void merge(EventSetDescriptor event) {
        super.merge(event);
        if (addListenerMethod == null) {
            addListenerMethod = event.addListenerMethod;
        }
        if (getListenerMethod == null) {
            getListenerMethod = event.getListenerMethod;
        }
        if (listenerMethodDescriptors == null) {
            listenerMethodDescriptors = event.listenerMethodDescriptors;
        }
        if (listenerMethods == null) {
            listenerMethods = event.listenerMethods;
        }
        if (listenerType == null) {
            listenerType = event.listenerType;
        }

        if (removeListenerMethod == null) {
            removeListenerMethod = event.removeListenerMethod;
        }
        inDefaultEventSet &= event.inDefaultEventSet;
    }