java annotation enum array default value

Question

I want to write an annotation that hast a EnumArray Field. Default value should be all values of the Enum. This code works but I don't want to specify every enum manually.

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface CommonScope
{
    ECountry[] countries() default {ECountry.AT, ECountry.DE};

}

I want to do something like this:

ECountry[] countries() default ECountry.values();

Can someone tell me how to achieve this?

Thank you

@KennethClark - How - I can't seem to make that work. n'or does EnumSet.allOf(A.class).toArray(). — OldCurmudgeon
– OldCurmudgeon, Commented Mar 4, 2015 at 9:51
Hm does not work. I get the same error when I Use values() ... Eclipse tells me "The value for annotation attribute CommonScope.countries must be an enum constant expression" — Klaus Ertl
– Klaus Ertl, Commented Mar 4, 2015 at 9:52
you tried public static ECountry[] COUNTRY = (EStatus[]) EnumSet.allOf(ECountry.class).toArray(); — Kenneth Clark
– Kenneth Clark, Commented Mar 4, 2015 at 10:37
This will add all the values , not sure is that's what you expected , if you want specific values .. Like just two countries but the enum contains 10 you will have to add a little more logic. — Kenneth Clark
– Kenneth Clark, Commented Mar 4, 2015 at 10:46

kapex · Accepted Answer · 2017-10-18 10:10:03Z

11

This is not possible, annotation declaration is very limited. You can not call any methods or use properties, you can only use compile time constant expressions, that are known at compile time by the compiler.

As a workaround, you could add a special enum value like Countries.ALL_COUNTRIES if that makes sense for your application.

edited Oct 18, 2017 at 10:10

answered Mar 4, 2015 at 10:49

kapex

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