Annotation with multiple parameters with conditional default value

Question

I'm creating a custom annotation named @Skip as shown below.

@Retention (RetentionPolicy.RUNTIME)
@Target ({ElementType.TYPE, ElementType.METHOD})
@Inherited
public @interface Skip {
    public String comment() default "";
    public String bug() default "";
}

Is it possible to set conditional default value on the comment and bug? What I'm trying to achieve is, if comment is provided, bug must be optional, if bug is provided comment is optional. I can do this check at run-time, but I want to find out if we can do it at compile time. This way, eclipse will show a compilation error if at least one of these is not provided by the developer.

Puce · Accepted Answer · 2014-08-12 13:54:37Z

1

You could check these things at compilation time using an annotation processor.

Have a look at the Javadoc for a starting point.

If you package the processor in the same jar as the annotation and register the processor as a service, it will be exucted automagically when compiling an annotated class (must be in a different jar).

edited Aug 12, 2014 at 13:54

answered Aug 12, 2014 at 13:39

Puce

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2 Comments

Buddha Over a year ago

Never heard of annotation processor. I will try to find out what they are and how to use them.

Puce Over a year ago

@Buddha I added some additional information to my answer.

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