Check class hierarchy when compiling on annotation processor

Chilo

I am writing an annotation processor to perform the following checks at compile time:

  • has an interfaceE
  • There is an @Applyannotation for annotating methods.
  • Annotated methods @Applyshould be called applyand take only one parameter of the implementing classE

So far I have identified all the annotated methods applyand extracted the names of the classes they take as parameters. So I am left with:

 Element method  // this is the Element that represents the `apply` method
 TypeMirror mirror //method's TypeMirror
 String paramClass // the parameter's class Name.

The question is: how (if at all) how to get rid of the class hierarchy representation of these parameters so that their implementation can be checked E. This won't work since the class doesn't ClassLoader.loadClassexist yet , but I just need the class hierarchy.

Chilo

The way to use the javax.lang.model.util.Types.isSubtype()method is simple :

 TypeMirror parameterTypes = mirror.getParameterTypes();
 TypeMirror typeOfE = processingEnv.getElementUtils().getTypeElement(E.class.getName()).asType();
 boolean isSubTypeOfE = processingEnv.getTypeUtils().isSubtype(parameterType, eventType)

This way I can check if the parameter class of the represented method mirroris a subtype of the desired typeE

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