public Collection<JID> getAssociationTrusted() {
        return Collections.unmodifiableCollection(associationTrusted);
    }
Returns the users that are allowed to associate leaf nodes with this collection node.
This collection is going to be used only when the associationPolicy is {@code whitelist}.

@return the users that are allowed to associate leaf nodes with this collection node.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/CollectionNode.java