if ( attributeNodeMap == null ) {
attributeNodeMap = new HashMap<String, AttributeNodeImplementor<?>>();
}
else {
final AttributeNode old = attributeNodeMap.get( attributeNode.getRegistrationName() );
if ( old != null ) {
log.debugf(
"Encountered request to add entity graph node [%s] using a name [%s] under which another " +
"node is already registered [%s]",
old.getClass().getName(),
attributeNode.getRegistrationName(),
attributeNode.getClass().getName()
);
}
}