AbstractProcessor, how to claim for annotations which target is another annotation?


Given this annotation:

@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.ANNOTATION_TYPE) public @interface Interceptor { Class<? extends Behaviour> value(); }

The users of my library can extend its API creating custom annotations annotated with @Interceptor, as follows:

@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) @Interceptor(BypassInterceptor.class) public @interface Bypass { }

<a href="https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/AbstractProcessor.html" rel="nofollow">AbstractProcessor</a> provides a method called <a href="https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/AbstractProcessor.html#getSupportedSourceVersion()" rel="nofollow">getSupportedAnnotationTypes</a> which returns the names of the annotation types supported by the processor. But if I specify the name of @Interceptor, as follows:

@Override public Set<String> getSupportedAnnotationTypes() { Set<String> annotations = new LinkedHashSet(); annotations.add(Interceptor.class.getCanonicalName()); return annotations; }

The <a href="https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/AbstractProcessor.html#process(java.util.Set,%20javax.annotation.processing.RoundEnvironment)" rel="nofollow">processor#process</a> method will not be notified when a class is annotated with @Bypass annotation.

So, when using an AbstractProcessor, how to claim for annotations which target is another annotation?


If your annotation processor is scanning for all annotations that are meta-annotated with your annotation, you'll need to specify "*" for your supported annotation types, and then inspect each annotation's declaration (using ProcessingEnvironment.getElements() to determine whether it has the meta-annotation of interest.


You should use the @SupportedAnnotationTypes annotation on your processor, and not override the getSupportedAnnotationTypes() method, for example:

@SupportedAnnotationTypes({"com.test.Interceptor"}) public class AnnotationProcessor extends AbstractProcessor { ... <blockquote>

The Processor.getSupportedAnnotationTypes() method can construct its result from the value of this annotation, as done by AbstractProcessor.getSupportedAnnotationTypes().



<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/processing/SupportedAnnotationTypes.html" rel="nofollow">https://docs.oracle.com/javase/8/docs/api/javax/annotation/processing/SupportedAnnotationTypes.html</a>


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