How to use

getAnnotations

method

in

com.google.gwt.core.ext.typeinfo.HasAnnotations

public static <T extends Annotation> T getAnnotation(HasAnnotations classType, Class<T> annotationType) {
  try {
    T ann = classType.getAnnotation(annotationType);
    if (ann == null) {
      for (Annotation metaAnn : classType.getAnnotations()) {
        // only return a custom annotation if it contains the JacksonAnnotationsInside annotation
        if (metaAnn.annotationType().getAnnotation(JacksonAnnotationsInside.class) != null) {
          ann = metaAnn.annotationType().getAnnotation(annotationType);
          if (ann != null) {
            break;
          }
        }
      }
    }
    return ann;
  } catch (Exception ex) {
    return null;
  }
}

/**
 * Overloaded version to check GWT's JClassType classes.
 *
 * @param type
 * @param hasAnnotations
 *
 * @return
 */
public boolean isElementType(final WiringElementType type,
               final com.google.gwt.core.ext.typeinfo.HasAnnotations hasAnnotations) {
 final Collection<Class<? extends Annotation>> annotationsForElementType = getAnnotationsForElementType(type);
 for (final Annotation a : hasAnnotations.getAnnotations()) {
  if (annotationsForElementType.contains(a.annotationType())) {
   return true;
  }
 }
 return false;
}

public static <T extends Annotation> T getAnnotation(HasAnnotations classType, Class<T> annotationType) {
  try {
    T ann = classType.getAnnotation(annotationType);
    if (ann == null) {
      for (Annotation metaAnn : classType.getAnnotations()) {
        // only return a custom annotation if it contains the JacksonAnnotationsInside annotation
        if (metaAnn.annotationType().getAnnotation(JacksonAnnotationsInside.class) != null) {
          ann = metaAnn.annotationType().getAnnotation(annotationType);
          if (ann != null) {
            break;
          }
        }
      }
    }
    return ann;
  } catch (Exception ex) {
    return null;
  }
}

public static Annotation[] extractAnnotations(int annotationRetention,
  HasAnnotations method) {
 ArrayList<Annotation> annos = new ArrayList<Annotation>();
 boolean keepClass = (annotationRetention | ReflectionStrategy.COMPILE) == annotationRetention;
 boolean keepRuntime = (annotationRetention | ReflectionStrategy.RUNTIME) == annotationRetention;
 for (Annotation anno : method.getAnnotations()) {
  Retention retention = anno.annotationType().getAnnotation(Retention.class);
  if (retention == null) {
   if (keepClass)
    annos.add(anno);
  } else {
   switch (retention.value()) {
    case CLASS:
     if (keepClass)
      annos.add(anno);
     break;
    case RUNTIME:
     if (keepRuntime)
      annos.add(anno);
    default:
   }
  }
 }
 return annos.toArray(new Annotation[annos.size()]);
}