FormEventManager.java 文件源码

/**
 * Subscribes given component to given identifier. If there are no subscriptions
 * yet for this identifier, an entry in the subscriptions map is created.
 *
 * @param formComponent the component to subscribe.
 * @param identifier    the identifier the given component should be
 *                      subscribed to.
 */
private void subscribeComponentToIdentifier(AbstractFormComponent formComponent,
                                            String identifier) {
    if (hasSubscriptionsForIdentifier(identifier)) {
        subscriptions.get(identifier).add(formComponent);
    } else {
        HashSet<AbstractFormComponent> subscribedComponents =
                new OrderedHashSet<AbstractFormComponent>();
        subscribedComponents.add(formComponent);
        subscriptions.put(identifier, subscribedComponents);
    }
}