKey;
}
}
I could remove the getter, and the IDE helping a lot writing the boiler plate code but why? Here is how it should look:
public enum ConfigName extends AlternateEnumKey {
ALL("local-all"),
INTERNAL("local-int"),
OR("local-int-ext");
}
The extra feature here is that the name() of the enum (ALL, INTERNAL, OR) is a constant that is not recognized as such by the javac compiler. So:
@XmlTag(tag = ConfigName.ALL)
will not compile and so:
@XmlTag(tag = ConfigName.ALL.xmlKey)
will for sure not.
But with extended enum you'll have:
public @interface XmlTag { AlternateEnumKey tag(); }
// The framework managing XmlTag will take the alternate key value
@XmlTag(tag = ConfigName.ALL)
2) Since extended enums also supports generics for enums, and I just have this issue associating also a long (ID) to an enums, you can now write:
public enum ConfigName extends EnumPairExtension<Long, String> {
ALL(45L, "local-all"),
INTERNAL(56L, "local-int"),
OR(98L, "local-int-ext");
}
assert ConfigName.OR.a == 98L;
With this, parsing definitions are a lot cleaner to write.
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