/**
* Returns {@code true} if the given key has already been registered. This is used to prevent
* reentrant metadata registration (and cycles).
*/
public boolean isRegistered(ElementKey<?, ?> key) {
RootKey rootKey = Schema.getRootKey(key);
ElementMetadataRegistryBuilder elementRegistry = elements.get(rootKey);
if (elementRegistry != null) {
return elementRegistry.isRegistered(null, key, null);
}
return false;
}
