private DiscoItemsProvider getProvider(String name) {
        return entities.get(name);
    }
Returns the DiscoItemsProvider responsible for providing the items related to a given entity
or null if none was found.

@param name the name of the identity.
@return the DiscoItemsProvider responsible for providing the items related to a given entity
        or null if none was found.
xmppserver/src/main/java/org/jivesoftware/openfire/disco/IQDiscoItemsHandler.java