private static <R> Holder<R> findHolder(R referent) {
if (referent == null) {
// AbstractBuild.NONE
return new DefaultHolderFactory.NoHolder<R>();
}
for (HolderFactory f : ExtensionList.lookup(HolderFactory.class)) {
Holder<R> h = f.make(referent);
if (h != null) {
LOGGER.log(
Level.FINE, "created build reference for {0} using {1}", new Object[] {referent, f});
return h;
}
}
return new DefaultHolderFactory().make(referent);
}
