/**
* Returns required attachment value from deployment unit.
*
* @param <A> expected value
* @param unit deployment unit
* @param key attachment key
* @return required attachment
* @throws IllegalStateException if attachment value is null
*/
public static <A> A getRequiredAttachment(final DeploymentUnit unit, final AttachmentKey<A> key) {
final A value = unit.getAttachment(key);
if (value == null) {
ASHelper.LOGGER.error("Cannot find attachment in deployment unit: " + key);
throw new IllegalStateException();
}
return value;
}
