Java – annotation processor – how to get the class it is processing

I'm trying to write a custom annotation processor

public class AnnotationProcessor extends AbstractProcessor {
  ......
    @Override
     public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv) {

     Set<? extends Element> rootE=roundEnv.getRootElements();
       for(Element e: rootE) {
        if(e.getKind()==ElementKind.CLASS) {
            String className= e.getSimpleName().toString();
            processingEnv.getMessager().printMessage( javax.tools.Diagnostic.Kind.WARNING,className,e); 
        }
     }
}

Solution

You cannot access the class being processed by the annotation processor because the class has not been compiled Instead, Java provides a similar elements API for reflective checking of input sources

Element (found by using roundenv. Getrootelements()) has more information about the class being compiled, not just its name Using elementvisitors, you can find a lot of useful information:

http://docs.oracle.com/javase/6/docs/api/javax/lang/model/element/ElementVisitor.html http://docs.oracle.com/javase/6/docs/api/javax/lang/model/util/ElementKindVisitor6.html

Including class constructors, methods, fields, etc

Here's how to use it:

public class AnnotationProcessor extends AbstractProcessor {
......
    @Override
     public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv) {

         Set<? extends Element> rootE=roundEnv.getRootElements();
         for(Element e: rootE) {
             for(Element subElement : e.getEnclosedElements()){
                 subElement.accept(new ExampleVisitor(),null); // implement ExampleVisitor
             }
        }
    }
}