@SupportedAnnotationTypes({ "my.own.Annotations.*" })
@SupportedSourceVersion(SourceVersion.RELEASE_6)
public class GamaProcessor extends AbstractProcessor {

	public GamaProcessor() {}

	@Override
	public boolean process(final Set<? extends TypeElement> elements, final RoundEnvironment env) {
		Messager messager = processingEnv.getMessager();
		Filer filer = processingEnv.getFiler();
		FileObject file = null;
		Writer writer = null;
		StandardLocation location = StandardLocation.SOURCE_OUTPUT;
		try {
			file = filer.createResource(location, "", "classes.txt", new Element[] {});
		} catch (FilerException e2) {
			try {
				file = filer.getResource(location, "", "classes.txt");
			} catch (IOException e) {
				return true;
			}
		} catch (IOException e) {
			return true;
		}
		try {
			writer = file.openWriter();
		} catch (IOException e1) {
			return true;
		}

		final PrintWriter out = new PrintWriter(writer, true);
		out.println("BEGIN CLASSES LIST");
		for ( TypeElement annotation : elements ) {
			String aName = annotation.getSimpleName().toString();
			Set<? extends Element> types = env.getElementsAnnotatedWith(annotation);
			for ( Element element : types ) {
				if ( element.getKind() == ElementKind.CLASS ) {
					String msg = aName + " annotates " + element.getSimpleName().toString();
					out.println(msg);
					messager.printMessage(Kind.ERROR, msg, element);
				}
			}

		}
		out.println("END CLASSES LIST");
		out.close();

		return true;
	}
}