A way to associate code with an annotation

AnnotationsWithCode.java

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Member;

/**
 * @author peter.lawrey
 */
@Retention(RetentionPolicy.RUNTIME)
public @interface CustomAnnotation {
    public int value() default 0;
    
    enum HandlesAnnotation implements AnnotationHandler<CustomAnnotation> {
        INSTANCE;

        @Override
        public void process(Model model, Member member, CustomAnnotation ca) {
            // do something with a model based on the members details and the annotation state.
        }
    }
}